CN-0140 Datasheet, PDF (1/4 Pages) Analog Devices – High Performance, Dual Channel IF Sampling Receiver

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Circuit Note
CN-0140
Devices Connected/Referenced
ADL5356
1.2 GHz to 2.5 GHz, Dual-Balanced Mixer,
LO Buffer, IF Amplifier, and RF Balun
AD8376
Ultralow Distortion IF Dual VGA
AD9258
14-Bit, 125 MSPS, 1.8 V Dual ADC
AD9517-4
12-Output Clock Generator with
Integrated 1.6 GHz VCO
High Performance, Dual Channel IF Sampling Receiver
CIRCUIT FUNCTION AND BENEFITS
CIRCUIT DESCRIPTION
This circuit is a high performance, dual channel IF sampling
receiver, also called a “main” and “diversity” receiver in
base station terminology. The downconverting receiver uses
a single IF frequency of 153.6 MHz and includes a dual
downconverting mixer, digitally controlled dual VGA, dual
ADC, and clock synthesizer. The circuit takes an incoming
RF waveform and outputs a dual 14-bit resolution digital data
stream. It is optimized for high frequency IF sampling and
provides exceptional spurious-free dynamic range (SFDR)
performance of 79.61 dBc with a sampling rate of 122.88 MSPS
at the high gain setting.
This circuit includes the RF front end, as well as the IF sampling
receiver. It is composed of a dual balanced mixer, broadband IF
SAW filter, digitally controlled dual VGA, and dual ADC. The
circuit also includes a synthesizer, which generates the ADC
sampling clock.
The ADL5356 dual balanced mixer is designed to downconvert
radio frequencies (RF) primarily between 1200 MHz and
2500 MHz to lower intermediate frequencies (IF) between
30 MHz and 450 MHz.
5V
153.6MHz
5V
330nH
18pF
EPCOS
B5206
SAW FILTER
18pF
5V _1µH
72nH
1/2
58nH _AD8376
470pF _330nH
309Ω 3.3pF
18pF
5V
F_C = 153.6MHz
BW = 20MHz
330nH
18pF
5
1µH
A0 TO
A4
5V
330nH
470pF
330nH
20pF
330nH
CML
1.8V 1.8V
AVDD DVDD
33Ω
165Ω
56nH
165Ω
1/2
14
AD9258
33Ω _{CML CLK+ CLK–}
3V
122.88MHz
22pF
IN
1.21kΩ
GM
50Ω
RF IN
1950MHz
10nF
CT
10pF
1/2
ADL5356
ON
OP
390Ω
5V
LG
LOI2
22pF
50Ω
LOSW
50Ω
REF IN
30.72MHz
LO IN
1796.4MHz
0.1µF
1:1
57.6Ω
0.1µF
0.1µF
AD9517-4
REFIN OUT0
REFIN
CP
OUT0
BYPASS
LF
1.5kΩ
0.1µF
200Ω
200Ω
0.1µF
470pF
430Ω
10nF
100pF
0.22µF
NOTES
1. ALL PINS AND CONNECTIONS TO ADL5356, AD8376, AD9258 AND AD9417 NOT SHOWN.
CONSULT PRODUCT DATA SHEETS FOR DETAILED INFORMATION.
Figure 1. Broadband Dual Channel IF Sampling Receiver (Simplified Schematic: Only One-Half of the Receiver Is Shown. All Connections and Decoupling Not Shown)
Rev. 0
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