Radio frequency transmitter having switched mode power supply
DCFirst Claim
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1. A hand-held radio frequency transmitter for use in generating a coded radio frequency transmission comprising:
- a switched mode power supply energizable by a battery for delivering a pre-selected, uniform potential greater than the potential of the battery to an oscillator;
an oscillator coupled to be driven by the switched mode power supply; and
a modulator for controlling operation of the oscillator to cause the oscillator to be modulated by coded signals and for controlling operation of the switched mode power supply for enabling and disabling current flowing therethrough;
wherein said switched mode power supply is coupled in a feedback loop with said modulator wherein the feedback loop signals said modulator when the switched mode power supply reaches the pre-selected, uniform potential effective for minimizing transmitter frequency drift.
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Abstract
A hand-held radio frequency transmitter for use in generating a coded radio frequency transmission has a switched mode power supply energizable by a battery. A radio frequency oscillator is driven by the switched mode supply. A modulator controls operation of the oscillator which produces a coded radio frequency signal.
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Citations
8 Claims
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1. A hand-held radio frequency transmitter for use in generating a coded radio frequency transmission comprising:
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a switched mode power supply energizable by a battery for delivering a pre-selected, uniform potential greater than the potential of the battery to an oscillator; an oscillator coupled to be driven by the switched mode power supply; and a modulator for controlling operation of the oscillator to cause the oscillator to be modulated by coded signals and for controlling operation of the switched mode power supply for enabling and disabling current flowing therethrough; wherein said switched mode power supply is coupled in a feedback loop with said modulator wherein the feedback loop signals said modulator when the switched mode power supply reaches the pre-selected, uniform potential effective for minimizing transmitter frequency drift. - View Dependent Claims (2, 3)
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4. A hand-held radio frequency transmitter, comprising:
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a switched mode power supply, energizable by a battery, for delivering a pre-selected, uniform voltage treater than the potential of the battery to an oscillator, said power supply including a storage capacitor; a controller comprising at least one input port and at least one output port coupled in a feedback loop with said switched mode power supply, for controlling said switched mode power supply via said at least one output port, the feedback loop signaling said controller at said at least one input port when the storage capacitor reaches said preselected, uniform voltage, effective for minimizing transmitter frequency drift; and an oscillator powered by said switched mode power supply for use in generating a coded radio frequency transmission responsive to said controller; said controller being further responsive to an event for controlling said oscillator for generating the coded radio frequency transmission. - View Dependent Claims (5, 6, 7, 8)
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Specification