High Q switched capacitor filter having internal thin-film resis

Details High Q switched capacitor filter having internal thin-film resis High Q switched capacitor filter having internal thin-film resis

1989-06-06

1991-01-29

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330107, 330307, H03F 134

Patent

active

049889524

ABSTRACT:
Disclosed is a switched capacitor filter block having a nonlinear quality coefficient, Q, whereby quality can be enhanced while limiting the size of feedback resistors in the filter block. A pair of capacitors alternately switchably connect an input signal to the input of integrator whereby the sampling frequency is twice the switching frequency. The filter block is readily fabricated in a monolithic integrated circuit with the feedback resistors being thin-film resistors formed on the surface of the monolithic integrated circuit. Such a circuit configuration is more accurate in programming and requires only one mask step in fabrication to program.

REFERENCES:
patent: 3535646 (1970-10-01), Quinn
patent: 4195266 (1980-03-01), Bingham
patent: 4375625 (1983-03-01), Lee
patent: 4417214 (1983-11-01), Sevastopoulos et al.
patent: 4769612 (1988-09-01), Tamakoshi et al.
Linear Technology Specification for LTC 1060 Dual Filter (1986).
Linear Technology Specification for LTC 1064 Quad Universal Filter (1989).

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