TDA5634T Philips Semiconductors, TDA5634T Datasheet - Page 8

• Manufacturer Part Number: TDA5634T
• Description: 9 V UHF mixer/oscillator for TV and VCR tuners
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1996 Nov 7
handbook, full pagewidth
handbook, full pagewidth
9 V UHF mixer/oscillator for TV and VCR
tuners
V
Wanted output signal at f
Measuring the level of the unwanted output signal V
V
f
Filter characteristics: f
Loss of the hybrid: 1 dB.
In band C: f
In band C: f
In band C: f
Measuring the level of the unwanted signal V
V
RFU
e
meas
ou
iu
e
w
u
= V
= V
= f
50
50
= V
meas
RFW
meas
o
AM = 30%
unwanted
RFW
osc
RFU
+ 5.5 MHz; f
+ 15.4 dB.
source
wanted
source
15.4 dB (transformer ratio N1/N2 = 5 and transformer loss).
signal
1 kHz
loss of the hybrid.
signal
= 819.9 MHz.
= 820 MHz = f
unwanted
signal
source
= 781 MHz. These wanted signals are not used during the measurement.
e u
c
A
HYBRID
B
= 38.9 MHz; f
osc
RFW
50
V meas
= f
: V
RF
RFW
C
D
ow
+ 38.9 MHz.
50
= 108 dB V, V
+ 5
V
3dBBW
Fig.6 N + 5
8 MHz
50
Fig.5 Cross modulation measurement in band C.
50
= 1.2 MHz; f
50
iu
causing FM sidebands 30 dB below the oscillator carrier at the LO output.
1 MHz.
meas
A
B
HYBRID
ou
A
B
HYBRID
= 92.6 dB V.
causing 0.3 % AM modulation in the wanted output signal.
C
D
30dBBW
1 MHz pulling measurement in band C.
C
D
= 2.64 MHz.
CIN1
CIN2
V i
D.U.T.
CIN1
CIN2
8
IFOUT1
IFOUT2
D.U.T.
LO1
LO2
V
o
2 x 5
turns
N1/N2 = 5
A
B
HYBRID
2
turns
voltmeter
C
D
RMS
V
attenuator
18 dB
V meas
50
50
spectrum
analyzer
MBH051
38.9 MHz
FILTER
Product specification
TDA5634T
modulation
analyzer
50
MBH050