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參數(shù)資料
| 型號： | TDA5744 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Low power mixers/oscillators for hyperband tuners |
| 中文描述： | 低功耗混頻器/振蕩器的調(diào)諧器的hyperband |
| 文件頁數(shù)： | 10/20頁 |
| 文件大小： | 123K |
| 代理商： | TDA5744 |
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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