TDA5630BT datasheet(9/24 Pages) PHILIPS

9 / 24 page

1996 Jun 06

Philips Semiconductors

Product speciﬁcation

9 V VHF and UHF mixer/oscillator for TV

and VCR cable tuners

TDA5630BT

Fig.5 Noise figure measurement in band A.

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

handbook, full pagewidth

MBH046

D.U.T.

INPUT

CIRCUIT

(see Fig. 5)

AIN

GND

IFOUT1

IFOUT2

BNC

RIM

NOISE

METER

NOISE

SOURCE

2 x 5

turns

N1/N2 = 5

Fig.6 Cross modulation measurement in band A.

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

Wanted output signal at fRFW = 300 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 = 305.5 MHz.

Vou =Vmeas + 15.4 dB.

fosc = 338.9 MHz.

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

handbook, full pagewidth

unwanted

signal

source

Ω

wanted

signal

source

Ω

MBH047

D.U.T.

AIN

GND

IFOUT1

IFOUT2

18 dB

attenuator

Ω

N1/N2 = 5

2 x 5

turns

FILTER

38.9 MHz

modulation

analyzer

HYBRID

RMS

voltmeter

AM = 30%

1 kHz

Vmeas

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