Tunable filter devices and methods
First Claim
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1. A device for performing analog filtering of a signal, comprising:
- a first unit comprising;
a first cell comprising;
a first splitter for splitting said signal into a first signal and a second signal;
a first channel connected to said first splitter for receiving said first signal;
a second channel having at least one of a first delay element, a first phase shifter and a first amplitude compensator, wherein said second channel is connected to said first splitter for receiving said second signal;
a first combiner for combining a signal output from said first channel with a signal output from said second channel to produce a first cell output signal;
a second cell coupled to said first cell for receiving said first cell output signal, said second cell comprising;
a second splitter for splitting said first cell output signal into a third signal and a fourth signal;
a third channel connected to said second splitter for receiving said third signal;
a fourth channel having at least one of a second delay element, a second phase shifter and a second amplitude compensator, wherein said third channel is connected to said second splitter for receiving said fourth signal;
a second combiner for combining a signal output from said third channel with a signal output from said fourth channel to produce a second cell output signal; and
a bypass for bypassing at least one of said first and second cells in accordance with a desired roll-off or stopband characteristic.
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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.
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Citations
8 Claims
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1. A device for performing analog filtering of a signal, comprising:
a first unit comprising; a first cell comprising; a first splitter for splitting said signal into a first signal and a second signal; a first channel connected to said first splitter for receiving said first signal; a second channel having at least one of a first delay element, a first phase shifter and a first amplitude compensator, wherein said second channel is connected to said first splitter for receiving said second signal; a first combiner for combining a signal output from said first channel with a signal output from said second channel to produce a first cell output signal; a second cell coupled to said first cell for receiving said first cell output signal, said second cell comprising; a second splitter for splitting said first cell output signal into a third signal and a fourth signal; a third channel connected to said second splitter for receiving said third signal; a fourth channel having at least one of a second delay element, a second phase shifter and a second amplitude compensator, wherein said third channel is connected to said second splitter for receiving said fourth signal; a second combiner for combining a signal output from said third channel with a signal output from said fourth channel to produce a second cell output signal; and a bypass for bypassing at least one of said first and second cells in accordance with a desired roll-off or stopband characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
Specification