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