Frequency divider with variable capacitance.

摘要

A frequency divider (10) includes an inductor (L) connected in parallel with a variable capacitance (C) to to define a resonant circuit for detecting electromagnetic radiation (34) at a first predetermined frequency and for responding to said detection by transmitting electromagnetic radiation (38) at a second frequency that is one-half the first frequency, with the circuit being resonant at the second frequency when there is zero voltage across the capacitance. The variable capacitance includes a lamination of an insulation material (12) and a semiconductor material (14) disposed between metal terminals (16, 18), such that as a voltage applied across the terminals (16, 18) varies, a concentration of charge carriers in a region (24) of the semiconductor material adjacent the insulation material (12) varies to thereby vary the value of said capacitance. <IMAGE>