Digital-to-analog converter with delta-sigma modulation

Details Digital-to-analog converter with delta-sigma modulation Digital-to-analog converter with delta-sigma modulation

1991-10-11

1993-09-14

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341143, H03M 182

Patent

active

052453456

ABSTRACT:
The digital-to-analog conversion apparatus operates in synchronization with a system clock signal having a short period to oversample and delta-sigma-modulate a digital input to produce a requantized digital signal. The system clock signal is mixed with noise leaked back due to the oversampling and delta-sigma modulating operation. The system clock signal is frequency-divided by the rate of one-fourth or less to produce a divided clock signal having a long period and being free of the noise. The requantized digital signal is detected each long period, and is pulse-modulated according to the detected results to generate a pulse signal having the long period. This pulse signal is low-pass-filtered to produce an analog output having improved S/N ratio.

REFERENCES:
patent: 3754233 (1973-08-01), Sutherland
patent: 4233591 (1980-11-01), Murata et al.
patent: 4739304 (1988-04-01), Takeda et al.
patent: 5008675 (1991-04-01), Toyomaki
patent: 5021788 (1991-06-01), Ueki et al.
patent: 5043729 (1991-08-01), Fujimoto

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