A Multi-Function Modulator for Low-Powered, Wired and Wireless Command, Control, and Communications Applications
Patent application, filed 24 Nov 2008
DEPARTMENT OF THE NAVY WASHINGTON DC
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An amplitude, phase and frequency modulator circuit is provided with the circuit containing a periodically driven switch. The circuit connects a DC power source and a resistive load. Periodic operation of the switch generates a square-wave of voltage across the load. A transistor used as a switch is embedded in a switch driver that controls base current and base-emitter reverse bias voltage. The modulator DC input resistance is approximately equal to the load resistance when the switch ON-state period and OFF-state period are approximately equal. The modulator efficiency is nearly one hundred percent. The frequency response of the square-wave modulator system is high-pass with a lower cutoff frequency determined by element values.
- Electrical and Electronic Equipment
- Electric Power Production and Distribution