TDA5634T 데이터 시트보기 (PDF) - Philips Electronics

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TDA5634T

9 V UHF mixer/oscillator for TV and VCR tuners

Philips Electronics 

Philips Semiconductors

9 V UHF mixer/oscillator for TV and VCR

tuners

Product specification

TDA5634T

handbook, full paguenwwidtahnted

signal

50 Ω source

AC

AM = 30%

eu

1 kHz

HYBRID

50 Ω

B

wanted

ew

signal

source

D

50

Ω

AC

HYBRID

BD

50

Ω

CIN1 IFOUT1

D.U.T.

CIN2 IFOUT2

Vo

2x5

turns

FILTER

18 dB

attenuator

38.9 MHz

2

V Vmeas

turns

N1/N2 = 5 RMS

voltmeter

modulation

analyzer

50 Ω

MBH050

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

Wanted output signal at fRFW: Vow = 108 dBµV, Vmeas = 92.6 dBµV.

Measuring the level of the unwanted output signal Vou causing 0.3 % AM modulation in the wanted output signal.

Vou = Vmeas + 15.4 dB.

fRFU = fRFW + 5.5 MHz; fosc = fRF + 38.9 MHz.

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

Fig.5 Cross modulation measurement in band C.

handbook, full pagewidtuhnwanted

signal

source 50 Ω

AC

CIN1

LO1

eu Vmeas V

50 Ω

50 Ω

HYBRID

BD

Vi D.U.T.

CIN2

LO2

AC

HYBRID

BD

50 Ω

spectrum

analyzer

50 Ω

MBH051

Loss of the hybrid: 1 dB.

In band C: fRFW = 781 MHz. These wanted signals are not used during the measurement.

In band C: fosc = 819.9 MHz.

In band C: fRFU = 820 MHz = fRFW + 5 × 8 MHz − 1 MHz.

Measuring the level of the unwanted signal Viu causing FM sidebands 30 dB below the oscillator carrier at the LO output.

Viu = Vmeas − loss of the hybrid.

Fig.6 N + 5 − 1 MHz pulling measurement in band C.

1996 Nov 7

8

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