Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor
First Claim
1. An apparatus for down-conversion, comprising:
- a capacitor having a first and second port, the first port of the capacitor electrically coupled to a RF information signal; and
a switching device having a first, second and third port, whereinthe first port of the switching device is connected to the second port of the capacitor,the second port of the switching device is coupled to a control signal, andthe third port of the switching device is coupled to a bias signal.
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Abstract
Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In embodiments, up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used in the frequency modulation or phase modulation implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate a bias signal. The output of the switch is filtered, and the desired harmonic is output.
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8 Claims
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1. An apparatus for down-conversion, comprising:
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a capacitor having a first and second port, the first port of the capacitor electrically coupled to a RF information signal; and a switching device having a first, second and third port, wherein the first port of the switching device is connected to the second port of the capacitor, the second port of the switching device is coupled to a control signal, and the third port of the switching device is coupled to a bias signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification