tda5737a NXP Semiconductors, tda5737a Datasheet - Page 11

• Manufacturer Part Number: tda5737a
• Description: Tda5737a 5 V Vhf, Hyperband And Uhf Mixers/oscillators For Tv And Vcr 3-band Tuners
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2000 Dec 19
handbook, full pagewidth
handbook, full pagewidth
5 V VHF, hyperband and UHF
mixers/oscillators for TV and VCR 3-band tuners
V’
Wanted output signal at f
We measure the level of the unwanted signal V
f
V
Filter characteristics: f
The ripple susceptibility is defined as the level of a signal added to the supply voltage causing sidebands in the LO output at 53.5 dBc.
This signal has a frequency between 20 Hz and 500 kHz.
osc
ou
meas
= 83.9 MHz (203.9 MHz).
= V’
= V
meas
e w
o
e u
+ 15.4 dB.
15.4 dB (transformer ratio N1/N2 = 5 and transformer loss).
50
50
DC supply
100 F
AM = 30%
unwanted
source
wanted
c
signal
source
signal
= 33.9 MHz; f
RFW
= 50 MHz (170 MHz); V
6.8 k
signal
ripple
A
B
HYBRID
3dBBW
C
D
100 F
Fig.6 Cross modulation measurement in band A.
= 1 MHz; f
ou
47
50
causing 1% AM modulation in the wanted output signal; f
V IMA
V P
ow
30dBBW
= 80 dB V.
Fig.7 Ripple susceptibility.
L10, C25, C35, C26
RFA
MEASUREMENT
REFERENCE
OF FIG. 17
WITHOUT
D.U.T.
= 2.3 MHz.
SET-UP
out
out
IF
IF
11
V
o
turns
2 x 5
spectrum
analyser
N1/N2 = 5
to
2
turns
500 kHz
voltmeter
RMS
V
attenuator
RFU
18 dB
V'
f o
meas
= 45.5 MHz (165.5 MHz);
33.9 MHz
FILTER
500 kHz
Preliminary specification
53.5 dBc
TDA5737A
MGE974
modulation
analyzer
50
MGE972