Discrete time analog signal processing for simultaneous transmit and receive

A system for simultaneous transmit and receive of radio frequency (RF) signals configured to reduce transmit leakage, the system comprising:

• a transmit signal generator configured to generate an RF transmit signal;
• an aperture configured to wirelessly transmit the RF transmit signal and to receive an RF receive signal;
• an analog leakage canceller configured to receive a portion of the RF transmit signal, to receive finite impulse response (FIR) coefficients, and to generate a leakage cancellation signal based on the portion of the RF transmit signal and the FIR coefficients;
• a combiner configured to combine the RF receive signal and the leakage cancellation signal to generate a reduced-noise RF receive signal,
• wherein the leakage canceller comprises:
• a plurality of sample and hold (SH) circuits configured to simultaneously receive the portion of the RF transmit signal, to sample the portion of the RF transmit signal at successive sample times according to a sample clock, and to generate a plurality of sampled analog voltage signals;
• and
• a plurality of programmable analog multipliers coupled to the plurality of SH circuits and configured to multiply the plurality of sampled analog voltage signals by a plurality of binary multiplication factors to generate the leakage cancellation signal.