Interpolating digital to analog converter architecture for impro

Details Interpolating digital to analog converter architecture for impro Interpolating digital to analog converter architecture for impro

1996-02-14

1998-08-25

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341159, 341172, H03M 166

Patent

active

057987246

ABSTRACT:
A digital-to-analog conversion method and interpolating digital-to-analog converter for a data modulation system which reduces the spurious energy content of the output signal by an order of magnitude to thereby permit use of a less complex reconstruction filter to smooth the analog output. The process is a two step charge redistribution with feedback to interpolate between samples. DC offset is minimized by using double sampling techniques which permit a fully held signal between interpolation samples. A first conversion stage converts the first n bits of an N bit data signal received at an input rate to a first output value, and a second conversion stage converts the remainder of the N bits and combines signals from the two conversion stages to provide a combined output to an interpolation stage which provides an interpolated output at an interpolation output rate. A feedback circuit provides the interpolated output to an input of the second conversion stage.

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patent: 5245344 (1993-09-01), Sooch
patent: 5327092 (1994-07-01), Inogai et al.
High Resolution Suiched Capacitor D/A Converter, Microelectronics Journal vol. 12 No. 2 1981, pp. 10-13.

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