Integrated circuit filter with adjustable characteristics

Amplifiers – With semiconductor amplifying device – Including signal feedback means

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330109, 330307, H03F 134

Patent

active

045132542

ABSTRACT:
An adjustable filter arrangement is disclosed which is implemented in integrated circuit technologies. The filter configuration corresponds to a SALLEN-KEY filter in which the amplifier function is obtained by a transistor device, the R1 and R2 resistor functions are obtained by a first pair of suitably connected diodes, and the C1 and C2 functions are also integrated into the semiconductor chip. Adjustment of the natural frequency of the filter is obtained by the value of an externally supplied control current through the pair of diodes corresponding to R1 and R2. Adjustment of the damping characteristic of the filter is obtained by supplying a second control current to cause a relative change between the values of R1 and R2. No external components need be attached to the integrated circuit filter.

REFERENCES:
patent: 3805178 (1974-04-01), Rollett
patent: 3867712 (1975-02-01), Harthill
patent: 3889108 (1975-06-01), Cantrell
patent: 4201960 (1980-05-01), Skutta
patent: 4244008 (1981-01-01), Holt
"Monolithic Filters", Digest of Technical Papers, 1980, IEEE International Solid State Circuit Conference.

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