Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-05-08
1983-05-17
Miller, C. D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347C, H03K 1302
Patent
active
043842771
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: 4077035 (1978-02-01), Yee
patent: 4195282 (1980-03-01), Cameron
Haque, "IEEE Journal of Solid-State Circuits", vol. SC-14, No. 6, Dec. 1979, pp. 961-969.
Gray, "IEEE Journal of Solid-State Circuits", Dec. 1975, pp. 497-499.
Caves, "IEEE Journal of Solid-State Circuits", vol. SC-14, No. 1, Feb. 1979, pp. 65-73.
Allgood Robert N.
Kelley Stephen H.
King Robert L.
Miller C. D.
Motorola Inc.
Myers Jeffrey Van
Sarli, Jr. Anthony J.
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