Dynamically tuned amplifier for frequency shift keyed signals
First Claim
1. A circuit, comprising:
- a tunable resonant load containing a variable load energy having a load phase;
a driver coupled across said tunable resonant load to apply a variable drive signal having a drive frequency and phase to said tunable resonant load to supply said variable load energy;
a controller coupled to said tunable resonant load and coupled to said driver, said controller including a first component for controlling said drive phase of said drive signal, a second component for tuning said tunable resonant load, and a third component for setting said variable load energy; and
a feedback loop coupled between said tunable resonant load and said controller, said feedback loop generating an error signal in response to a phase deviation between said drive phase and said load phase;
wherein, in response to said error signal, said second component generates a tuning signal for tuning said tunable resonant load.
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Accused Products
Abstract
An amplifier circuit for efficiently driving a tuned resonant load where the amplifier circuit controls the continuously variable resonant frequency of the tuned resonant load so as to match step changes or slower changes in the frequency of the signal with which it is being driven. The circuit includes a tuned resonant load, a driver, a controller and a feedback loop. The driver is coupled to the load and drives it with a driving signal at a frequency under the control of the controller. The controller dynamically controls the resonant frequency of the tuned resonant load in response to an error signal received through the feedback loop. The error signal represents the mismatch in phase between the resonant phase of the load current and the phase of the driving signal, or between the resonant phase of the tuning capacitor voltage offset by 90 degrees and the phase of the driving signal. The controller also controls the pulse width of the driving signal, which controls the energy transferred to the load, and ensures the pulses are centered within the half-cycle of the load current to avoid advancing or retarding the phase of the load current in each half cycle.
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Citations
34 Claims
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1. A circuit, comprising:
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a tunable resonant load containing a variable load energy having a load phase;
a driver coupled across said tunable resonant load to apply a variable drive signal having a drive frequency and phase to said tunable resonant load to supply said variable load energy;
a controller coupled to said tunable resonant load and coupled to said driver, said controller including a first component for controlling said drive phase of said drive signal, a second component for tuning said tunable resonant load, and a third component for setting said variable load energy; and
a feedback loop coupled between said tunable resonant load and said controller, said feedback loop generating an error signal in response to a phase deviation between said drive phase and said load phase;
wherein, in response to said error signal, said second component generates a tuning signal for tuning said tunable resonant load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of driving a tunable resonant load with an amplifier using a drive signal having a driving phase, the tunable resonant load containing a load energy having a load phase, the method including the steps of:
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(a) applying the drive signal to said tunable resonant load;
(b) measuring a phase difference between said drive phase of said drive signal and said load phase of said load energy;
(c) generating an error signal based upon said phase difference; and
(d) tuning said tunable resonant load in response to said error signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An apparatus, comprising:
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a resonant load having a resonant frequency and including tuning means for continuous tuning of said resonant frequency, said resonant load containing a load energy having a load phase;
drive means for driving said tunable resonant load with a drive signal having a drive phase;
control means coupled to said tunable resonant load and coupled to said drive means, for controlling said drive phase of said drive signal and for controlling said tuning means; and
feedback means coupled between said tunable resonant load and said control means, said feedback means generating an error signal in response to a phase deviation between said drive phase and said load phase;
wherein said control means controls said tuning means in response to said error signal. - View Dependent Claims (31, 32, 33, 34)
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Specification