AD6650 Diversity IF-to-Baseband
GSM/EDGE Narrow-Band Receiver
AD6650
Smart antenna systems
FEATURES
116 dB dynamic range
Software radios
In-building wireless telephony
Digital VGA
I/Q demodulators
Active low-pass filters
PRODUCT DESCRIPTION
The AD6650 is a diversity intermediate frequency-to-baseband
(IF-to-baseband) receiver for GSM/EDGE. This narrow-band
receiver consists of an integrated DVGA, IF-to-baseband I/Q
demodulators, low-pass filtering, and a dual wideband ADC.
The chip can accommodate IF input from 70 MHz to 260 MHz.
The receiver architecture is designed such that only one external
surface acoustic wave (SAW) filter for main and one for diversity
are required in the entire receive signal path to meet GSM/EDGE
blocking requirements.
Dual wideband ADC
Programmable decimation and channel filters
VCO and phase-locked loop circuitry
Serial data output ports
Intermediate frequencies of 70 MHz to 260 MHz
10 dB noise figure
+43 dBm input IP2 at 70 MHz IF
−9.5 dBm input IP3 at 70 MHz IF
3.3 V I/O and CMOS core
Microprocessor interface
JTAG boundary scan
Digital decimation and filtering circuitry provided on-chip
remove unwanted signals and noise outside the channel of
interest. Programmable RAM coefficient filters allow antialiasing,
matched filtering, and static equalization functions to be combined
in a single cost-effective filter. The output of the channel filters
is provided to the user via serial output I/Q data streams.
APPLICATIONS
PHS or GSM/EDGE single carrier, diversity receivers
Microcell and picocell systems
Wireless local loop
FUNCTIONAL BLOCK DIAGRAM
TWEAK GAIN
AD6650 GSM/
EDGE IF RECEIVER
DAC
I
AGC
RELIN
CTRL
LP
FILTER
LPF
LPF
TH
TH
4
7
PROG.
FIR
(RCF)
AIN
AIN
FINE
DCC
12-BIT
ADC
COARSE
DCC
ORDER
CIC
ORDER
IIR
MUX
Q
BIST
VGA
SCLK
SDFS
SDO0
CPOUT
LF
0
PLL/
VCO
SERIAL
PORT
/4
REF
90
VLDO
SDO1
DR
Q
LPF
LPF
TH
4
ORDER
CIC
TH
7
ORDER
IIR
PROG.
FIR
(RCF)
BIN
BIN
FINE
DCC
12-BIT
ADC
COARSE
DCC
VGA
MUX
BIST
I
AGC
RELIN
CTRL
LP
FILTER
DAC
TWEAK GAIN
CLK
DIVIDER
JTAG
MICRO
Figure 1.
Rev. A
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