|
ATMEL Corporation |
Features
• On-chip Control Functions are Available for System Gain Adjust
(dB Linear versus DC Current)
• Low Noise LO Design
• ESD Protected
Benefits
• All Front-end Functions of a High-performance FM Receiver Except the RF
Preamplifier are Integrated
• Improved Dynamic Range by High Current Double-balanced Mixer Design and a New
AGC Conception with 3 Loops On-chip
• Improved Blocking and Intermod Behavior Due to a Unique “Interference” Sensor
Controlling the AGC
• Easy Cascading of 3 IF Filters (Ceramic) Enabled by Two On-chip IF Preamplifiers
FM Receiver IC
U4065B
Description
The IC U4065B is a bipolar integrated FM front-end 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.
Rev. 4807A–AUDR–05/04
Figure 1. Block Diagram
ANT
RF tank
PIN
ATT
VS
IF tank
19 18
16
14
Mixer
IF BPF
IF gain adjust
IF BPF
20 21 4 7
IF 1
VS
53
IF output
IF BPF
2
IF 2
RF tank
VTUNE
RF
NC 12
Interference
mixer
LO tank
23
Local
24 oscillator
AGC
wide band
and IF
IF and
detector
22 1
LO output
11 9
Interference
IF BPF
8 10
13
AGC adjust
(wide band)
Voltage
regulator
17
6
+
VS
VREF = 4 V
AGC level
VS
2 U4065B
4807A–AUDR–05/04
|