Tuning circuit for continuous-time filters and method therefor

Details Tuning circuit for continuous-time filters and method therefor Tuning circuit for continuous-time filters and method therefor

1991-10-28

1993-02-16

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328151, 307521, 330109, 333173, H03B 100, H03B 104, H03K 500

Patent

active

051874458

ABSTRACT:
A tuning circuit (30) provides selection signals to a passive component array (80) in a continuous-time filter (70) to compensate for wide variations in values which are encountered in integrated circuit processing. The tuning circuit (30) includes at least one capacitor (46) and at least one resistor (31), and a plurality of either capacitors or resistors. A largest component is enabled and an integration of a reference current during a predetermined period is performed. If the integration provides a voltage greater than a reference voltage, then a corresponding selection signal is set and the component is selected. Successive integrations are performed to determine which components are enabled by corresponding selection signals in order to enable a combination of components which most closely integrates the reference current to the reference voltage. When selection signals corresponding to all components have been determined, the selection signals are applied to corresponding components in the filter (70).

REFERENCES:
patent: 4443757 (1984-04-01), Bui
patent: 4791379 (1988-12-01), Hughes
patent: 4866400 (1989-09-01), Britton, Jr. et al.
Gerger et al., "Switched-Resistor Filters-A Continuous Time Approach to Monolithic MOS Filter Design", IEEE Trans. on Circuits & Systems, vol. CAS-29, No. 5, May 1982, pp. 306-315.
Gregorian, R. and Temes, G., Analog MOS Integrated Circuits for Signal Processing, John Wiley & Sons, New York, 1986, pp. 400-401.

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