Capacitive DAC to filter interface circuit

Details Capacitive DAC to filter interface circuit Capacitive DAC to filter interface circuit

1981-05-08

1983-05-17

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347C, H03K 1302

Patent

active

043842763

ABSTRACT:
An operational amplifier capable of selectively performing a variety of circuit functions is provided. A single operational amplifier utilizes switched capacitors for sampling and holding an input signal, for establishing a low frequency pole, for applying the sample to an output capacitance to charge the capacitance and for comparing the input signal with a reference. The multi-function circuit provides a large savings in circuit area and permits versatility of circuit applications. One embodiment of the invention is to utilize a companding DAC having a capacitor array which may be used as the output capacitance of the operational amplifier circuit. The DAC provided utilizes an R ladder DAC coupled directly to a C DAC and has a switching structure that is simpler than comparable prior art circuits. The DAC is asynchronous and has programmable A- and Mu-255 law PCM conversion capability. Coupled directly to the C DAC is an operational amplifier receive filter circuit which utilizes the C DAC as an input capacitor thereby eliminating the need for a buffer amplifier and allowing the DAC to be used for both analog to digital and digital to analog conversion.

REFERENCES:
patent: 4129863 (1978-12-01), Gray
patent: 4200863 (1980-04-01), Hodges
Haque "IEEE Journal of Solid State Circuits" vol. SC-14, No. 6, Dec. 1979, pp. 961-969.
Caves "IEEE Journal of Solid State Circuits" vol. SC-14, No. 1, Feb. 1979, pp. 65-73.

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