PHASE AND AMPLITUDE DETECTION IN WIRELESS ENERGY TRANSFER SYSTEMS
First Claim
1. An electronic device comprising:
- a first finite input response (FIR) filter that receives an input signal and a first reference signal, wherein the first FIR filter filters the first reference signal to generate a first sinusoidal signal and mixes the first sinusoidal signal and the input signal to generate a first mixed signal;
a second FIR filter that receives the input signal and a second reference signal, wherein the second FIR filter filters the second reference signal to generate a second sinusoidal signal and mixes the second sinusoidal signal and the input signal to generate a second mixed signal; and
a controller coupled with the first FIR filter and the second FIR filter, the controller configured to determine a characteristic of the input signal based on the first mixed signal and the second mixed signal.
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Accused Products
Abstract
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for detecting characteristics of an input signal. One aspect includes a first finite input response (FIR) filter, a second FIR filter, and a controller coupled with the first and second FIR filters. The first FIR filter receives an input signal and a first reference signal. The first FIR filter filters the first reference signal to generate a first sinusoidal signal and mixes the first sinusoidal signal and the input signal to generate a first mixed signal. The second FIR filter receives the input signal and a second reference signal. The second FIR filter filters the second reference signal to generate a second sinusoidal signal and mixes the second sinusoidal signal and the input signal to generate a second mixed signal. The controller determines characteristics of the input signal based on the first and second mixed signals.
4 Citations
24 Claims
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1. An electronic device comprising:
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a first finite input response (FIR) filter that receives an input signal and a first reference signal, wherein the first FIR filter filters the first reference signal to generate a first sinusoidal signal and mixes the first sinusoidal signal and the input signal to generate a first mixed signal; a second FIR filter that receives the input signal and a second reference signal, wherein the second FIR filter filters the second reference signal to generate a second sinusoidal signal and mixes the second sinusoidal signal and the input signal to generate a second mixed signal; and a controller coupled with the first FIR filter and the second FIR filter, the controller configured to determine a characteristic of the input signal based on the first mixed signal and the second mixed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A finite impulse response (FIR) filter comprising:
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a plurality of filter taps, each filter tap comprising; a delay circuit comprising an input terminal to receive a square wave and an output terminal to output a delayed version of the square wave; a switch comprising an input terminal, an output terminal, and a control terminal, the control terminal being electrically connected to the output terminal of the delay circuit to receive the delayed version of the square wave at the control terminal, and the input terminal of the switch being electrically connected to a common input signal line for the plurality of filter taps; and a resistor electrically connected to one of the input terminal or the output terminal of the switch; an operational amplifier, wherein an output terminal of each of the plurality of filter taps is electrically connected to an input terminal of the operational amplifier; and a feedback path electrically connecting an output terminal of the operational amplifier to the input terminal of the operational amplifier. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification