A GaAs phase digitizing and summing system for microwave signal storage

The analysis, design, and development of a microwave signal storage prototype system using phase-quantization sampling are described. A GaAs 4-bit D/A converter has been demonstrated in a 3-bit DRFM (digital RF memory) prototype system with digital Si emitter-coupled logic (ECL) and RF microwave components at a sample rate of 200 MHz and exhibiting typically a -17-dBc harmonic suppression. A monolithic GaAs A/D and D/A converter has been demonstrated within an RF signal acquisition system. Performance data on the monolithic sampler reveal that the 3-bit quantization system exhibits signal reconstruction with harmonic suppression exceeding 25 dB across an IF bandwidth of greater than 900 MHz.>