Motorola MC13142D Datasheet

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The MC13142 is intended to be used as a first amplifier, voltage controlled oscillator and down converter for RF applications. It features wide band operation, low noise, high gain and high linearity while maintaining low current consumption. The circuit consists of a Low Noise Amplifier (LNA), a Voltage Controlled Oscillator (VCO), a buf fered oscillator output, a mixer, an Intermediate Frequency amplifier (IF mixer IF bandwidth allows this part also to be used as an up converter and exciter amplifier.

• Wide RF Bandwidth: DC–1.8 GHz

• Wide LO Bandwidth: DC–1.8 GHz

• Wide IF Bandwidth: DC–1.8 GHz

• Low Power: 13 mA @ V

• High Mixer Linearity: P

= 2.7 – 6.5 V

i1.0 dB

= 3.0 dBm

• Linearity Adjustment Increases IP

• Single–Ended 50 Ω Mixer Input

• Double Balanced Mixer Operation

• Open Collector Mixer Output

• Single Transistor Oscillator with Collector, Base and Emitter Pinned Out

• Buffered Oscillator Output

) and a dc control section. The wide

amp

Up to 20 dBm

3in

LOW POWER DC – 1.8 GHz

LNA, MIXER and VCO

SEMICONDUCTOR

TECHNICAL DATA

D SUFFIX

PLASTIC PACKAGE

CASE 751B

(SO–16)

PIN CONNECTIONS

SO–16

Osc E

Osc B

Osc C, V

This device contains 176 active transistors.

This document contains information on a new product. Specifications and information herein are subject to change without notice.

MOTOROLA RF/IF DEVICE DATA

Buff

6 7

Mx Lin

Cont

Mix Lin Cont

IF+

IF–

out

ORDERING INFORMATION

Operating

Device

MC13142D TA = –40° to +85°C SO–16

 Motorola, Inc. 1998 Rev 1

Temperature Range

Package

MC13142

MAXIMUM RATINGS (T

Power Supply Voltage V Operating Supply Voltage Range V

NOTE: ESD data available upon request.

ELECTRICAL CHARACTERISTICS (V

Supply Current (Disable) I

Pin 15 with Pin 1 @ 0 V I Pin 10 and 11 with Pin 1 @ 0 V I Pin 6 with Pin 1 @ 0 V I

Supply Current (Enable) I

Pin 15 with Pin 1 @ 3.0 V I Pin 10 with Pin 1 @ 3.0 V I Pin 6 with Pin 1 @ 3.0 V I

Amplifier Gain (50 Ω Insertion Gain) S Amplifier Reverse Isolation S Amplifier Input Match Γin Amplifier Output Match Γ Amplifier 1.0 dB Gain Compression Pin Amplifier Input Third Order Intercept IP3 Amplifier Noise Figure (Application Circuit) NF 1.0 1.8 4.0 dB Amplifier Gain @ N.F. G Mixer Voltage Conversion Gain (RP = RL = 800 Ω) VG Mixer Power Conversion Gain (RP = RL = 800 Ω) PG Mixer Input Match Γin Mixer SSB Noise Figure NF Mixer 1.0 dB Gain Compression Pin Mixer Input Third Order Intercept IP3 Oscillator Buffer Drive (50 Ω) P Oscillator Phase Noise @ 25 kHz Offset N RFin Feedthrough to RF RF

Feedthrough to RF

out

LO Feedthrough to IF P LO Feedthrough to RF LO Feedthrough to RF Mixer RF Feedthrough to IF P Mixer RF Feedthrough to RF

= 25°C, unless otherwise noted.)

Rating

= 3.0 V, TA = 25°C, LOin = –10 dBm @ 950 MHz, IF @ 50 MHz.)

Characteristic Symbol Min Typ Max Unit

in m

Symbol Value Unit

CC(max)

7.0 Vdc

2.7 to 6.5 Vdc

CC_Total

CC_15

CC_Mix

CC_6

CC_Total

CC_15

CC_Mix

CC_6

21 12 amp

out amp

–1.0 dB

C C M

SSBM

–1.0 dBM

InM

VCO

RFin–RFm

RFout–RFm

LO–IF

LO–RFin

LO–RFm

RFm–IF

RFm–RFin

–230 – 230 –110 – 110

–20 – 20

–100 – 100

8.25 13.5 26

1.0 – 4.5

1.25 – 7.5

6.0 – 14

6.5 12 13 dB – –33 – dB – –10 – dB – –15 – dB

–18 –15 –8.0 dBm

– –5.0 – dBm

– 17 – dB – 9.0 – dB

–7.0 –3.0 –2.0 dB

– –20 – dB – 12 – dB – 3.0 – dBm – –1.0 – dBm

–19.5 –16 –12 dBm

– –90 – dBc/Hz – –35 – dB – –35 – dB – –35 – dBm – –35 – dBm – –35 – dBm – –25 – dB – –25 – dB

MOTOROLA RF/IF DEVICE DATA

MC13142

CIRCUIT DESCRIPTION

General

The MC13142 is a low power LNA, double–balanced Mixer, and VCO. This device is designated for use as the frontend section in analog and digital FM systems such as Digital European Cordless Telephone (DECT), PHS, PCS, Cellular, UHF and 800 MHz Special Mobile Radio (SMR), UHF Family Radio Services and 902 to 928 MHz cordless telephones. It features a mixer linearity control to preset or auto program the mixer dynamic range, an enable function and a wideband IF so the IC may be used either as a down converter or an up converter. Further details are covered in the Pin by Pin Description which shows the equivalent internal circuit and external circuit requirements.

Current Regulation/Enable

Temperature compensating voltage independent current regulators are controlled by the enable function in which “high” powers up the IC.

Low Noise Amplifier (LNA)

The LNA is internally biased at low supply current (approximately 2.0 mA emitter current) for optimal noise figure and gain. The LNA output is biased internally with a 600 Ω resistor to VCC. Input and output matching may be achieved at various frequencies using few external components. Matching the LNA for Maximum stable gain

(MSG) yields noise performance within a few tenths of a dB of the minimum noise figure.

Mixer

The mixer is a double–balanced four quadrant multiplier biased class AB allowing for programmable linearity control via an external current source. An input third order intercept point of 20 dBm may be achieved. All 3 ports of the mixer are designed to work up to 1.8 GHz. The mixer has a 50 Ω single–ended RF input and open collector differential IF outputs. An on–board Local Oscillator transistor has the emitter, base and collector pinned out to implement a low phase noise VCO in various configurations. Additionally, a buffered LO output is provided for operation with a frequency synthesizer. The linear gain of the mixer is approximately 0 dB with a SSB noise figure of 12 dB in the IF output circuit configuration shown in the application example.

Local Oscillator

The on–chip transistor operates with coaxial transmission line or LC resonant elements to over 2.0 GHz. Biasing is done with a temperature compensated current source in the emitter and a collector to base internal resistor of 7.6 kΩ; however, an RFC from VCC to base is recommended. The application circuit shows a voltage controlled Clapp oscillator operating at center frequency of 975 MHz.

MOTOROLA RF/IF DEVICE DATA

MC13142

Osc C

LO Buf

16 Pin

SOIC

ÁÁÁ

Symbol

ÁÁ

out

ÁÁ

PIN FUNCTION DESCRIPTION

Equivalent Internal Circuit

(20 Pin LQFP)

40 k1

2.0 V

70 k

2.0 V

ref2

out

Description

Enable, E Osc

In SO–16, both enables, (for the Oscillator/LO Buffer and

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LNA/Mixer) are bonded to Pin 1. Enable by pulling up to VCC or to greater than 2.0 VBE.

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600

RF Input

The input is the base of an NPN low noise amplifier.

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Minimum external matching is required to optimize the input return loss and gain.

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VEE – Negative Supply

VEE pin is taken to an ample dc ground plane through a

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low impedance path. The path should be kept as short as possible. A two sided PCB is implemented so that

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ground returns can be easily made through via holes.

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RF Output

The output is from the collector of the LNA; it is internally

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biased with a 600 Ω resistor to VCC. As shown in the 926 MHz application receiver the output is conjugately

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matched with a shunt L, and series L and C network.

2.0 mA

ref3

ÁÁÁ

4 5 6

6 8

Osc E

ÁÁ

Osc B Osc C

ÁÁ

LO Buff

ÁÁ

Osc E

Osc B

Osc C

7.6 k

On–Board VCO Transistor

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The transistor has the emitter, base and collector + V pins available. Internal biasing which is compensated for

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stability over temperature is provided. It is recommended

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that the base pin is pulled up to VCC through an RFC

1.5 mA

chosen for the particular oscillator center frequency. The

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application circuit shows a modified Colpitts or Clapp

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oscillator configuration and its design is discussed in detail in the application section.

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Supply Voltage (VCC)

Two VCC pins are provided for the Local Oscillator and

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LO Buffer Amplifier. The operating supply voltage range

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is from 2.7 Vdc to 6.5 Vdc. In the PCB layout, the V trace must be kept as wide as feasible to minimize

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inductive reactances along the trace. VCC should be

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decoupled to VEE at the IC pin as shown in the component placement view.

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Local Oscillator Buffer

1.0 mA

This is a buffered output providing –16 dBm

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(50 Ω termination) to drive the fin pin of a PLL

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synthesizer. Impedance matching to the synthesizer may be necessary to deliver the optimal signal and to

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improve the phase noise performance of the VCO.

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MOTOROLA RF/IF DEVICE DATA

16 Pin

SOIC

9, 12

ÁÁÁ

10, 11

ÁÁÁ

Symbol

ÁÁ

IF–, IF+

ÁÁ

PIN FUNCTION DESCRIPTION (continued)

Equivalent Internal Circuit

(20 Pin LQFP)

IF–

IF+

MC13142

Description

VEE, Negative Supply

These pins are VEE supply for the mixer IF output. In the

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application PC board these pins are tied to a common VEE trace with other VEE pins.

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IF Output

The IF is a differential open collector configuration which

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designed to use over a wide frequency range for up conversion as well as down conversion. Differential to

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single–ended circuit configuration and matching options

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are discussed in the application section. 6.0 dB of additional Mixer gain can be achieved by conjugately

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matching at the desired IF frequency.

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ÁÁÁ

15 V

ÁÁ

Mix Lin

ÁÁ

Cont

ÁÁ

Mix Lin

Cont

ref1

The mixer input impedance is broadband 50 Ω for

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applications up to 1.8 GHz. It easily interfaces with a RF

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ceramic filter as shown in the application schematic.

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Mixer Linearity Control

Mixer RF Input

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The mixer linearity control circuit accepts approximately 0 to 2.3 mA control current to set the dynamic range of

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the mixer. An Input Third Order Intercept Point, IIP3 of

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20 dBm may be achieved at 2.3 mA of control current (approximately 7.0 mA of additional supply current).

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400

VCC, Power Supply

MOTOROLA RF/IF DEVICE DATA

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