Patent ID: 6185264
Filing Date: 2001-02-06
Classification: H04L

Abstract:
A frequency shift keying generator comprising:(a) a resonant circuit;(b) a reactive element;(c) a switch for coupling and decoupling said reactive element to and from said resonant circuit, said resonant circuit oscillating at a first frequency when said reactive element is coupled and said resonant circuit oscillating at a second frequency when said reactive element is uncoupled;(d) a power supply having an output port coupled to said resonant circuit, said power supply including means responsive to a control signal for enabling said output port for energizing said resonant circuit;(e) a detector coupled to said resonant circuit for detecting an energy level for said reactive element and producing an output signal indicative of said energy level; and(f) a controller for controlling said switch, said controller including an output port for actuating said switch and an input port coupled to said detector for receiving said energy level output signal, said controller also having a data input for receiving a data signal and means for selectively actuating said switch to shift the oscillation of said resonant circuit between said first and second frequencies in response to a change of state in the data signal, and said controller including means responsive to said energy level for synchronizing the actuation of said switch with the energy level in said reactive element.