Controlling the current through a Diode Bridge VCF
As a matter of fact current does not flow through the semiconductor diode but a mirror current exchanged at the depletion (P-N) region. The currrent in the depletion region changes the width thereof and hence its capacitance. Similar phenomenon means depletion region capacitance variation is also observed when the junction s reverse biased. Thus the junction capacitance is contrlled by the biasing voltage or current so the knee point of the filter.
V T Ingole