A/D converter with charge-redistribution DAC and split summation

Details A/D converter with charge-redistribution DAC and split summation A/D converter with charge-redistribution DAC and split summation

1995-06-05

1997-11-04

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341120, H03M 112

Patent

active

056844875

ABSTRACT:
An analog-to-digital (A/D) converter of the successive-approximation type wherein the digital-to-analog converter (DAC) includes a charge-redistribution, binary-weighted switched-capacitor array for producing the analog output for comparison with the analog input signal. A second switched-capacitor DAC is employed to develop error correction signals to be combined with the analog signal from the A/D conversion DAC. The conversion DAC array is connected to one input terminal of the comparator, and the error-correction DAC array is connected to the other comparator input terminal, an arrangement which reduces the number of capacitors required while providing symmetrical capacitance loading of the comparator input circuit.

REFERENCES:
patent: 4399426 (1983-08-01), Tan
patent: 4947169 (1990-08-01), Smith et al.

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