Circuit arrangement for capacitance amplification

Details Circuit arrangement for capacitance amplification Circuit arrangement for capacitance amplification

1995-07-11

1997-07-22

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

327103, 327560, 327563, 327530, H03G 302

Patent

active

056507461

ABSTRACT:
A simple circuit arrangement for amplifying the effect of a capacitance. The input of the circuit arrangement is connected to an output of a current mirror circuit and, via the capacitance, to an input of the current mirror circuit to which a constant current (I) of known magnitude is applied. The degree of amplification of the effect of the capacitance is dependent on the area ratio n between the input transistor and the output transistor of the current mirror circuit. A constant current (n.multidot.I) is applied to the output of the current mirror circuit and is equal to the current applied to the input of the current mirror circuit multiplied by the area ratio n.

REFERENCES:
patent: 4025867 (1977-05-01), Seidel
patent: 5166560 (1992-11-01), Liu
"Design and Implementation of a CMOS VCXO for FM Stereo Decoders", by H. Qiuting et al, IEEE Journal of Solid-State Circuits, vol. 23, No. 3, Jun. 1988, pp. 784-793.

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