Switched-capacitor filter circuit having at least one simulated

Details Switched-capacitor filter circuit having at least one simulated Switched-capacitor filter circuit having at least one simulated

1980-07-30

1982-12-14

Ruggiero, Joseph F.

Boots, shoes, and leggings

333214, 364802, G06G 762

Patent

active

043641164

ABSTRACT:
A switched-capacitor filter circuit having at least one simulated inductor and having an operational amplifier with a capacitor interconnected between its output and inverting input and a non-inverting input connected to a reference potential has a switch leading from the inverting input of the amplifier to a first circuit node from which a first capacitor is connected to the reference potential and also from which a second switch leads to a second circuit node from which another capacitor is connected to the reference potential, and has a third switch leading from the second circuit node to the inverting input of the amplifier and a fourth switch connected between the output of the amplifier and the second circuit node and a fifth switch connected to an input terminal. Each of the switches is controlled by one of a series of sequential non-overlapping clock pulse voltages with the first and fifth switches being simultaneously closed followed by sequential closing of the second, third and fourth switches.

REFERENCES:
patent: 3750037 (1973-07-01), Schmidt
patent: 3835399 (1974-09-01), Holmes
patent: 3886469 (1975-05-01), Rollett et al.
patent: 3936777 (1976-02-01), Rollett et al.
patent: 4168440 (1979-09-01), Gray
Moschytz-"Inductorless Filters:-A Survey"-IEEE Spectrum, Sep. 1970-pp. 63-75.
Temes et al.-"Switched-Capacitor Filter Design Using the Bilinear Z-Transform"-IEEE Transactions on Circuits and Systems-vol. CAS-25, No. 12, Dec. 1978, pp. 1039-1044.
Temes et al.-"Switched Capacitor Circuits Bilinearly Equivalent to Floating Inductor or F.D.N.R."-Electronics Letters, Feb. 1, 1979, vol. 15, No. 3-pp. 87 and 88

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