TDA5630 Просмотр технического описания (PDF) - Philips Electronics

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TDA5630

9 V VHF, hyperband and UHF mixer/oscillator for TV and VCR 3-band tuners

Philips Electronics 

Philips Semiconductors

9 V VHF, hyperband and UHF

mixer/oscillator for TV and VCR 3-band tuners

Product specification

TDA5630;

TDA5631

handbook, full pagewidth

NOISE

SOURCE

BNC

RIM

INPUT

CIRCUIT

(see Fig. 5)

AIN IFOUT1

D.U.T.

GND IFOUT2

TR

NOISE

METER

2x5

turns

2

turns

N1/N2 = 5

MBH046

(1) NF = NFmeas − loss (input circuit) dB.

Fig.6 Noise figure measurement in band A.

handbook, full pagewidth unwanted

signal

50 Ω source

AC

AM = 30%

eu

1 kHz

HYBRID

50 Ω

BD

wanted

ew

signal

source

AIN IFOUT1

D.U.T.

Vo

2x5

turns

FILTER

18 dB

attenuator

38.9 MHz

2

V Vmeas

turns

modulation

analyzer

50 Ω

GND IFOUT2

50

Ω

N1/N2 = 5 RMS

voltmeter

MBH047

Vmeas = Vo − 15.4 dB (transformer ratio N1/N2 = 5 and transformer loss).

Wanted output signal at fRFW = 180 MHz: Vow =104 dBµV (Vmeas = 88.6 dBµV).

We measure the level of the unwanted signal Vou causing 0.3 % AM modulation in the wanted output signal; fRFU = 185.5 MHz.

Vou = Vmeas + 15.4 dB.

fosc = 218.9 MHz.

Filter characteristics: fc = 38.9 MHz, f−3dBBW = 1.2 MHz, f−30dBBW = 2.64 MHz.

Fig.7 Cross modulation measurement in band A.

1996 Mar 21

11

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