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TDA5744 Folha de dados(PDF) 10 Page - NXP Semiconductors

Nome de Peças TDA5744
Descrição Electrónicos  Low power mixers/oscillators for hyperband tuners
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Fabricante Electrônico  PHILIPS [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA5744 Folha de dados(HTML) 10 Page - NXP Semiconductors

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1998 Mar 09
10
Philips Semiconductors
Preliminary specification
Low power mixers/oscillators for
hyperband tuners
TDA5744; TDA5745
Fig.6 Cross modulation measurement in the VHF band.
(1) N1 is 2
× 5 turns.
(2) N2 is 2 turns.
Zi >> 50 Ω⇒ Vi =2 × Vmeas; V’meas =Vo − 16 dB (transformer ratio
and transformer loss).
Wanted input signal Vi =80dBµV at wanted fRF = 45.25 MHz (399.25 MHz).
Measured level of the unwanted output signal Vou causing 1% AM modulation in the wanted output signal;
unwanted fRF = 50.75 MHz (404.75 MHz); Vou =V’meas +16dB.
N1
N2
--------
5
=
handbook, full pagewidth
unwanted
signal
source
eu
ew
50
50
wanted
signal
source
50
MGL275
D.U.T.
18 dB
attenuator
50
o
V
FILTER
38.9 MHz
modulation
analyzer
HYBRID
AC
BD
V
RMS
voltmeter
Vi
AM = 30%
meas
V'
VHFIN
IFOUT1
IFOUT2
C
T
50
V
Vmeas
RMS
voltmeter
(1)
N1
(2)
N2
Fig.7 Cross modulation measurement in the UHF band.
handbook, full pagewidth
unwanted
signal
source
50
50
wanted
signal
source
50
50
MGL276
D.U.T.
18 dB
attenuator
50
o
V
FILTER
38.9 MHz
modulation
analyzer
HYBRID
AC
BD
HYBRID
AC
BD
V
RMS
voltmeter
Vi
AM = 30%
eu
ew
(1)
N1
(2)
N2
UHFIN1 IFOUT1
IFOUT2
UHFIN2
C
T
50
V
Vmeas
RMS
voltmeter
(1) N1 is 2
× 5 turns.
(2) N2 is 2 turns.
Vi =Vmeas; V’meas =Vo − 16 dB (transformer ratio
and transformer loss).
Wanted input signal Vi =70dBµV at fRF = 407.25 MHz (855.25 MHz).
Measured level of the unwanted output signal Vou causing 1% AM modulation in the wanted output signal;
unwanted fRF = 412.75 MHz (860.75 MHz); Vou =V’meas +16dB.
N1
N2
--------
5
=


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