DUAL-INPUT, HIGH POWER HANDLING, POWER COMBINING LNA FOR FULL DUPLEX COMMUNICATIONS SYSTEMS
First Claim
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1. An apparatus comprising:
- a first gain stage configured to amplify a receive signal acquired from a circuit to generate an intermediate signal;
a combiner configured to combine said intermediate signal with a cancellation signal to generate a combined signal, wherein said cancellation signal is derived from a transmit signal a portion of which appears in said receive signal through said circuit; and
a second gain stage configured to amplify said combined signal to generate an output signal.
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Abstract
An apparatus includes a first gain stage, a combiner and a second gain stage. The first gain stage may be configured to amplify a receive signal acquired from a circuit to generate an intermediate signal. The combiner may be configured to combine the intermediate signal with a cancellation signal to generate a combined signal. The cancellation signal is generally derived from a transmit signal a portion of which appears in the receive signal through the circuit. The second gain stage may be configured to amplify the combined signal to generate an output signal.
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Citations
20 Claims
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1. An apparatus comprising:
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a first gain stage configured to amplify a receive signal acquired from a circuit to generate an intermediate signal; a combiner configured to combine said intermediate signal with a cancellation signal to generate a combined signal, wherein said cancellation signal is derived from a transmit signal a portion of which appears in said receive signal through said circuit; and a second gain stage configured to amplify said combined signal to generate an output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for dual-input low noise amplification, comprising the steps of:
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amplifying a receive signal acquired from a circuit in a first gain stage to generate an intermediate signal; combining said intermediate signal with a cancellation signal derived from a transmit signal to generate a combined signal, wherein a portion of said transmit signal appears in said receive signal through said circuit; and amplifying said combined signal in a second gain stage to generate an output signal. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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a circulator configured to (i) transfer an antenna signal to a receive signal and (ii) transfer a transmit signal to said antenna signal, wherein a portion of said transmit signal appears in said receive signal; an attenuator configured to attenuate and phase shift a cancellation signal derived from said transmit signal; and a low-noise amplifier (i) comprising a plurality of gain stages and two input nodes that acquire said receive signal and said cancellation signal respectively and (ii) configured to combine said receive signal with said cancellation signal after a first gain stage of said plurality of gain stages to generate a combined signal.
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Specification