Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-09-26
1992-06-23
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328167, 307491, H03B 100, H03K 500
Patent
active
051245930
ABSTRACT:
A tuning circuit for tuning an integrated circuit filter, such as a continuous-time MOSFET-C filter, is disclosed. The tuning circuit includes a switched-capacitor network having a capacitor which matches the capacitor used in the filter to be tuned. Also included is a transistor which matches the transistor used in the filter. The switched-capacitor network has a effective resistance which is a function of the switching rate of the network. Feedback circuitry is included which produces a control signal used to vary the small signal resistance of the transistor to match the effective resistance of the switched-capacitor network. The filter is tuned by varying the rate of which the switched capacitor network is clocked thereby changing to effective network resistance. The control voltage responds by forcing the transistor resistance to match the new effective resistance of the switched-capacitor network. The control voltage is used to tune the filter and changes to compensate for variations in the filter capacitor and transistor, which track variations in the filter transistor and capacitor.
REFERENCES:
patent: 4045731 (1977-08-01), Tokunou et al.
patent: 4066976 (1978-01-01), Dickopp et al.
patent: 4691171 (1987-09-01), Van Roermund et al.
patent: 4733205 (1988-03-01), Hughes
Callahan Timothy P.
National Semiconductor Corporation
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