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TDA5630BT Datasheet, PDF (11/24 Pages) NXP Semiconductors – 9 V VHF and UHF mixer/oscillator for TV and VCR cable tuners | |||
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Philips Semiconductors
9 V VHF and UHF mixer/oscillator for TV
and VCR cable tuners
Product speciï¬cation
TDA5630BT
handbook, full paguenwwidtahnted
signal
50 ⦠source
AC
AM = 30%
eu
1 kHz
HYBRID
50 â¦
B
ew
wanted
signal
source
D
50
â¦
AC
HYBRID
BD
50
â¦
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 â¦
MBH050
Vmeas = Vo â 15.4 dB (transformer ratio N1/N2 = 5 and transformer loss).
Wanted output signal at fRFW: Vow = 108 dBµV, Vmeas = 92.6 dBµV.
We measure 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; fâ3dBBW = 1.2 MHz; fâ30dBBW = 2.64 MHz.
Fig.9 Cross modulation measurement in band C.
handbook, full pagewidtuhnwanted
signal
source 50 â¦
AC
CIN1
LO1
eu Vmeas V
50 â¦
50 â¦
HYBRID
BD
Vi D.U.T.
CIN2
LO2
AC
HYBRID
BD
50 â¦
spectrum
analyzer
50 â¦
MBH051
Loss of the hybrid: 1 dB.
fRFW = 781 MHz. This wanted signal is not used during the measurement.
fosc = 819.9 MHz.
fRFU = 820 MHz = fRFW + 5 Ã 8 MHz â 1 MHz.
We measure the level of the unwanted signal Viu causing FM sidebands 30 dB below the oscillator carrier at the LO output.
Viu = Vmeas â loss of the hybrid.
Fig.10 N + 5 â 1 MHz pulling measurement in band C.
1996 Jun 06
11
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