TDA6650TT; TDA6651TT
NXP Semiconductors
5 V mixer/oscillator and low noise PLL synthesizer
signal
source
50 Ω
27 Ω
A
HBIN1
HBIN2
C
IFOUTA
spectrum
analyzer
DUT
HYBRID
V
V
V'
meas
e
o
50 Ω
V
50 Ω
V
i
meas
IFOUTB
B
D
50 Ω
RMS
voltmeter
V
CCA
fce751
Loss in hybrid = 1 dB.
Vi = Vmeas − loss = 70 dBµV.
Vo = V’meas + 3.75 dB.
Vo
G = 20log
.
------
v
Vi
DVB-T and PAL.
IF = 38.9 MHz.
Fig 20. Gain (GV) measurement in high band with asymmetrical IF output
signal
source
50 Ω
transformer
C
D
HBIN1
HBIN2
IFOUTA
A
spectrum
analyzer
DUT
HYBRID
V
meas
C
N1
N2
V'
V
i
50 Ω
e
V
50 Ω
V
o
meas
B
IFOUTB
50 Ω
RMS
voltmeter
fce752
Loss in hybrid = 1 dB.
Vi = Vmeas − loss = 70 dBµV.
Vo = V’meas + 15 dB (transformer ratio N1/N2 = 5 and transformer loss).
Vo
G = 20log
.
------
v
Vi
DVB-T and PAL.
IF = 38.9 MHz.
Fig 21. Gain (GV) 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
37 of 54
NXP [ NXP ]
