Tuning circuit for an RC filter
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United States of America Patent
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Apr 29, 1997
Grant Date -
N/A
app pub date -
Jul 1, 1994
filing date -
Jul 1, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A tuning circuit (202) uses a precision current reference (Iref) along with an analog-to-digital converter (218) to produce a digital output (228) to represent variations of internal resistance values. The precision current reference (Iref) is fed to an internal tuning resistor (R210) in order to provide an analog voltage signal to the analog-to-digital converter (218). The analog voltage signal changes in accordance with the variations in the tuning resistor value over process and temperature. The digital output (228) controls programmable capacitor arrays (C220, C222) which are included in the tuning circuit (202) as well as in an active RC filter (208) whose bandwidth is controlled by the programmable capacitor arrays (C220, C222) and internal resistors (R212, R214, R216).
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