Digital tuning circuit of GM-C filter

摘要

Provided is a tuning circuit of a G_m (transconductance)-C (capacitance) filter. The tuning circuit tunes a transconductance using direct current incorporating variations of a capacitance, instead of a clock signal, in a G_m tuning mode, while using the clock signal in a capacitance tuning mode. As such, it is possible to prevent deterioration of a received signal caused by the clock signal.