TDA5636B Datasheet, PDF (12/28 Pages) NXP Semiconductors – 9 V VHF hyperband and UHF mixer/oscillator for TV and VCR 3-band tuners

Philips Semiconductors
9 V VHF hyperband and UHF mixer/oscillator for
TV and VCR 3-band tuners
Product specification
TDA5636B; TDA5637B
handbook, full pagewidth
NOISE
SOURCE
BNC
RIM
INPUT
CIRCUIT
(see Fig. 5)
AIN IFOUT1
D.U.T.
GND IFOUT2
TR
NOISE
METER
2x5
turns
2
turns
N1/N2 = 5
MBH046
(1) NF = NF_meas − loss (input circuit) dB.
Fig.6 Noise figure measurement in band A.
unwanted
handbook, full pagewidth ^signal
50 Ω source
AC
AM = 30%
eu
HYBRID
50 Ω
BD
ew
wanted
signal
source
RFA
IF
out
VIMA
50
Ω
D.U.T.
IF
out
Vo
2x5
turns
FILTER
18 dB
27 Ω attenuator
38.9 MHz
2
V ^V'meas
turns
N1/N2 = 5 RMS
voltmeter
modulation
analyzer
50 Ω
MGC508
V’_meas = V_o ×


5----0---5--+_{-0----2---7--}
− 15.4 dB (transformer ratio
NN-----12--
= 5 and transformer loss).
Wanted output signal at f_RFW = 180 MHz: V_ow =104 dBµV.
We measure the level of the unwanted signal V_ou causing 0.3% AM modulation in the wanted output signal; f_RFU = 185.5 MHz.
V_ou = V’_meas ×


5----0---5--+_{-0----2---7--}
+ 15.4 dB.
The cross modulation measurements are done at these frequencies:
- f_RFW = 50.0 MHz; f_RFU = 55.5 MHz; f_osc = 88.9 MHz
- f_RFW = 180.0 MHz; f_RFU = 185.5 MHz; f_osc = 218.9 MHz.
Filter characteristics: f_c = 38.9 MHz, f_−3dBBW = 1.2 MHz, f_−30dBBW = 2.64 MHz.
Fig.7 Cross modulation measurement in band A.
1996 Dec 02
12