ANALOG DEVICES ADRF6602 Service Manual

1550 MHz to 2150 MHz Rx Mixer with

Integrated Fractional-N PLL and VCO

FEATURES

Rx mixer with integrated fractional-N PLL RF input frequency range: 1000 MHz to 3100 MHz Internal LO frequency range: 1550 MHz to 2150 MHz Input P1dB: 14.8 dBm Input IP3: 30 dBm IIP3 optimization via external pin SSB noise figure

IP3SET pin open: 13.8 dB

IP3SET pin at 3.3 V: 15 dB Voltage conversion gain: 6.5 dB Matched 200 Ω IF output impedance IF 3 dB bandwidth: 500 MHz Programmable via 3-wire SPI interface 40-lead, 6 mm × 6 mm LFCSP

APPLICATIONS

Cellular base stations

GENERAL DESCRIPTION

The ADRF6602 is a high dynamic range active mixer with integrated phase-locked loop (PLL) and voltage controlled oscillator (VCO). The PLL/synthesizer uses a fractional-N PLL to generate a f can be divided or multiplied and then applied to the PLL phase frequency detector (PFD).

LODRV_EN

input to the mixer. The reference input

CC1

LON

LOP

PLL_EN

DATA

CLK

REF_IN

MUXOUT

12 13 14

SPI

INTERFACE

×2

MUX

÷2 ÷4

FRACTION

TEMP

SENSOR

7 11 15 20 21 23 24 25 28 30 31 35

FUNCTIONAL BLOCK DIAGRAM

CC2VCC_LOVCC_MIXVCC_V2IVCC_LO

MODULUS

REG

THIRD-ORDER

FRACTIONAL

INTERPOLATOR

– +

N COUNTER

PHASE

FREQUENCY

DETECTOR

GND

INTEGER

REG

21 TO 123

Figure 1.

ADRF6602

The PLL can support input reference frequencies from 12 MHz to 160 MHz. The PFD output controls a charge pump whose output drives an off-chip loop filter.

The loop filter output is then applied to an integrated VCO. The VCO output at 2× f programmable PLL divider. The programmable PLL divider is controlled by a Σ- modulator (SDM). The modulus of the SDM can be programmed from 1 to 2047.

The active mixer converts the single-ended 50  RF input to a 200 Ω differential IF output. The IF output can operate up to 500 MHz.

The ADRF6602 is fabricated using an advanced silicon-germanium BiCMOS process. It is available in a 40-lead, RoHS-compliant, 6 mm × 6 mm LFCSP with an exposed paddle. Performance is specified over the −40°C to +85°C temperature range.

Table 1.

Internal LO

Part No.

Range

ADRF6601 750 MHz 300 MHz 450 MHz

1160 MHz 2500 MHz 1600 MHz

ADRF6602 1550 MHz 1000 MHz 1350 MHz

2150 MHz 3100 MHz 2750 MHz

ADRF6603 2100 MHz 1100 MHz 1450 MHz

2600 MHz 3200 MHz 2850 MHz

ADRF6604 2500 MHz 1200 MHz 1600 MHz

2900 MHz 3600 MHz 3200 MHz

2717101 22

BUFFER

PRESCALER

÷2

CHARGE PUMP 250µA, 500µA (DEFAUL T ) ,

750µA, 1000µA

SET

is applied to an LO divider, as well as to a

±3 dB RF Balun Range

ADRF6602

INTERNAL L O RANGE 1550MHz TO 2150MHz

DIV

2:1

MUX

2, 1

VCO

CORE

CP VTUNE

IFP

191839

IFN

32 33

3.3V LDO

2.5V LDO

VCO LDO

±1 dB RFIN Balun Range

DECL3P3

DECL2P5

DECLVCO

IP3SET

08545-001

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

ADRF6602

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

RF Specifications .......................................................................... 3

Synthesizer/PLL Specifications ................................................... 4

Logic Input and Power Specifications ....................................... 4

Timing Characteristics ................................................................ 5

Absolute Maximum Ratings ............................................................ 6

ESD Caution .................................................................................. 6

Pin Configuration and Function Descriptions ............................. 7

Typical Performance Characteristics ............................................. 9

RF Frequency Sweep .................................................................... 9

IF Frequency Sweep ................................................................... 10

Spurious Performance................................................................ 15

0x10000B) .................................................................................... 17

Control (Default: 0x0AA7E4) ................................................... 18

0x0000E5) .................................................................................... 19

0x1E2106) .................................................................................... 19

(Default: 0x000007) .................................................................... 19

Theory of Operation ...................................................................... 20

Programming the ADRF6602 ................................................... 20

Initialization Sequence .............................................................. 20

LO Selection Logic ..................................................................... 21

Applications Information .............................................................. 22

Basic Connections for Operation ............................................. 22

AC Test Fixture ............................................................................... 23

Evaluation Board ............................................................................ 24

Evaluation Board Control Software ......................................... 24

Schematic and Artwork ............................................................. 26

Evaluation Board Configuration Options ............................... 28

Outline Dimensions ....................................................................... 29

Ordering Guide .......................................................................... 29

REVISION HISTORY

9/10—Rev. B to Rev. C

Changes to Features Section............................................................ 1

Changes to Table 2 ............................................................................ 3

Changes to Table 3 and Table 4 ....................................................... 4

Changes to Table 6 ............................................................................ 6

Changes to Typical Performance Characteristics Section ........... 9

Added Spurious Performance Section ......................................... 15

Changes to Programming the ADRF6602 Section .................... 20

Added AC Test Fixture Section and Figure 47 ........................... 23

Changes to Evaluation Board Control Software Section ........... 24

7/10—Rev. A to Rev. B

Changes to Table 1 ............................................................................ 1

Changes to Table 6 ............................................................................ 6

Changes to Figure 20 ...................................................................... 14

Changes to Figure 21 ...................................................................... 17

Changes to Figure 22 ...................................................................... 18

Changes to Figure 23 ...................................................................... 19

Rev. C | Page 2 of 32

4/10—Rev. 0 to Rev. A

Added Table 1 .................................................................................... 1

Changes to Figure 1 ........................................................................... 1

Change to Synthesizer/PLL Specifications Section ....................... 4

Change to Table 3 .............................................................................. 4

Changes to Initializing Sequence Section ................................... 15

Changes to Figure 16 ...................................................................... 12

Changes to Figure 17 ...................................................................... 13

Changes to Figure 19 ...................................................................... 14

Changes to Figure 21 ...................................................................... 17

Changes to Figure 24 ...................................................................... 20

1/10—Revision 0: Initial Version

ADRF6602

SPECIFICATIONS

RF SPECIFICATIONS

VS = 5 V; ambient temperature (TA) = 25°C; f using CDAC (0x0) and IP3SET (3.3 V), unless otherwise noted.

Table 2.

Parameter Test Conditions/Comments Min Typ Max Unit

INTERNAL LO FREQUENCY RANGE 1550 2150 MHz RF INPUT FREQUENCY RANGE ±3 dB RF input range 1000 3100 MHz RF INPUT AT 1410 MHz

Input Return Loss Relative to 50 Ω (can be improved with external match) −9 dB

Input P1dB 15.5 dBm

Second-Order Intercept (IIP2) −5 dBm each tone (10 MHz spacing between tones) 54.0 dBm

Third-Order Intercept (IIP3) −5 dBm each tone (10 MHz spacing between tones) 33.5 dBm

Single-Side Band Noise Figure IP3SET = 3.3 V 15.2 dB

IP3SET = open 14.1 dB

LO-to-IF Leakage At 1× LO frequency, 50 Ω termination at the RF port −45 dBm

RF INPUT AT 1760 MHz

Input Return Loss Relative to 50 Ω (can be improved with external match) −15 dB

Input P1dB 15 dBm

Second-Order Intercept (IIP2) −5 dBm each tone (10 MHz spacing between tones) 53.5 dBm

Third-Order Intercept (IIP3) −5 dBm each tone (10 MHz spacing between tones) 30.8 dBm

Single-Side Band Noise Figure IP3SET = 3.3 V 14.9 dB

IP3SET = open 13.5 dB

LO-to-IF Leakage At 1× LO frequency, 50 Ω termination at the RF port −43 dBm

RF INPUT AT 2010 MHz

Input Return Loss Relative to 50 Ω (can be improved with external match) <(−20) dB

Input P1dB 14.8 dBm

Second-Order Intercept (IIP2) −5 dBm each tone (10 MHz spacing between tones) 60 dBm

Third-Order Intercept (IIP3) −5 dBm each tone (10 MHz spacing between tones) 29.5 dBm

Single-Side Band Noise Figure IP3SET = 3.3 V 15.8 dB

IP3SET = open 14.9 dB

LO-to-IF Leakage At 1× LO frequency, 50 Ω termination at the RF port −45 dBm

IF OUTPUT

Voltage Conversion Gain Differential 200 Ω load 6.5 dB

IF Bandwidth Small signal 3 dB bandwidth 500 MHz

Output Common-Mode Voltage External pull-up balun or inductors required 5 V

Gain Flatness Over frequency range, any 5 MHz/50 MHz 0.2/0.5 dB

Gain Variation Over full temperature range 1.2 dB

Output Swing Differential 200 Ω load 2 V p-p

Differential Output Return Loss Measured through 4:1 balun −12 dB

LO INPUT/OUTPUT (LOP, LON) Externally applied 1× LO input, internal PLL disabled

Frequency Range 250 6000 MHz

Output Level (LO as Output) 1× LO into a 50 Ω load, LO output buffer enabled −7 dBm

Input Level (LO as Input) −6 0 +6 dBm

Input Impedance 50 Ω

= 153.6 MHz; f

REF

= 38.4 MHz; high-side LO injection; fIF = 140 MHz; IIP3 optimized

PFD

Rev. C | Page 3 of 32

ADRF6602

SYNTHESIZER/PLL SPECIFICATIONS

VS = 5 V; ambient temperature (TA) = 25°C; f

= 140 MHz; IIP3 optimized using CDAC (0x0) and IP3SET (3.3 V), unless otherwise noted.

Table 3.

Parameter Test Conditions/Comments Min Typ Max Unit

SYNTHESIZER SPECIFICATIONS Synthesizer specifications referenced to 1× LO

Frequency Range Internally generated LO 1550 2150 MHz Figure of Merit1 P

Reference Spurs f f f

PFD

>f PHASE NOISE fLO = 1550 MHz to 2150 MHz, f

1 kHz to 10 kHz offset −92 dBc/Hz

100 kHz offset −103 dBc/Hz

500 kHz offset −122 dBc/Hz

1 MHz offset −128 dBc/Hz

5 MHz offset −140 dBc/Hz

10 MHz offset −147 dBc/Hz

20 MHz offset −150 dBc/Hz

Integrated Phase Noise 1 kHz to 40 MHz integration bandwidth 0.3

PFD Frequency 20 40 MHz REFERENCE CHARACTERISTICS REF_IN, MUXOUT pins

REF_IN Input Frequency 12 160 MHz

REF_IN Input Capacitance 4 pF

MUXOUT Output Level VOL (lock detect output selected) 0.25 V

MUXOUT Duty Cycle 50 % CHARGE PUMP

Pump Current Programmable to 250 μA, 500 μA, 750 μA, 1 mA 500 μA

Output Compliance Range 1 2.8 V

The figure of merit (FOM) is computed as phase noise (dBc/Hz) – 10Log10(f

power = 10 dBm (500 V/μs slew rate) with a 40 MHz f

REF

LOGIC INPUT AND POWER SPECIFICATIONS

VS = 5 V; ambient temperature (TA) = 25°C; f using CDAC (0x0) and IP3SET (3.3 V), unless otherwise noted.

= 153.6 MHz; f

REF

= 0 dBm −220.5 dBc/Hz

REF_IN

power = 4 dBm; f

REF

= 38.4 MHz; high-side LO injection;

PFD

= 38.4 MHz /4 −105 dBc

−80 dBc

PFD

= 38.4 MHz

PFD

°rms

(lock detect output selected) 2.7 V

) – 20Log10(fLO/f

. The FOM was computed at 50 kHz offset.

PFD

= 153.6 MHz; f

REF

PFD

= 38.4 MHz; high-side LO injection; fIF = 140 MHz; IIP3 optimized

PFD

). The FOM was measured across the full LO range, with f

PFD

= 80 MHz,

REF

Table 4.

Parameter Test Conditions/Comments Min Typ Max Unit

LOGIC INPUTS CLK, DATA, LE

Input High Voltage, V

Input Low Voltage, V

Input Current, I

1.4 3.3 V

INH

0 0.7 V

INL

0.1 μA

INH/IINL

Input Capacitance, CIN 5 pF POWER SUPPLIES VCC1, VCC2, VCC_LO, VCC_MIX, and VCC_V2I pins

Voltage Range 4.75 5 5.25 V

Supply Current PLL only 97 mA External LO mode (internal PLL disabled, LO output buffer off, IP3SET pin = 3.3 V) 168 mA Internal LO mode (internal PLL enabled, IP3SET pin = 3.3 V, LO output buffer on) 277 mA Internal LO mode (internal PLL enabled, IP3SET pin = 3.3 V, LO output buffer off) 263 mA Power-down mode 30 mA

Rev. C | Page 4 of 32

ADRF6602

TIMING CHARACTERISTICS

VCC2 = 5 V ± 5%.

Table 5.

Parameter Limit Unit Description

t1 20 ns min LE setup time t2 10 ns min DATA-to-CLK setup time t3 10 ns min DATA-to-CLK hold time t4 25 ns min CLK high duration t5 25 ns min CLK low duration t6 10 ns min CLK-to-LE setup time t7 20 ns min LE pulse width

Timing Diagram

CLK

DATA

DB23 (MSB) DB22

DB2 DB1

(CONTROL BIT C2)(CONTROLBIT C3)

DB0 (LSB)

(CONTROLBIT C1)

08545-002

Figure 2. Timing Diagram

Rev. C | Page 5 of 32

ADRF6602

ABSOLUTE MAXIMUM RATINGS

Table 6.

Parameter Rating

Supply Voltage, VCC1, VCC2, VCC_LO,

VCC_MIX, VCC_V2I Digital I/O, CLK, DATA, LE −0.3 V to +3.6 V IFP, IFN −0.3 V to VCC_V2I + 0.3 V RFIN 16 dBm LOP, LON 13 dBm θJA (Exposed Paddle Soldered Down) 35°C/W Maximum Junction Temperature 150°C Operating Temperature Range −40°C to +85°C Storage Temperature Range −65°C to +150°C

−0.5 V to +5.5 V

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ESD CAUTION

Rev. C | Page 6 of 32

ADRF6602

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

DRV_EN

CC_LO

LON

LOP

VTUNE

DECLVCO

PIN 1

1VCC1

INDICATOR

2DECL3P3

3CP

GND

SET

REF_IN

6 7

GND

MUXOUT

VCC2

DECL2P5

NOTES

1. NC = NO CONNECT.

2. THE EXPOSED PADDLE SHOULD BE SOLDEREDTO A LOW I M P EDANCE GROUND PLANE.

ADRF6602

TOP VIEW

(Not to S cale)

14 LE

CLK

GND

DATA

Figure 3. Pin Configuration

GND

NC 32

30 GND 29 IP3SET 28 GND 27 VCC_V2I

GND 24 GND 23 GND 22 VCC_MIX 21

GND

IFP

IFN

GND

PLL_EN

VCC_LO

08545-003

Table 7. Pin Function Descriptions

Pin No. Mnemonic Description

1 VCC1

Power Supply for the 3.3 V LDO. Power supply voltage range is 4.75 V to 5.25 V. Each power supply pin

should be decoupled with a 100 pF capacitor and a 0.1 μF capacitor located close to the pin. 2 DECL3P3 Decoupling Node for 3.3 V LDO. Connect a 0.1 μF capacitor between this pin and ground. 3 CP Charge Pump Output Pin. Connect to VTUNE through loop filter. 4, 7, 11, 15, 20,

GND Ground. Connect these pins to a low impedance ground plane. 21, 23, 24, 25, 28, 30, 31, 35

5 R

SET

Charge Pump Current. The nominal charge pump current can be set to 250 μA, 500 μA, 750 μA, or 1 mA using Bit DB11 and Bit DB10 in Register 4 and by setting Bit DB18 in Register 4 to 0 (internal reference current). In this mode, no external R

is required. If Bit DB18 is set to 1, the four nominal charge pump currents (I

SET

can be externally adjusted according to the following equation:

4.217

⎛ ⎜

SET

⎜

NOMINAL

⎝

⎞

⎟ ⎟ ⎠

37.8

−

6 REF_IN Reference Input. Nominal input level is 1 V p-p. Input range is 12 MHz to 160 MHz. 8 MUXOUT

Multiplexer Output. This output can be programmed to provide the reference output signal or the lock detect

signal. The output is selected by programming the appropriate register. 9 DECL2P5 Decoupling Node for 2.5 V LDO. Connect a 0.1 μF capacitor between this pin and ground. 10 VCC2

Power Supply for the 2.5 V LDO. Power supply voltage range is 4.75 V to 5.25 V. Each power supply pin

should be decoupled with a 100 pF capacitor and a 0.1 μF capacitor located close to the pin. 12 DATA Serial Data Input. The serial data input is loaded MSB first; the three LSBs are the control bits. 13 CLK

Serial Clock Input. The serial clock input is used to clock in the serial data to the registers. The data is latched

into the 24-bit shift register on the CLK rising edge. Maximum clock frequency is 20 MHz. 14 LE

Load Enable. When the LE input pin goes high, the data stored in the shift registers is loaded into one of the

eight registers. The relevant latch is selected by the three control bits of the 24-bit word. 16 PLL_EN

PLL Enable. Switch between internal PLL and external LO input. When this pin is logic high, the mixer LO is

automatically switched to the internal PLL and the internal PLL is powered up. When this pin is logic low, the

internal PLL is powered down and the external LO input is routed to the mixer LO inputs. The SPI can also be

used to switch modes. 17, 34 VCC_LO

Power Supply. Power supply voltage range is 4.75 V to 5.25 V. Each power supply pin should be decoupled

with a 100 pF capacitor and a 0.1 μF capacitor located close to the pin. 18, 19 IFP, IFN Mixer IF Outputs. These outputs should be pulled to VCC with RF chokes.

NOMINAL

)

Rev. C | Page 7 of 32

ADRF6602

Pin No. Mnemonic Description

22 VCC_MIX

26 RFIN RF Input (Single-Ended, 50 Ω). 27 VCC_V2I

29 IP3SET Connect a resistor from this pin to a 5 V supply to adjust IIP3. Normally leave open. 32, 33 NC No Connection. 36 LODRV_EN

37, 38 LON, LOP

39 VTUNE

40 DECLVCO Decoupling Node for VCO LDO. Connect a 100 pF capacitor and a 10 μF capacitor between this pin and ground. EPAD Exposed Paddle. The exposed paddle should be soldered to a low impedance ground plane.

Power Supply. Power supply voltage range is 4.75 V to 5.25 V. Each power supply pin should be decoupled with a 100 pF capacitor and a 0.1 μF capacitor located close to the pin.

LO Driver Enable. Together with Pin 16 (PLL_EN), this digital input pin determines whether the LOP and LON pins operate as inputs or outputs. LOP and LON become inputs if the PLL_EN pin is low or if the PLL_EN pin is set high with the PLEN bit (DB6 in Register 5) set to 0. LOP and LON become outputs if either the LODRV_EN pin or the LDRV bit (DB3 in Register 5) is set to 1 while the PLL_EN pin is set high. External LO drive frequency must be 1× LO. This pin should not be left floating.

Local Oscillator Input/Output. The internally generated 1× LO is available on these pins. When internal LO generation is disabled, an external 1× LO can be applied to these pins.

VCO Control Voltage Input. This pin is driven by the output of the loop filter. Nominal input voltage range on this pin is 1.5 V to 2.5 V.

Rev. C | Page 8 of 32

ADRF6602

TYPICAL PERFORMANCE CHARACTERISTICS

RF FREQUENCY SWEEP

CDAC = 0x0, internally generated high-side LO, RFIN = −5 dBm, fIF = 140 MHz, unless otherwise noted.

IP3SET = OPEN IP3SET = 3.3V

GAIN (dB)

–1

–2

–3

–4

–5

1410 1510 1610 1710 1810 1910 2010

RF FREQUENCY ( MHz)

TA = +85°C TA = +25°C TA = –40°C

Figure 4. Gain vs. RF Frequency

IP3SET = OPEN IP3SET = 3.3V

INPUT IP2 (dBm)

1410 1510 1610 1710 1810 1910 2010

RF FREQUENCY ( MHz)

TA = +85°C TA = +25°C TA = –40°C

Figure 5. Input IP2 vs. RF Frequency

IP3SET = OPEN

IP3SET = 3.3V

18 17 16 15 14 13 12 11 10

9 8 7

NOISE FIGURE (dB)

6 5 4 3 2 1 0 1410 1510 1610 1710 1810 1910 2010

RF FREQUENCY ( MHz)

TA = +85°C TA = +25°C TA = –40°C

Figure 6. Noise Figure vs. RF Frequency

08545-104

08545-105

08545-106

IP3SET = OPEN IP3SET = 3.3V

INPUT IP3 (dBm)

1410 1510 1610 1710 1810 1910 2010

RF FREQUENCY ( MHz)

Figure 7. Input IP3 vs. RF Frequency

IP3SET = OPEN IP3SET = 3.3V

INPUT P1dB (dBm)

1410 1510 1610 1710 1810 1910 2010

RF FREQUENCY ( MHz)

Figure 8. Input P1dB vs. RF Frequency

TA = +85°C TA = +25°C TA = –40°C

08545-107

08545-108

Rev. C | Page 9 of 32

ADRF6602

IF FREQUENCY SWEEP

CDAC = 0x0, internally generated swept low-side LO, fRF = 1960 MHz, RFIN = −5 dBm, unless otherwise noted.

IP3SET = OPEN IP3SET = 3.3V

GAIN (dB)

–1

–2

–3

–4

–5

25 4003753503253002752502252001751501257550 100

IF FREQ UENCY ( MHz)

Figure 9. Gain vs. IF Frequency

IP3SET = OPEN IP3SET = 3.3V

INPUT IP2 (dBm)

25 4003753503253002752502252001751501257550 100

IF FREQ UENCY ( MHz)

Figure 10. Input IP2 vs. IF Frequency, RFIN = −5 dBm

IP3SET = OPEN IP3SET = 3.3V

NOISE FIGURE (dB)

25 4003753503253002752502252001751501257550 100

IF FREQ UENCY ( MHz)

Figure 11. Noise Figure vs. IF Frequency

TA = +85°C TA = +25°C TA = –40°C

08545-110

08545-111

08545-112

IP3SET = OPEN IP3SET = 3.3V

INPUT IP3 (dBm)

25 4003753503253002752502252001751501257550 100

IF FREQ UENCY ( MHz)

Figure 12. Input IP3 vs. IF Frequency, RFIN = −5 dBm

IP3SET = OPEN IP3SET = 3.3V

INPUT P1dB (dBm)

25 4003753503253002752502252001751501257550 100

IF FREQ UENCY ( MHz)

Figure 13. Input P1dB vs. IF Frequency

TA = +85°C TA = +25°C TA = –40°C

08545-113

08545-114

Rev. C | Page 10 of 32

+ 22 hidden pages

ANALOG DEVICES ADRF6602 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

FUNCTIONAL BLOCK DIAGRAM

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

RF SPECIFICATIONS

SYNTHESIZER/PLL SPECIFICATIONS

LOGIC INPUT AND POWER SPECIFICATIONS

TIMING CHARACTERISTICS

Timing Diagram

ABSOLUTE MAXIMUM RATINGS

ESD CAUTION

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TYPICAL PERFORMANCE CHARACTERISTICS

RF FREQUENCY SWEEP

IF FREQUENCY SWEEP