MC13142 Ver la hoja de datos (PDF) - Motorola => Freescale

Número de pieza

componentes Descripción

Fabricante

MC13142

Low Power DC – 1.8 GHz LNA, Mixer and VCO

Motorola => Freescale 

MC13142D

Rev A

MC13142

Figure 2. 900 MHz Circuit Side Component Placement View

Mix In

Mix Lin Cont

LNA

Output

47 p

LNA

Input

Toko

926A10

Dielectric

Filter

PC

Rotary

Switch

100 p

18 nH

51

6.8 nH

16:1

Impedance

Transformer

MC13142D

2.4 p

2.4 p

390 nH

120 k

V–Cont

5.6 p

ÉÉ 33 k

MMBV809

ÉÉÉÉÉÉVCC

C

L

IF

Out

100 p

LO

Buf

Out

NOTES: The PCB is laidout for the 4DFA (2 pole SMD type) and 4DFB (3 pole SMD type) filters which are available for applications in

cellular and GSM,GPS (1.2–1.5 GHz), DECT, PHS and PCS (1.8–2.0 GHz) and ISM Bands (902–928 MHz and 2.4–2.5 GHz).

In the component placement shown above, the 926.5 MHz dielectric type image filter is used (Toko Part # 4DFA–926A10).

The PCB also accommodates a surface mount SAW filter in an eight or six pin ceramic package for the cellular base and

handset frequencies. Recommended manufacturers are Siemens and Murata.

Traces are provided on the PCB to evaluate the LNA and mixer separately. The component placement view shows external

circuit components used for the 926.5 MHz application circuit. Note: some traces must be cut to accommodate placement of

components; likewise some traces must be shorted. The voltage controlled oscillator is shown with the varactor referenced to

VEE ground. The PCB is modified as shown to do this.

16:1 broadband impedance transformer is mini circuits part #TX16–R3T; it is in the leadless surface mount “TX” package.

Components L and C comprise a low pass filter used to provide narrowband matching at a given IF frequency. For example at

49 MHz C = 36 p and L = 330 nH.

The microstrip trace on the ground side of the PCB is intended for a microstrip resonator; it is cut free when using a lump

inductor as done above.

MOTOROLA RF/IF DEVICE DATA

7

Share Link: