Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Temperature
Patent
1993-05-24
1996-05-21
Sikes, William L.
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Temperature
327101, 327105, H03F 130
Patent
active
055192653
ABSTRACT:
An integrated circuit includes an analog-signal manipulating circuit (ASMC) such as a filter having a transfer function with a frequency response that is determined by at least one RC product. The integrated circuit also includes separately an RC oscillator. The frequency-response-determining RC products of an RC component pair in the filter and an oscillator frequency determining RC component pair in the RC oscillator are digitally programmable by an external microprocessor. The microprocessor holds the frequency of the RC oscillator fixed relative to its own crystal controlled oscillator by adjusting the programmable RC component pair of the RC oscillator. The same adjusting digital signal from the microprocessor is simultaneously applied to the programmable RC component pair(s) of the ASMC, which has the effect of stabilizing all RC component pairs and thus the ASMC frequency response. The capacitors of each RC component pair have binary-control-signal lines mutually parallel connected to each other. The microprocessor senses the frequency of the oscillator and by sending the appropriate binary control signal to the paralleled control lines to adjust the frequency of the RC oscillator to a predetermined value, the RC products of the other component pairs in the filter are adjusted to their respective predetermined values and maintained there during operation of the integrated filter circuit while subject to changes in temperature that would otherwise alter the RC products and therefore the transfer function of the ASMC.
REFERENCES:
patent: 4446438 (1984-05-01), Chang et al.
patent: 5245262 (1993-09-01), Moody et al.
patent: 5258760 (1993-11-01), Moody et al.
patent: 5278478 (1994-01-01), Moody et al.
Dudek James
Sikes William L.
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