Digital to analog converter for generating distributive analog c

Details Digital to analog converter for generating distributive analog c Digital to analog converter for generating distributive analog c

1997-01-30

1998-07-21

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Multiplex

341144, 341145, 341152, H03M 100

Patent

active

057840199

ABSTRACT:
A digital-to-analog converter for converting a multiple bit digital input signal into multiple representative analog output signals includes a pulse density modulator, a logic controller, signal selection logic circuits and resistive-capacitive lowpass output filters. The pulse density modulator receives the N-M least significant bits of an N-bit digital input signal and in accordance therewith generates a pulse density modulated digital signal with a pulse density corresponding to a digital count of such N-M least significant bits. The logic controller receives the M most significant bits of the N-bit digital input signal and in accordance therewith generates multiple pairs of digital control signals. Each of the signal selection logic circuits receives the pulse density modulated digital signal and a respective pair of the digital control signals and in accordance therewith provides a respective one of a number of digital output signals. Together, each pair of digital control signals determines whether one of them or the pulse density modulated digital signal is provided as the respective digital output signal. The output filters lowpass filter the digital output signals to convert them to analog signals. The resulting analog signals represent a digital count of the original digital signal bits.

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patent: 5337338 (1994-08-01), Sutton et al.
patent: 5574455 (1996-11-01), Hori et al.

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