TDA6650TT; TDA6651TT
NXP Semiconductors
5 V mixer/oscillator and low noise PLL synthesizer
NOISE
FIGURE
METER
27 Ω
NOISE
SOURCE
A
HBIN1 IFOUTA
C
HYBRID
DUT
B
D
IFOUTB
HBIN2
50 Ω
V
CCA
fce753
Loss in hybrid = 1 dB.
NF = NFmeas − loss.
Fig 22. Noise figure (NF) measurement in high band with asymmetrical IF output
FILTER
AM = 30 %
1 kHz
10 dB
attenuator
50 Ω
27 Ω
A
A
C
C
HBIN1
IFOUTA
IFOUTB
modulation
analyzer
unwanted
signal
source
e
u
38.9 MHz
HYBRID
HYBRID
DUT
V
o
V
50 Ω
V
meas
50 Ω
B
D
B
D
HBIN2
wanted
signal
source
e
w
50 Ω
50 Ω
V
CCA
RMS
voltmeter
fce754
Wanted signal source at fRFpix is 70 dBµV.
Unwanted output signal at fsnd
.
The level of unwanted signal is measured by causing 0.3 % AM modulation in the wanted signal.
Fig 23. Cross modulation measurement in high band with asymmetrical IF output
FILTER
6 dB
attenuator
AM = 30 %
1 kHz
transformer
50 Ω
A
C
A
C
HBIN1 IFOUTA
DUT
modulation
unwanted
signal
source
analyzer
e
u
38.9 MHz
HYBRID
HYBRID
V'
N1
N2
C
V
meas
50 Ω
V
o
50 Ω
B
D
D
HBIN2 IFOUTB
B
wanted
signal
source
e
w
50 Ω
50 Ω
RMS
voltmeter
fce794
V’meas = Vo − (transformer ratio N1/N2 = 5 and loss)
The level of unwanted signal is measured by causing 0.3 % AM modulation in the wanted signal.
N1 = 10 turns.
N2 = 2 turns.
N1/N2 = 5.
Fig 24. Cross modulation measurement in high band with symmetrical IF output
TDA6650TT_6651TT_5
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 05 — 10 January 2007
38 of 54
NXP [ NXP ]
