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參數(shù)資料
| 型號(hào)： | TDA5745TS |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 衰減器 |
| 英文描述： | DIODE: SCHOTTKY, 60V, 1A, PACKAGE SMA |
| 中文描述： | RF/MICROWAVE DOUBLE BALANCED MIXER |
| 文件頁(yè)數(shù)： | 10/20頁(yè) |
| 文件大?。?/td> | 123K |
| 代理商： | TDA5745TS |
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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.
Z
i
>> 50
V
i
= 2
×
V
meas
; V’
meas
= V
o
16 dB (transformer ratio
and transformer loss).
Wanted input signal V
i
= 80 dB
μ
V at wanted f
RF
= 45.25 MHz (399.25 MHz).
Measured level of the unwanted output signal V
ou
causing 1% AM modulation in the wanted output signal;
unwanted f
RF
= 50.75 MHz (404.75 MHz); V
ou
= V’
meas
+ 16 dB.
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
A
C
B
D
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
A
C
B
D
HYBRID
A
C
B
D
V
RMS
voltmeter
Vi
AM = 30%
eu
ew
(1)
N1
C
(2)
N2
UHFIN1 IFOUT1
IFOUT2
UHFIN2
T
50
V
Vmeas
RMS
voltmeter
(1) N1 is 2
×
5 turns.
(2) N2 is 2 turns.
V
i
= V
meas
; V’
meas
= V
o
16 dB (transformer ratio
and transformer loss).
Wanted input signal V
i
= 70 dB
μ
V at f
RF
= 407.25 MHz (855.25 MHz).
Measured level of the unwanted output signal V
ou
causing 1% AM modulation in the wanted output signal;
unwanted f
RF
= 412.75 MHz (860.75 MHz); V
ou
= V’
meas
+ 16 dB.
N2
5
=
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