Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1990-02-13
1991-06-04
Scott, J. R.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341144, H03M 182
Patent
active
050217887
ABSTRACT:
A PWM digital-to-analog converter is disclosed in which a value representing a differential between a first pulse width modulated waveform based upon input digital data and a second pulse width modulated waveform representing a 2's complement version of the input digital data is produced by a differential amplifier and high frequency components thereof are attenuated to produce an analog output signal and with an improved distortion factor.
REFERENCES:
patent: 3912863 (1975-10-01), Patience
patent: 4467319 (1984-08-01), Uchikoshi
patent: 4542371 (1985-09-01), Uchikoshi
patent: 4780656 (1988-10-01), Mitchell
patent: 4929947 (1990-05-01), Toyama
The Engineering Staff of Analog Devices, Inc. Analog-Digital Conversion Handbook, 1986, pp. 186-188.
Kanai Takashi
Masuda Toshihiko
Ueki Massaaki
Frommer William S.
Scott J. R.
Sinderbrand Alvin
Sony Corporation
Williams H. L.
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