Temperature insensitive filter tuning network and method

Details Temperature insensitive filter tuning network and method Temperature insensitive filter tuning network and method

1995-06-30

1996-11-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327552, 327553, 327362, 327378, 327535, 327530, 323312, 323315, 323316, 330309, H03K 17687, G05F 326

Patent

active

055721613

ABSTRACT:
A method and circuit for tuning an equivalent resistor in a filter so that the filter is insensitive to temperature changes in which an amplifier output is connected to a common gate of plural MOSFETs for providing equivalent resistances, and in which one input to the amplifier is connected to a reference resistor and the other input to the amplifier is connected to an equivalent resistor that includes one of the plural MOSFETs. An input current to the reference resistor and to the equivalent resistor's MOSFET is inversely proportional to the MOSFET's conduction parameter, k (i.e., .mu.C.sub.ox /2), so that both the inputs to the amplifier vary to change the amplifier output voltage to the common gate. The amplifier output changes render the filter insensitive to temperature changes.

REFERENCES:
patent: 4495425 (1985-01-01), McKenzie
patent: 5038053 (1991-08-01), Djenguerian et al.
patent: 5081380 (1992-01-01), Chen
patent: 5107199 (1992-04-01), Vo et al.
patent: 5124593 (1992-06-01), Michel
patent: 5402064 (1995-03-01), Eck et al.

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