Chapter 492

A low power, direct-to-digital IF receiver with variable gain

Walter Strifler


A variable gain amplifier plus analog-to-digital converter (VGA + ADC) combination circuit is described.


IF receiver


LTC2261 14-bit ADC


Modern communication receivers require an ADC to digitize an incoming analog signal for decoding in a suitable FPGA device. The direct-conversion method of receiver design typically performs a single frequency downconversion and an analog-to-digital conversion (ADC) near baseband. While elegant and simple, this receiver architecture has problems with in-band blockers, out-of-band interferers and LO leakage reflections within the receiver itself.

In the face of these ...

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