TDA5634T Datasheet, PDF (8/20 Pages) NXP Semiconductors – 9 V UHF mixer/oscillator for TV and VCR tuners

Philips Semiconductors
9 V UHF mixer/oscillator for TV and VCR
tuners
Product specification
TDA5634T
handbook, full pag^ueⁿw^widt^ah^nted
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
V_meas = V_o − 15.4 dB (transformer ratio N1/N2 = 5 and transformer loss).
Wanted output signal at f_RFW: V_ow = 108 dBµV, V_meas = 92.6 dBµV.
Measuring the level of the unwanted output signal V_ou causing 0.3 % AM modulation in the wanted output signal.
V_ou = V_meas + 15.4 dB.
f_RFU = f_RFW + 5.5 MHz; f_osc = f_RF + 38.9 MHz.
Filter characteristics: f_c = 38.9 MHz; f_−3dBBW = 1.2 MHz; f_−30dBBW = 2.64 MHz.
Fig.5 Cross modulation measurement in band C.
handbook, full pagewidt^uh^nwanted
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: f_RFW = 781 MHz. These wanted signals are not used during the measurement.
In band C: f_osc = 819.9 MHz.
In band C: f_RFU = 820 MHz = f_RFW + 5 × 8 MHz − 1 MHz.
Measuring the level of the unwanted signal V_iu causing FM sidebands 30 dB below the oscillator carrier at the LO output.
V_iu = V_meas − loss of the hybrid.
Fig.6 N + 5 − 1 MHz pulling measurement in band C.
1996 Nov 7
8