tda5637bm NXP Semiconductors, tda5637bm Datasheet - Page 14

• Manufacturer Part Number: tda5637bm
• Description: 9 V Vhf Hyperband And Uhf Mixer/oscillator For Tv And Vcr 3-band Tuners
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1996 Dec 02
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 signal V
V
f
Filter characteristics: f
Loss of the hybrid: 1 dB.
In band B: f
In band B: f
In band B: f
We measure the level of the unwanted signal V
V
RFU
ou
iu
e
e
meas
w
u
= V
= V’
= f
50
50
= V
meas
RFW
meas
o
AM = 30%
unwanted
RFW
osc
RFU
+ 5.5 MHz; f
wanted
source
source
loss of the hybrid.
signal
signal
= 429.9 MHz (in band C: f
50
------------------ -
= 430 MHz = f
= 391 MHz (in band C: f
50
------------------ -
unwanted
signal
source
50
+
50
+
e u
27
27
c
A
B
HYBRID
= 38.9 MHz, f
osc
RFW
50
+ 15.4 dB.
V meas
15.4 dB (transformer ratio
= f
: V
RF
RFW
C
D
ow
+ 38.9 MHz.
50
+ 5
=104 dB V.
Fig.11 N+5-1 MHz pulling measurement in bands B and C.
V
Fig.10 Cross modulation measurement in bands B and C.
3dBBW
RFW
8 MHz
osc
V IMB
(V IMC )
50
50
= 819.9 MHz).
= 1.2 MHz, f
50
= 781 MHz). These wanted signals are not used during the measurement.
ou
iu
1 MHz. (in band C: f
causing fm sidebands 30 dB below the oscillator carrier at the LO output.
A
B
HYBRID
causing 0.3% AM modulation in the wanted output signal.
N1
------- -
N2
A
B
HYBRID
C
D
30dBBW
= 5 and transformer loss).
C
D
= 2.64 MHz.
RFB
(RFC)
RFB
(RFC)
V i
D.U.T.
RFU
14
= 820 MHz = f
CIN1
CIN2
D.U.T.
out
out
IF
IF
LO1
LO2
V
RFW
o
turns
2 x 5
+ 5
N1/N2 = 5
8 MHz
A
B
HYBRID
2
turns
TDA5636B; TDA5637B
27
1 MHz).
voltmeter
C
D
RMS
V
attenuator
18 dB
50
50
spectrum
analyzer
MBH051
38.9 MHz
FILTER
Product specification
modulation
analyzer
50
MGC509