H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/97
H03M 1/66 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1182924
A CAPACITIVE DAC TO FILTER INTERFACE CIRCUIT ABSTRACT An operational amplifier capable of selectively per- forming 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 cir- cuit 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 capaci- tor 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 pro- grammable A- and Mu-225 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.
401210
Kelley Stephen H.
Ulmer Richard W.
Gowling Lafleur Henderson Llp
Motorola Inc.
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