tda5631t NXP Semiconductors, tda5631t Datasheet - Page 13

• Manufacturer Part Number: tda5631t
• Description: 9 V Vhf, Hyperband And Uhf Mixer/oscillator For Tv And Vcr 3-band Tuners
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1996 Mar 21
handbook, full pagewidth
handbook, full pagewidth
9 V VHF, hyperband and UHF
mixer/oscillator for TV and VCR 3-band tuners
V
Wanted output signal at f
We measure the level of the unwanted output signal V
V
f
Filter characteristics: f
Loss of the hybrid: 0.8 to 1 dB depending on frequency.
In band B: f
In band B: f
In band B: f
We measure the level of the unwanted signal V
V
RFU
e
meas
ou
iu
e
u
w
= V
= V
= f
50
50
= V
meas
RFW
meas
o
AM = 30%
unwanted
RFW
osc
RFU
+ 5.5 MHz; f
+ 15.4 dB.
wanted
source
15.4 dB (transformer ratio N1/N2 = 5 and transformer loss).
source
signal
1 kHz
loss of the hybrid.
signal
= 429.9 MHz (in band C: f
= 430 MHz = f
= 391 MHz (in band C: f
unwanted
signal
source
e u
c
A
B
HYBRID
= 38.9 MHz; f
osc
RFW
50
V meas
= f
: V
RF
RFW
C
D
ow
+ 38.9 MHz.
Fig.11 N + 5
50
+ 5
= 108 dB V, V
V
Fig.10 Cross modulation measurement in bands B and C.
3dBBW
RFW
8 MHz
osc
50
50
= 819.9 MHz).
= 1.2 MHz; f
= 781 MHz). These wanted signals are not used during the measurement.
50
iu
meas
1 MHz.(in band C: f
causing fm sidebands 30 dB below the oscillator carrier at the LO output.
A
B
HYBRID
A
B
HYBRID
1 MHz pulling measurement in bands B and C.
= 92.6 dB V.
ou
C
D
causing 0.3 % AM modulation in the wanted output signal.
30dBBW
C
D
= 2.64 MHz.
BIN1
(CIN1)
BIN2
(CIN2)
V i
RFU
D.U.T.
= 820 MHz = f
BIN1
(CIN1)
BIN2
(CIN2)
13
IFOUT1
IFOUT2
D.U.T.
LO1
LO2
RFW
V
o
2 x 5
turns
+ 5
N1/N2 = 5
8 MHz
A
B
HYBRID
2
turns
1 MHz).
voltmeter
C
D
RMS
V
attenuator
18 dB
V meas
50
50
spectrum
analyzer
MBH051
38.9 MHz
FILTER
Product specification
TDA5630;
TDA5631
modulation
analyzer
50
MBH050