Recirculating A/D or D/A converter with single reference voltage

Details Recirculating A/D or D/A converter with single reference voltage Recirculating A/D or D/A converter with single reference voltage

1998-02-27

2000-01-18

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341172, H03M 138

Patent

active

060161159

ABSTRACT:
The converter has a three decision range conversion algorithm using ternary values. The converter has a single unipolar reference voltage source (Vr) and computing method (MC) to establish a voltage value. The voltage value is determined by determining a sum value from the voltage calculated during the previous iteration, and a value which is the product of the ternary value during the preceding iteration and the reference voltage. Computing is by switched capacitors (Cr, C1, C2) connected to a single operational amplifier (11). This provides a more compact circuit with less surface integration having a smaller current requirement whilst having a good conversion quality for applications such as hearing aids.

REFERENCES:
patent: 4692738 (1987-09-01), Suzuki
patent: 4743885 (1988-05-01), Kobayahsi
patent: 5212486 (1993-05-01), Nagaraj
patent: 5510789 (1996-04-01), Lee

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