TDA5745 PHILIPS [NXP Semiconductors], TDA5745 Datasheet - Page 10

• Manufacturer Part Number: TDA5745
• Description: Low power mixers/oscillators for hyperband tuners
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
1998 Mar 09
handbook, full pagewidth
handbook, full pagewidth
Low power mixers/oscillators for
hyperband tuners
(1) N1 is 2
(2) N2 is 2 turns.
Z
Wanted input signal V
Measured level of the unwanted output signal V
unwanted f
(1) N1 is 2
(2) N2 is 2 turns.
V
Wanted input signal V
Measured level of the unwanted output signal V
unwanted f
i
i
e w
e u
>> 50
= V
meas
50
50
e w
e u
; V’
RF
RF
AM = 30%
unwanted
wanted
source
meas
source
= 50.75 MHz (404.75 MHz); V
signal
signal
= 412.75 MHz (860.75 MHz); V
5 turns.
V
5 turns.
50
50
i
= 2
= V
AM = 30%
unwanted
source
wanted
source
o
signal
i
i
signal
V
= 80 dB V at wanted f
= 70 dB V at f
A
B
HYBRID
meas
16 dB (transformer ratio
; V’
C
D
meas
A
B
HYBRID
V meas
50
= V
Fig.6 Cross modulation measurement in the VHF band.
Fig.7 Cross modulation measurement in the UHF band.
RF
C
D
o
= 407.25 MHz (855.25 MHz).
V meas
V i
16 dB (transformer ratio
ou
V
50
ou
RF
= V’
ou
ou
= V’
50
= 45.25 MHz (399.25 MHz).
A
HYBRID
B
V i
N1
------- -
N2
causing 1% AM modulation in the wanted output signal;
causing 1% AM modulation in the wanted output signal;
meas
voltmeter
meas
50
V
RMS
=
+ 16 dB.
+ 16 dB.
5
C
D
VHFIN IFOUT1
and transformer loss).
voltmeter
50
RMS
D.U.T.
UHFIN1 IFOUT1
UHFIN2
IFOUT2
N1
------- -
N2
D.U.T.
=
10
5
IFOUT2
and transformer loss).
V
o
V
C
o
N1
(1)
C
T
N1
(1)
N2
(2)
T
voltmeter
N2
(2)
RMS
V
attenuator
voltmeter
18 dB
TDA5744; TDA5745
RMS
V'
V
meas
attenuator
18 dB
38.9 MHz
FILTER
Preliminary specification
38.9 MHz
FILTER
modulation
analyzer
50
MGL275
modulation
analyzer
50
MGL276