Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1980-05-29
1982-05-11
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307577, 307583, 307497, 330107, 330109, H03H 1100, H03F 134
Patent
active
043295991
ABSTRACT:
A switched-capacitor cosine filter for a sampled-data system functions to reject extraneous frequency components of an incoming analog signal around the sampling frequency, thereby avoiding aliasing. The filter comprises an operational amplifier whose inverting input receives input signals through a switched input capacitor controlled by a four-switch network controlled by alternating clock phases and feedback signals from the amplifier output through a feedback capacitor. The transfer function of the circuit provides a zero of transmission at the sampling frequency, thereby eliminating unwanted frequency components. A self-contained version of the cosine filter is provided by the addition of another grounded switched capacitor with appropriately timed switches in the feedback network.
REFERENCES:
patent: 3497716 (1970-02-01), Schmid et al.
patent: 4179665 (1979-12-01), Gregorian
IEEE Journal of Solid State Circuits, vol. SC12, No. 6, Dec. 1977, pp. 592-599, "Sampled Analog Filtering Using Switched Capacitor as Resistor Equivalents", by Caves et al.
IEEE Journal of Solid State Circuits, vol. SC12, No. 6, Dec. 1977, pp. 600-608, "MOS Sampled Data Recursive Filters Using Switched Capacitor Integrators", by Hosticka et al.
Gregorian Roubik
Suzuki Toshiro
American Microsystems, Inc.
Caserza Steven F.
Franklin Richard
Heyman John S.
MacPherson Alan H.
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