TDA6650TT; TDA6651TT
NXP Semiconductors
5 V mixer/oscillator and low noise PLL synthesizer
FILTER
10 dB
attenuator
AM = 30 %
1 kHz
LBIN
or
MBIN
50 Ω
27 Ω
A
C
IFOUTA
modulation
analyzer
unwanted
signal
source
e
u
38.9 MHz
V
o
HYBRID
DUT
V
meas
50 Ω
V
50 Ω
IFOUTB
B
D
wanted
signal
e
w
50 Ω
RMS
voltmeter
V
CCA
source
fce749
Vo = Vmeas + 3.75 dB.
Wanted signal source at fRFpix is 80 dBµV.
Unwanted output signal at fsnd
.
The level of unwanted signal is measured by causing 0.3 % AM modulation in the wanted signal.
Fig 18. Cross modulation measurement in low and mid band with asymmetrical IF output
FILTER
6 dB
attenuator
AM = 30 %
1 kHz
LBIN
or
MBIN
50 Ω
transformer
A
IFOUTA
C
modulation
analyzer
unwanted
signal
e
u
38.9 MHz
source
HYBRID
C
N2
DUT
N1
o
V
V'
meas
50 Ω
V
50 Ω
B
D
IFOUTB
wanted
signal
e
w
RMS
voltmeter
source
50 Ω
fce793
V’meas = Vo − (transformer ratio N1/N2 = 5 and loss).
Wanted signal source at fRFpix is 80 dBµV.
The level of unwanted signal Vo at fsnd is measured by causing 0.3 % AM modulation in the wanted output signal.
N1 = 10 turns.
N2 = 2 turns.
N1/N2 = 5.
Fig 19. Cross modulation measurement in low and mid band with symmetrical IF output
TDA6650TT_6651TT_5
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 05 — 10 January 2007
36 of 54
NXP [ NXP ]
