TELEFUNKEN Semiconductors
U 4270 B
FM IF limiter amplifier and detector
Description
The U 4270 B is an integrated bipolar FM-IF amplifier
circuit with field strength indicator, stop signal generator,
multipath detector and controllable mute function. It is
designed for car radios and home receiver applications.
Features
D
7 stage limiter amplifier
D
Multipath signal detector
D
Stop signal generator with controllable threshold
D
Signal strength output
D
Controllable mute function
D
High signal/noise ratio and low signal distortion
Block Diagram
R
3
1
14 (15)
9 (10)
10 (11)
Mute depth control
3 (4)
4 (5)
8 (9)
18(20)
(19)
17
(8)
7
16 (18)
5 (6)
6
(7)
11 (12)
15 (16) 13 (14)
12 (13)
2
( ) SSO 20
94 8876
Rev. A1: 07.10.1994
Preliminary Information
1
TEMIC [ TEMIC SEMICONDUCTORS ]
