TDA6650TT; TDA6651TT
NXP Semiconductors
5 V mixer/oscillator and low noise PLL synthesizer
signal
LBIN
or
source
50 Ω
27 Ω
IFOUTA
spectrum
analyzer
MBIN
DUT
V
e
meas
V
50 Ω
V'
meas
50 Ω
V
V
i
o
IFOUTB
RMS
voltmeter
V
CCA
fce747
Zi >> 50 Ω → Vi = 2 × Vmeas = 70 dBµV.
Vi = Vmeas + 6 dB = 70 dBµV.
Vo = V’meas + 3.75 dB.
Vo
G = 20log
------
v
Vi
DVB-T and PAL.
IF = 38.9 MHz.
Fig 14. Gain (GV) measurement in low and mid band with asymmetrical IF output
signal
50 Ω source
LBIN
or
transformer
IFOUTA
spectrum
analyzer
MBIN
V
DUT
N1
N2
V'
meas
C
e
50 Ω
50 Ω
V
V
i
V
o
meas
IFOUTB
RMS
voltmeter
fce748
Zi >> 50 Ω → Vi = 2 × Vmeas = 70 dBµV.
Vi = Vmeas + 6 dB = 70 dBµV.
Vo = V’meas + 15 dB (transformer ratio N1/N2 = 5 and transformer loss).
Vo
G = 20log
------
v
Vi
N1 = 10 turns.
N2 = 2 turns.
N1/N2 = 5.
DVB-T and PAL.
IF = 38.9 MHz.
Fig 15. Gain (GV) 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
34 of 54
NXP [ NXP ]
