Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1981-05-08
1983-01-25
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
307241, 307246, 307353, 307523, H03H 1112, H03F 134
Patent
active
043706320
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: 4151429 (1979-04-01), Hupe
patent: 4315227 (1982-02-01), Fleischer et al.
patent: 4331894 (1982-05-01), Gregorian et al.
Allgood Robert N.
Kelley Stephen H.
Ulmer Richard W.
Wurzburg Henry
King Robert Lee
Motorola Inc.
Myers Jeffrey Van
Nussbaum Marvin L.
Sarli, Jr. Anthony J.
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