Programmable A-law and .mu.-law DAC

Details Programmable A-law and .mu.-law DAC Programmable A-law and .mu.-law DAC

1979-04-05

1982-01-19

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

307304, 328142, 340347M, 375 30, H03K 1302

Patent

active

043119883

ABSTRACT:
A companded stacked DAC is provided which can be used in an A-law or .mu.-law conversion merely by selection. The companded DAC is inherently monotonic and can be integrated with field effect transistors. The current sources of the DAC are switched to only one of two buses. The stacked DAC includes a chord DAC and a step DAC. The two buses which the chord DAC is connected to are maintained at approximately equal voltages by the use of a reference amplifier. The companded DAC uses successive approximation when converting.

REFERENCES:
patent: 3530386 (1970-09-01), Terry
patent: 3618073 (1971-11-01), Domchick et al.
patent: 3905028 (1975-09-01), Wintz et al.
patent: 3961326 (1976-06-01), Craven
patent: 4040049 (1977-08-01), Messerschmitt
patent: 4045793 (1977-08-01), Moench
patent: 4064506 (1977-12-01), Cartwright
patent: 4129863 (1978-12-01), Gray et al.
patent: 4231022 (1980-10-01), Kosugi et al.

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