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Abstract

An oscillator/multiply-accumulator AID converter (100) which simultaneously provides frequency downconversion, band pass filtering and analog-to-digital conversion of an analog signal, where the analog signal includes a carrier wave modulated with information by any known modulation technique. The converter (100) uses a superconducting, Josephson single flux quantum circuit operating as a voltage controlled oscillator (102). The voltage controlled oscillator (102) receives the analog signal to be converted, and generates a series of sharp, high frequency pulses based on the characteristics of the carrier signal. The series of pulses are applied to a gate circuit (104) that either passes or blocks the pulses depending on a gate control signal (103). When the pulses are passed by the gate circuit (104), a multiply-accumulator (106) multiplies the pulse by a binary coefficient (109) and accumulates the products (111) resulting from the multiplication during a predetermined time period. The predetermined time period includes at least one sampling period. Each sample is multiplied by a different weight and their products (111) are accumulated. This operation eliminates the DC response, and leads to an improved frequency response.

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First Claim