Direct digital downconverter based on an oscillator/counter anal

Details Direct digital downconverter based on an oscillator/counter anal Direct digital downconverter based on an oscillator/counter anal

1998-07-31

2000-10-03

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341133, H03M 160

Patent

active

061279609

ABSTRACT:
A control scheme for operating an oscillator/counter A/D converter (10) so that it 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 (10) uses a superconducting, Josephson single flux quantum circuit operating as a voltage controlled oscillator (12). The voltage controlled oscillator (12) 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 (14) that either passes or blocks the pulses depending on a gate control signal. When the pulses are passed by the gate circuit (14), a counter circuit (16) accumulates the pulses during a sampling period. The sampling period covers a range of gate control pulses so that the accumulation of pulses defines consecutive on/off periods of the gate control signal. Each time the gate control signal passes the pulses from the variable controlled oscillator (12), the converter (10) effectively performs a bit multiplication that gives the frequency conversion.

REFERENCES:
patent: 3678500 (1972-07-01), Bauer
patent: 4983971 (1991-01-01), Przybysz et al.
L. R. Eaton, et al., "Design of a 10 K NbN A/D Converter for IR Focal Plane Array Sensors," IEEE Transactions on Applied Superconductivity, 5, 2457 (1995).

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