Tuning circuit for transconductors and related method

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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C327S552000, C327S554000

Reexamination Certificate

active

07468629

ABSTRACT:
Tuning circuits and related method for tuning transconductance in a transconductor-capacitor (Gm-C) filter system are provided. In the tuning circuit, a periodic input signal with constant amplitude triggers a transconductor cell to charge/discharge a capacitor for building an output signal across the capacitor, and a magnitude-detection feedback circuit provides feedback to tune a transconductance of the transconductor cell according to a magnitude of the output signal, such that the magnitude of the output signal can be locked within a predetermined magnitude range. When the magnitude of the output signal is locked, the ratio between transconductance and capacitance is also locked to a predetermined value because the magnitude of the output signal is determined by a ratio between transconductance and capacitance.

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