U4065B
FM Receiver
Description
The IC U4065B is a bipolar integrated FM-frontend
circuit. It contains a mixer, an oscillator, two IF
preamplifiers and an unique interference sensor. The
device is designed for high performance car radio and
home receiver applications.
Features
D
All frontend functions of a high performance FM-
receiver, except the RF preamplifier, are integrated
D
Easy cascading of three IF filters (ceramic) by use of
two on-chip IF preamplifiers
D
Improved dynamic range by high current double
balanced mixer design and a new AGC conception
with 3 loops on chip
D
On-chip control functions are available for system
gain adjust (dB linear vs. dc current)
D
Improved blocking and intermod behavior by use of
an unique “interference” sensor controlling the AGC
D
Low noise LO design
D
ESD protected
Block Diagram
ANT
V
S
IF tank
IF BPF
IF gain adjust
IF BPF
IF outp
IF BPF
RF tank
16
14
15
19
18
20
21 4 7
5
3
V
S
2
Mixer
IF 1
IF 2
PIN
ATT
AGC
RF
RF tank
D.N.C.
12
Inter-
ference
mixer
wide band
& IF
13
AGC adjust
(wide band)
V
ref
= 4 V
LO tank
IF&
23
24
Local
oscill.
detector
Voltage
reg.
17
22
1
11
Interference
IF BPF
9
8
10
6
+
V
S
LO output
V
tune
V
S
AGC level
94 8768
Rev. A3, 15-Oct-98
1 (23)
TEMIC [ TEMIC SEMICONDUCTORS ]
