TELEFUNKEN Semiconductors
U2791B
1000 MHz Quadrature Demodulator
Description
U2791B silicon monolithic integrated circuit is a
quadrature demodulator that is manufactured using
TELEFUNKEN’s advanced UHF technology. This
demodulator features a frequency range from
100 – 1000 MHz, low current consumption, selectable
gain, power down mode and is adjustment free. The IC is
suitable for direct conversion and image rejection
applications in digital radio systems up to 1 GHz such as
cellular radio, cordless telephone, cable TV and satellite
TV systems.
Features
D
Supply voltage 5 V (typ.)
D
Very low power consumption 125 mW (typ.)
D
Very good image rejection by means of phase control
loop for precise 90° phase shifting
D
Duty cycle regeneration for single ended LO input
signal
D
D
D
D
Low LO input level –10 dBm (typ.)
LO – frequency from 100 MHz to 1 GHz
Power down mode
25 dB gain control
Block Diagram
V
S
5,6
Power
down
PD
14
IIX
4
II
3
1 IX
OUTPUT
2 I
7
RFin
8
90°Control
loop
0°
90°
Frequency
doubler
Duty cycle
regenerator
17 LO
13 PC
12 PCX
Q
19
OUTPUT
20 QX
11
GC
15,16,18
GND
10
QQX
9
QQ
95 9755
Rev. A2: 08.06.1995
1 (11)
TEMIC [ TEMIC SEMICONDUCTORS ]
