TUNABLE FILTER DEVICES AND METHODS
First Claim
Patent Images
1. A method for analog filtering of a signal comprising the steps of;
- a) providing an input signal to at least one cell;
b) providing a first input signal to at least a first channel and a second channel in said at least one cell;
c) modifying said first input signal in said first channel with respect to at least one of delay, amplitude, and phase, to provide a first channel signal;
d) modifying input signal in second channel with respect to at least one of;
delay, amplitude and phase, to provide a second channel signal; and
e) combining said first channel signal and said second channel signal by at least one of constructive, destructive and null interference to provide an output comprising a desirable signal.
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Abstract
Analog interference filter devices and methods for isolation of desirable portions of a radio frequency signal. Signal compensation is used to provide desirable center frequency, passband width, ripple, rolloff, stopband and distortion performance. The filter is implemented with passive and/or active components.
13 Citations
19 Claims
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1. A method for analog filtering of a signal comprising the steps of;
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a) providing an input signal to at least one cell; b) providing a first input signal to at least a first channel and a second channel in said at least one cell; c) modifying said first input signal in said first channel with respect to at least one of delay, amplitude, and phase, to provide a first channel signal; d) modifying input signal in second channel with respect to at least one of;
delay, amplitude and phase, to provide a second channel signal; ande) combining said first channel signal and said second channel signal by at least one of constructive, destructive and null interference to provide an output comprising a desirable signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for analog filtering of a signal comprising the steps of;
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providing an input signal to a first unit, said first unit comprising a first cell, a second cell and a first unit output; providing said input signal to said first cell; providing said first input signal to a first channel and a second channel in said at least one cell; modifying said first input signal in said first channel with respect to at least one of delay, amplitude, and phase, to provide a first channel signal; modifying input signal in second channel with respect to at least one of;
delay, amplitude and phase, to provide a second channel signal;combining said first channel signal and said second channel signal by at least one of constructive, destructive and null interference to provide a first output signal; providing said first output signal to said second cell; providing said first output signal to a first channel and a second channel in said second cell; h) modifying said first output signal provided to said first channel of said second cell with respect to at least one of delay, amplitude, and phase, to provide a second cell first channel signal; i) modifying said first output signal provided to said second channel of said second cell with respect to at least one of delay, amplitude and phase, to provide a second cell second channel signal; and j) combining said second cell first channel signal and said second cell second channel signal by at least one of constructive, destructive and null interference to provide a second output signal. - View Dependent Claims (10, 11)
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12. A device for performing analog filtering of a signal, comprising:
a unit comprising; a cell comprising; a splitter for splitting said signal into a first signal and a second signal; a first channel connected to said first signal; a second channel having a second input and at least one of a second delay element, a second phase shifter and a second amplitude compensator, wherein said second channel is connected to said second signal; and a combiner for combining a signal output from said first channel with a signal output from said second channel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
Specification