Modulated tuned L/C transmitter circuits
OwnerGeorge Powellinventor
Life of this patent
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Abstract
A transmitter circuit for generating a modulated oscillating output signal, comprises a tuned inductor-capacitor resonant circuit, and further comprise switching means for changing the resonant circuit capacitance by switching a capacitance into and out of circuit, wherein the resulting change in resonant circuit output is used to provide modulation of the output with a data signal. The invention thus interrupts the resonant cycling of a resonant oscillator circuit to provide a modulation function, and this is achieved by switching the (or one of many) capacitors into and out of circuit.
Claims12
A transmitter circuit for generating a modulated oscillating output signal, comprising a tuned inductor-capacitor resonant circuit, and further comprising:
- switching means for changing the resonant circuit capacitance by switching a capacitance into and out of circuit, wherein the resulting change in resonant circuit output is used to provide modulation of the output with a data signal.
A method of providing amplitude modulation of a tuned inductor-capacitor resonant circuit, the method comprising:
- switching the capacitor of the tuned inductor-capacitor resonant circuit out of circuit substantially at a point in time when maximum charge is stored on the capacitor to provide a modulation of a first amplitude;
- and
- switching the capacitor of the tuned inductor-capacitor resonant circuit back in to circuit to provide a modulation of a second amplitude.
A method of providing frequency modulation of a tuned inductor-capacitor resonant circuit, the method comprising:
- switching a capacitor of the tuned inductor-capacitor resonant circuit out of circuit substantially at a point in time when maximum energy is stored in the inductor to provide a modulation of a first frequency;
- and
- switching the capacitor of the tuned inductor-capacitor resonant circuit back in to circuit at another point in the cycle time when maximum energy is again stored in the inductor to provide modulation of a second frequency.
Dependencies are inferred from the claim text.