TDA6405ATS datasheet(16/32 Pages) PHILIPS

16 / 32 page

1999 Jan 13

Philips Semiconductors

Product speciﬁcation

5 V mixer/oscillator-PLL synthesizers for

hyperband tuners

TDA6404; TDA6405;

TDA6405A

Fig.6 Cross modulation measurement in the VHF band.

(1) N1 is 2

× 5 turns

(2) N2 is 2 turns

Zi >> 50 Ω⇒ Vi =2 × Vmeas; V’meas =Vo − 16 dB (transformer ratio

and transformer loss)

Wanted input signal Vi =80dBµV at wanted fRF = 45.25 MHz (399.25 MHz).

Measured level of the unwanted output signal Vou causing 0,3% AM modulation in the wanted output signal;

unwanted fRF = 50.75 MHz (404.75 MHz); Vou =V’meas +16dB.

--------

handbook, full pagewidth

unwanted

signal

source

Ω

wanted

signal

source

Ω

MGL275

D.U.T.

18 dB

attenuator

Ω

FILTER

38.9 MHz

modulation

analyzer

HYBRID

RMS

voltmeter

AM = 30%

meas

VHFIN

IFOUT1

IFOUT2

Ω

Vmeas

RMS

voltmeter

(1)

(2)

Fig.7 Cross modulation measurement in the UHF band.

(1) N1 is 2

× 5 turns

(2) N2 is 2 turns

Vi =Vmeas; V’meas =Vo − 16 dB (transformer ratio

and transformer loss)

Wanted input signal Vi =70dBµV at fRF = 407.25 MHz (855.25 MHz).

Measured level of the unwanted output signal Vou causing 0,3% AM modulation in the wanted output signal;

unwanted fRF = 412.75 MHz (860.75 MHz); Vou =V’meas +16dB.

--------

handbook, full pagewidth

unwanted

signal

source

Ω

wanted

signal

source

Ω

MGL276

D.U.T.

18 dB

attenuator

Ω

FILTER

38.9 MHz

modulation

analyzer

HYBRID

RMS

voltmeter

AM = 30%

(1)

(2)

UHFIN1 IFOUT1

IFOUT2

UHFIN2

Ω

Vmeas

RMS

voltmeter

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