Datasheet RF2494, RF2494PCBA-H Datasheet (RF Micro Devices)

8-53

8

FRONT-ENDS

Preliminary

Product Description

Ordering Information

Typical Applications

Features

Functional Block Diagram

RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro,NC 27409, USA

Tel [phone]

Fax [phone]

http://www.rfmd.com

Optimum Technology Matching® Applied

Si BJT GaAs MESFETGaAs HBT
Si Bi-CMOS

ü

SiGe HBT

Si CMOS

PD

VCC1

VCC2

MIX OUT-

MIX OUT+

LO IN

RX EN

VCC3

GND3

MIX IN

NC

NC

LNA OUT

VCC4

GS

LNA IN

1

2

3

4

5 6 7 8

9

10

12

13141516

11

Bias

Circuits

LNA

RF AMP

RF2494

HIGH FREQUENCY LNA/MIXER

• Part of 2.4GHz IEEE802.11b WLANs

• Digital Communication Systems

• Spread-Spectrum Communication Systems

• WLAN or Wireless Local Loop

• Portable Battery-Powered Equipment

• UHF Digital and Analog Receivers

The RF2494 is a monolithic integrated UHF receiverfront
end suitable for 2.4 G Hz ISM band applications. The IC
contains all of the required components to implement the
RF functions of the receiver except for the passive filter­ing and LO generation. It contains an LNA (low-noise
amplifier), a second RF amplifier and a doubly balanced
mixer. The output of the LNA is made available as an out­put to permit the insertion of a bandpass filter between
the LNA and the RF/Mixer section. The mixer outputs can
beselectivelydisabledtoallowfortheIFfiltertobeused
in the transmit mode.

• Single 2.7V to 3.6V Power Supply

• 2400MHz to 2500MHz Operation

• Two Gain Settings: 28dB or 12dB

•4.5dBCascadedNF,HighGainMode

• 20mA DC Current Consumption

• Input IP

3

: -23dBm or -8dBm

RF2494 High Frequency LNA/Mixer
RF2494 PCBA-H Fully Assembled Evaluation Board (2.5GHz)

8

Rev A0 010730

Dimensions in mm.

1.85

1.55 sq.

.60
.24 typ

.75
.50

.23
.13

4PLCS

.65
.30

4PLCS

4.00
sq.

2

.35
.23

.65

.05
.01

12°

max

1.00

0.85

.80
.65

NOTES:

Shaded Pin is Lead 1.1

5 Die thickness allowable: 0.305 mm max.

Package Warpage: 0.05 max.

4

Pin 1 identifier must exist on top surfaceof package by identification mark or
feature on the package body. Exact shape and size is optional.

3

Dimension applies to plated terminal and is measured between 0.02 mm and

0.25 mm fromterminal end.

2

Package Style: LCC, 16-Pin, 4x4

Preliminary

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8

FRONT-ENDS

Absolute Maximum Ratings

Parameter Rating Unit

Supply Voltage -0.5 to 3.6 V

DC

Input LO and RF Levels +6 dBm
Operating Ambient Temperature -40 to +85 °C
Storage Temperature -40 to +150 °C

Parameter

Specification

Unit Condition

Min. Typ. Max.

Overall

T=25°C, VCC=3V,RF=2442MHz,

LO =2068MHz, -10dBm
RF Frequency Range 2400 to 2500 MHz
IF Frequency Range 10 374 500 MHz
Cascade Gain 26 28 31 dB IF=374MHz, GAIN SEL=1

13 15 17 dB IF=374MHz, GAIN SEL=0

Cascade IP3 -29 -22 -19 dBm Referenced to the input, GAIN SEL = 1

-8 dBm Referenced to the input, GAIN SEL = 0

Cascade Noise Figure 4.5 dB Single sideband, GAIN SEL = 1

18 dB Single sideband, GAIN SEL = 0

Input P1dB -28 dBm GAIN SEL = 1

-14 dBm GAIN SEL = 0

LNA

Noise Figure 2.3 dB GAIN SEL = 1

7 dB GAIN SEL = 0
Input VSWR 2:1 No external matching
Input IP3 -3 dBm GAIN SEL = 1

-3 dBm GAIN SEL = 0

Gain 10 dB GAIN SEL = 1

-6 dB GAIN SEL = 0
Reverse Isolation 22 dB
Output Impedance 50 Ω

RF Amp and Mixer

Noise Figure 10 dB Single sideband
Input Impedance 50 Ω
Input IP3 -17 dBm
Conversion Power Gain 18 dB With Current Combiner (1kΩ between open

collectors and 250Ω single ended load)

Output Impedance 4 kΩ Open Collector

LO Input

LO Level -15 -10 0 dBm
LO to RF Rejection 42 dB LO input to LNA input
LO to IF Rejection 15 dB LO input to IF output
LO Input VSWR 2:1

Power Down Control

Logic Controls “ON” VCC-0.3 V Voltage at the input of RX EN, PD
Logic Controls “OFF” 300 mV and GAIN SEL

Turn on Time 400 1000 nS From PD Going high.
Turn on Time 100 200 nS From RX EN Going high. PD = “1”

Power Supply

Voltage 2.7 3.3 3.6 V
Current Consumption 15 17 26 mA GAIN SEL =1, RX EN=1, PD=1

17 26 mA GAIN SEL=0, RX EN=1, PD=1

8 10 16 mA GAIN SEL=X, RX EN=0, PD=1

0.2 1 µA GAIN SEL =X, RX EN= X, PD=0

Caution! ESD sensitive device.

RF Micro Devices believes thefurnished information is correct and accurate
at the time of this printing. However, RF Micro Devices reserves the right to
make changes to its products without notice. RF Micro Devices does not
assume responsibility for the use of the described product(s).

Preliminary

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RF2494

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8

FRONT-ENDS

Pin Function Description Interface Schematic

1PD

The power enable pin. When PD is >VCC-300mV, the part is biased
on. When PD is <300mV,then the part is turned off and typically draws

less than 1µA.

2VCC1

Supply voltage for bias circuits and logic control. A 10pF external
bypass capacitor is required and an additional 0.01µF is required if no
other low frequency bypass capacitors are nearby. The trace length
between the pin and the bypass capacitors should be minimized. The
ground side of the bypass capacitors should connect immediately to
ground plane.

3VCC2

Supply voltage for LO_Buffer. A 10pF bypass capacitor is required and
an additional 0.01µF is required if there is no other low frequency
bypass capacitor in the area. The trace length be tween the pin and the
bypass capacitors should be minimized. The ground side of the bypass
capacitors should connect immediately to ground plane.

See pin 6.

4MIXOUT-

The inverting ope n collector output of the mixer. This pin needs to be
externally biased and DC isolated from other parts of the circui t. This
output can drive a Balun, with MIXOUT+, to convert to unbalanced to
drive a SAW filter. The Balun can be either broadband (transformer) or
narrowband (discrete LC matching). Alternatively, MIXOUT+ may be
used alone to drive a SAW single-ended, with an RF choke (high Z at
IF) from VCC to MIXOUT-.

5MIXOUT+

The non-inverting open collector output of the mixer. This pin needs to
be externally biased and DC isolated from other parts of the circuit.
This output can drive a Balun,with M IXOUT+, toconvertto unbalanced
to drive a SAW filter. The Balun can be either broadband (transformer )
or narrowband (discrete LC matching). Alternatively,MIXOUT+ maybe
used alone to drive a SAW single-ended, with an RF choke (high Z at
IF) from VCC to MIXOUT+.

See pin 4.

6LOIN

LO input pin. This input needs a DC-blocking cap. External matching is
recommended to 50Ω.

7RXEN

This control pin allows the mixer output pins to be put into a high
impedance state. This allows the transmit signal path to share the
same IF filter as the receiver.

8VCC3

Supply voltage for mixer preamp. See pin 10.

9GND3

Ground pin for mixer preamp. This lead inductance is intended to be
similar to VCC3 lead inductance.

See pin 10.

10 MIX IN

Mixer RF Input port. This pin is NOT internally DC-blocked.An external
blocking capacitor must be provided if the pin is connected to a device
with DC present. A value of >22pF is recommended. To minimize the
noise figure it is recommended to have a bandpass filter before this
input. This will prevent the noise at the image frequency from being
convertedtotheIF.

11 NC

Not connected.

12 NC

Not connected.

MIX OUT+ MIX OUT-

LO IN

VCC2

VCC3

GND3

MIX IN

Preliminary

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8

FRONT-ENDS

Pin Function Description Interface Schematic

13 LNA OUT

RF signal output for external 50Ω filtering.The use of a filter here is
optional but does provide for lower noise floor and better out-of-band
rejection.

See pin 14.

14 VCC4

Supply voltage for the LNA. This pin should be bypassed with a 10 pF
capacitor to ground as close to the pin as possible. The shunt induc­tance from thi s pin to ground via the supply de coupling must be tuned
to match the LNA output to 50Ω at the desired operating frequency.

15 GS

LNA gain control. When GAIN SEL is >VCC-300mV, LNA gain is at 10
dB. When GAIN SEL is <300mV, the LNA gain is -6dB.

See pin 14.

16 LNA IN

This pin is NOT internally DC blocked. An external blocking capacitor
must be provided if the pin is connected to a device with DC p resent. If
a blocking capacitor is required, a value of 2pF is recommended.

See pin 14.

P2

LNA IN

BIAS

VCC4

P1

GAIN SEL

P15

LNA OUT

EXTERNAL

DECOUPLING

Microstrip

-16 dB

Preliminary

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8

FRONT-ENDS

Th

eory of Operation

RX

15 dB Gain

IL =1-3 dB

2.4 to 2.483 GHz

LNA

Dual Gain Modes

-5 dBand +10dB

Gain
Select

RF2494

SSOP-16EPP

Filter

2.4 to 2.483 GHz

SAW

IL =10 dB max

RX

TX

15 dB

15 dB

IF Amp

-15dBto35dBGain

OUT Q

OUT I

Filter

Filter

Selectable LPF

TX

Σ

I INPUT

QINPUT

15 dB Gain

Range

+45

°

-45°

IL = 1-3 dB

2.4 to 2.483 GHz

10 dBm

PA Driver

RF2948

Base Band Amp.

Active Selectable LPF

(f

C

=1MHzto40MHz)

0-30 dB Gain

RF Micro Devices

2.4 GHz ISM Chipset

* 2

RX VGC

TXVGC

IF

VCO

RF

VCO

Dual
Frequency
Synthesizer

T/R

Switch

RF2189

Figure 1. Entire Chipset Functional Block Diagram

The RF2494 contains the LNA/Mixer for this chipset.
The LNA is made from two stages including a common
emitter amplifier stage with a power gain of 13dB and
an attenuator which has an insertion loss of 3dB in
high gain mode, and 17dB in low gain mode. The
attenuator was put after the LNA so that system noise
figure degradation would be minimized. A single gain
stage was used prior to the image filter to maximize
IP3 which minimizes the risk of large out-of-bad signals
jamming the desired signal.

The mixer on the RF2494 is also two stages. The first
stage is a common emitter amp used to boost the total
power gain prior to the lossy SAW filter, to convert to a
differential signal to the input of the mixer, and to
improve the noise figure of the mixer. The second
stage is a double balanced mixer whose output is dif­ferential open collector. It is recommended that a “cur­rent combiner” is used (as shown in figure 2) at the
mixer output to maximize conversion gain, but other
loads can also be used. The current combiner is used
to do a differential to single ended conversion for the
SAW filter. C1, C2 and L1 are used to tune the circuit
for a specific IF frequency. L2 is a choke to supply DC
current to the mixer that is also used as a tuning ele­ment, a long with C3, to match to the SAW filter’s input
impedance. RL is the SAW filter’s input impedance.

The mixer power conversion gain is +19dB when R1 is
set to 1kΩ. The conversion gain can be adjusted up
~5 dB or down ~7dB by changing the value of R1.
Once R1 is chosen, L2 and C3 can be used to tune the
output for the SAW filter.

The cascaded power gain of the LNA /Mixer is 29dB,
which after insertion loss in the image filter (~3 dB) and
IF SAW filter (~10dB), still gives 16dB of gain prior to
the IF amps. Because of this, the noise figure of the IF
amps should not significantly degrade system noise
figure.

The LNA input should be matched for a good retur n
loss for optimum gain and noise figure. To allow the
designer to match each of these ports, 2-port s-param­eter data is available for the LNA, and 1-port data is
available for MIXER IN and LO IN.

L1
R1

C1 C2

L2

C3

RL

V

CC

OUT

Open Collector

Mixer Output

Figure 2. Current Combiner for Mixer Load

Preliminary

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8

FRONT-ENDS

Evaluation Board Schema t ic

(Download Bill of Materials from www.rfmd.com.)

1

2

3

4

5 6 7 8

9

10

12

13141516

11

Bias

Circuits

LNA

RF AMP

PD

C19

22 pF

C4

10 nF

VCC1, VCC2

L2

120 nH

R1

2.2 kΩ

C11

0.5 pF

C12

0.5 pF

L1

100 nH

C6

10 nF

C15

22 pF

50 Ωµstrip

J3

IF OUT

L3

8.2 nH

C16
1pF

50 Ωµstrip

C18

10 nF

50 Ωµstrip

J5

LO IN

RX EN

VCC3

C21

22 pFC710 nF

C17

10 nF

L5

1.8 nH

C2

0.5 pF

50 Ωµstrip

R3

0 Ω

R5*
0 Ω

50 Ωµstrip

J4

MIX IN

IN
GND
OUT

FL1

R2

0 Ω

R4*
0 Ω

50 Ωµstrip

J2

LNA OUT

50 Ωµstrip

C10

1.5 pF

C5

10 nF

R6

10 Ω

VCC4GS

C9

10 nF

C8

2pF

L6

4.7 nH

50 Ωµstrip

J1

LNA IN

2494400-

P1

1
2
3

CON3

GND

P1-3 PD

VCC1, VCC2P1-1

C3

10 nF

P2

1
2
3

CON3

GND

P2-1 GS

P2-3

C20

10 nF

VCC4

P3

1
2
3

CON3

GND

P3-1 VCC3

P3-3 RX EN

* For cascaded configuration,

jumpersR2 and R3 need tobe
installed with R4 and R5 taken out.

Preliminary

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FRONT-ENDS

Evaluation Board Layout

Board Size 1.5” x 1.5”

Board Thickness 0.031”, Board Material FR-4, Multi-Layer

NOTE: In the following charts, all cascaded data measured with a bandpass filter inserted between LNA OUT and MIX
IN, having cut frequencies: f

L

=TBD,fM= TBD, and insertion loss=TBD.

Preliminary

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FRONT-ENDS

LNA + Mixer Gain versus VCC (2.45 GHz),

Attenuator Off

25.0

26.0

27.0

28.0

29.0

30.0

31.0

32.0

33.0

2.73.03.33.6

VCC

Gain (dB)

-40C Gain
25C Gain
85C Gain

LNA + Mixer IIP3 versus VCC(2.45 GHz),

Attenuator Off

-31.0

-30.0

-29.0

-28.0

-27.0

-26.0

-25.0

-24.0

2.73.03.33.6

VCC

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

LNA + Mixer Gain versus RF Frequency (3.3 V),

Attenuator Off

26.00

27.00

28.00

29.00

30.00

31.00

32.00

33.00

34.00

2.40 2.45 2.50

RF Frequency (GHz)

Gain (dB)

-40C Gain
25C Gain
85C Gain

LNA + Mixer IIP3 versus RF Frequency (3.3V),

Attenuator Off

-32.00

-31.00

-30.00

-29.00

-28.00

-27.00

-26.00

-25.00

-24.00

2.40 2.45 2.50

RF Frequency (GHz)

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

LNA + Mixer Gain versus VCC (2.45 GHz),

Attenuator On

9.0

9.5

10.0

10.5

11.0

11.5

12.0

12.5

13.0

13.5

14.0

2.73.03.33.6

VCC

Gain (dB)

-40C Gain
25C Gain
85C Gain

LNA + Mixer IIP3 versus VCC(2.45 GHz),

Attenuator On

-10.4

-10.2

-10.0

-9.8

-9.6

-9.4

-9.2

-9.0

-8.8

-8.6

2.7 3.0 3.3 3.6

VCC

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

Preliminary

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FRONT-ENDS

LNA + Mixer SSB Noise Figure versus VCC (2.45 GHz),

Attenuator Off

4.4

4.6

4.8

5.0

5.2

5.4

5.6

2.7 3.0 3.3 3.6

VCC

SSB Noise Figure (dB)

25C NF
85C NF

-40C NF

L

NA + Mixer SSBNoise Figure versus

RF Frequency (3.3 V), Attenuator Off

3.00

3.50

4.00

4.50

5.00

5.50

2.40 2.45 2.50

RF Frequency (GHz)

SSB Noise Figure (dB)

25C NF
85C NF

-40C NF

LNA + Mixer SSB Noise Figure versus VCC (2.45 GHz),

Attenuator On

17.8

18.0

18.2

18.4

18.6

18.8

19.0

19.2

19.4

19.6

19.8

2.73.03.33.6

VCC

SSB Noise Figure (dB)

25C NF
85C NF

-40C NF

LNA+MixerSSBNoiseFigureversus

RF Frequency (3.3 V), Attenuator On

13.00

14.00

15.00

16.00

17.00

18.00

19.00

20.00

2.40 2.45 2.50

RF Frequency (GHz)

SSB Noise Figure (dB)

25C NF
85C NF

-40C NF

LNA + Mixer Gain versus RF Frequency (3.3 V),

Attenuator On

9.00

9.50

10.00

10.50

11.00

11.50

12.00

12.50

13.00

13.50

14.00

14.50

15.00

2.40 2.45 2.50

RF Frequency (GHz)

Gain (dB)

-40C Gain
25C Gain
85C Gain

LNA + Mixer IIP3 versus RFFrequency (3.3 V),

Attenuator On

-11.00

-10.50

-10.00

-9.50

-9.00

-8.50

-8.00

-7.50

-7.00

2.40 2.45 2.50

RF Frequency (GHz)

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

Preliminary

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FRONT-ENDS

LNA + Mixer Gain versus IF Frequency (3.3 V)

26.0

27.0

28.0

29.0

30.0

31.0

32.0

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 450.0 500.0

IF Frequency (MHz)

Gain (dB)

Gain

LNA + Mixer IIP3 versus IF Frequency (3.3 V)

-31.0

-30.0

-29.0

-28.0

-27.0

-26.0

-25.0

-24.0

-23.0

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 450.0 500.0

IF Frequency (MHz)

IIP3 (dBm)

IIP3

LNA ICCversus VCC

(PD = 1, RX EN = 0)

10.9

11.1

11.3

11.5

11.7

11.9

12.1

12.3

12.5

12.7

2.73.03.33.6

VCC

I

CC

(mA)

25C LNA Icc
85C LNA Icc

-40C LNA Icc

Total ICCversus VCC

(PD = 1, RX EN = 1)

18.0

18.5

19.0

19.5

20.0

20.5

21.0

2.73.03.33.6

VCC

I

CC

(mA)

25C Total Icc
85C Total Icc

-40C Total Icc

Isolation

-48.00

-43.00

-38.00

-33.00

-28.00

-23.00

-18.00

-13.00

2.12 2.17 2.22

LO Frequency (GHz)

Isolation (dB)

LO-mixin
LO-LNAin
LNAin-LNAout
LO-IFout

Preliminary

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FRONT-ENDS

LNA Gain versus VCC (2.45 GHz),

Attenuator Off

9.5

9.6

9.7

9.8

9.9

10.0

10.1

10.2

10.3

10.4

10.5

2.73.03.33.6

VCC

Gain (dB)

-40C Gain
25C Gain
85C Gain

LNA IIP3 versus VCC (2.45 GHz),

Attenuator Off

-2.8

-2.7

-2.6

-2.5

-2.4

-2.3

-2.2

-2.1

-2.0

2.7 3.0 3.3 3.6

VCC

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

LNA Gain versus VCC (2.45 GHz),

Attenuator On

-5.6

-5.4

-5.2

-5.0

-4.8

-4.6

-4.4

-4.2

-4.0

2.7 3.0 3.3 3.6

VCC

Gain (dB)

-40C Gain
25C Gain
85C Gain

LNA IIP3 versus VCC (2.45 GHz),

Attenuator On

-3.0

-2.8

-2.6

-2.4

-2.2

-2.0

-1.8

2.7 3.0 3.3 3.6

VCC

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

LNA Gain versus RF Frequency (3.3 V),

Attenuator Off

9.70

9.80

9.90

10.00

10.10

10.20

10.30

10.40

10.50

10.60

10.70

2.40 2.45 2.50

RF Frequency (GHz)

Gain (dB)

-40C Gain
25C Gain
85C Gain

LNA IIP3 versus RF Frequency (3.3 V),

Attenuator Off

-3.50

-3.00

-2.50

-2.00

-1.50

-1.00

-0.50

0.00

2.40 2.45 2.50

RF Frequency (GHz)

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

Preliminary

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FRONT-ENDS

LNA Gain versus RF Frequency (3.3 V),

Attenuator On

-5.50

-5.30

-5.10

-4.90

-4.70

-4.50

-4.30

-4.10

-3.90

-3.70

2.40 2.45 2.50

RF Frequency (GHz)

Gain (dB)

-40C Gain
25C Gain
85C Gain

LNA IIP3 versus RF Frequency (3.3 V),

Attenuator On

-2.90

-2.80

-2.70

-2.60

-2.50

-2.40

-2.30

-2.20

-2.10

-2.00

-1.90

2.40 2.45 2.50

RF Frequency (GHz)

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

LNA Noise Figure versusVCC (2.45 GHz),

Attenuator Off

2.10

2.12

2.14

2.16

2.18

2.20

2.22

2.24

2.26

2.28

2.30

2.32

2.70 3.00 3.30 3.60

VCC

Noise Figure (dB)

-40C NF
25C NF
85C NF

LNA Noise Figure versus RF Frequency (3.3 V),

Attenuator Off

2.10

2.15

2.20

2.25

2.30

2.35

2.40

2.45

2.50

2.40 2.45 2.50

RF Frequency (GHz)

Noise Figure (dB)

-40C NF
25C NF
85C NF

LNA Noise Figure versusVCC (2.45 GHz),

Attenuator On

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

2.7 3.0 3.3 3.6

VCC

Noise Figure (dB)

-40C NF
25C NF
85C NF

LNA Noise Figure versus RF Frequency (3.3 V),

Attenuator On

5.00

5.50

6.00

6.50

7.00

7.50

8.00

8.50

9.00

2.40 2.45 2.50

RF Frequency (GHz)

Noise Figure (dB)

-40C NF
25C NF
85C NF

Preliminary

8-65

RF2494

Rev A0 010730

8

FRONT-ENDS

MixerGain versus VCC (2.45 GHz)

16.0

17.0

18.0

19.0

20.0

21.0

22.0

2.73.03.33.6

VCC

Gain (dB)

-40C Gain
25C Gain
85C Gain

Mixer IIP3 versus VCC (2.45 GHz)

-18.0

-17.5

-17.0

-16.5

-16.0

-15.5

-15.0

-14.5

2.7 3.0 3.3 3.6

VCC

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

MixerGain versus RF Frequency (3.3 V)

16.00

17.00

18.00

19.00

20.00

21.00

22.00

2.40 2.45 2.50

RF Frequency (GHz)

Gain (dB)

-40C Gain
25C Gain
85C Gain

MixerIIP3 versus RF Frequency (3.3 V)

-18.50

-18.00

-17.50

-17.00

-16.50

-16.00

-15.50

-15.00

2.40 2.45 2.50

RF Frequency (GHz)

IIP3 (dBm)

-40C IIP3
25C IIP3
85C IIP3

MixerSSB Noise Figureversus VCC (2.45 GHz)

10.0

10.5

11.0

11.5

12.0

12.5

13.0

13.5

2.73.03.33.6

VCC

SSB Noise Figure (dB)

-40C NF
25C NF
85C NF

MixerSSB NoiseFigure versusRF Frequency(3.3 V)

7.00

8.00

9.00

10.00

11.00

12.00

13.00

2.40 2.45 2.50

RF Frequency (GHz)

SSB Noise Figure (dB)

-40C NF
25C NF
85C NF

Preliminary

8-66

RF2494

Rev A0 010730

8

FRONT-ENDS

MixerGain versus LO Amplitude

(VCC= 3.3 V, RF Frequency = 2.45 GHz)

14

15

16

17

18

19

20

-24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 0 2 4 6

LO Amplitude(dBm)

Gain (dB)

Gain

Mixer IIP3 versus LO Amplitude

(VCC= 3.3 V, RF Frequency = 2.45 GHz)

-20

-19

-18

-17

-16

-15

-14

-24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 0 2 4 6

LO Amplitude(dBm)

IIP3 (dBm)

IIP3