Capacitive digital to analog converter which can be trimmed up a

Details Capacitive digital to analog converter which can be trimmed up a Capacitive digital to analog converter which can be trimmed up a

1983-06-27

1986-02-04

Shaw, Clifford C.

Communications: electrical

Audible indication

Percussion-type sound producer

340347DA, H03K 1302

Patent

active

045689172

ABSTRACT:
A capacitive digital to analog converter which can be trimmed to obtain precise capacitor matching is provided. The trimming method may be utilized with a weighted capacitive D/A converter having a scaling capacitor and an ordered plurality of capacitors for developing an analog output signal as a function of a digital input code. A compensation portion is coupled to at least a predetermined one of the capacitors for selectively changing the effective capacitive value of the predetermined capacitor.

REFERENCES:
patent: 4028694 (1977-06-01), Cook et al.
patent: 4338590 (1982-07-01), Connolly, Jr. et al.
patent: 4399426 (1983-08-01), Tan
patent: 4476456 (1984-10-01), Domogalla

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