Oversampling DA converter with operational amplifier driven by a

Details Oversampling DA converter with operational amplifier driven by a Oversampling DA converter with operational amplifier driven by a

1992-01-21

1993-04-27

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341150, H03M 300

Patent

active

052066487

ABSTRACT:
In an oversampling digital-to-analog converter, an input 16-bit word digital signal is oversampled and quantized by a delta-sigma modulator into one of discrete values of +1, 0 and -1. A leaky integrator is coupled between the input and output terminals of an operational amplifier. A capacitor is charged by drawing a unit charge from a reference voltage source during a first half of the sample period of the +1 discrete value and discharged by injecting a unit charge to the input terminal of the operational amplifier during a second half of the sample period of the +1 discrete value. The capacitor is discharged during a first half of the sample period of the -1 discrete value and charged by drawing a unit charge from the input terminal of the operational amplifier during a second half of the sample period of the -1 discrete value. During the sample period of the 0 discrete value, the capacitor maintains a condition that occurs therein during the second half of the sample period of either of the +1 or -1 discrete value.

REFERENCES:
patent: 4622536 (1986-11-01), Shih et al.
patent: 4862121 (1989-08-01), Hochschild et al.
patent: 4988900 (1991-01-01), Fensch
patent: 5012245 (1991-04-01), Scott et al.
patent: 5072219 (1991-12-01), Boutaud et al.
patent: 5134402 (1992-07-01), Miyoshi
Naus, Peter J. A., et al., "A CMOS Stereo 16-bit D/A Converter for Digital Audio," IEEE Journal of Solid State Circuits, vol. SC-22, No. 3, Jun. 1987, pp. 380-395.

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