Capacitor array having user-adjustable, manufacturer-trimmable capacitance and method
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United States of America Patent
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May 18, 1999
Grant Date -
N/A
app pub date -
Apr 8, 1997
filing date -
Apr 8, 1997
priority date (Note) -
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Abstract
A programmable integrated circuit capacitor array includes a plurality of binarily weighted capacitors (16) and a plurality of switches (18) selectively coupling the capacitors in parallel between first and second terminals. A control circuit (10) responds to a plurality of capacitance selection inputs (CS0,1,2) in conjunction with a plurality of trim inputs (TR0,1) and a sign input (TRS) to produce a plurality of selection signals (SEL0,1 . . . 7) on control electrodes of the switches to couple one or more of the capacitors and thereby provide an accurate value of the desired capacitance between the first and second terminals despite any manufacturing deviations in capacitance per unit area.
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