Dual-input, high power handling, power combining LNA for full duplex communications systems
First Claim
Patent Images
1. An apparatus comprising:
- a first input node that acquires a receive signal;
a second input node that acquires a cancellation signal and is separate from said first input node;
a first gain circuit configured to amplify said receive signal acquired through said first input node to generate an intermediate signal;
a combiner circuit configured to combine said intermediate signal with said cancellation signal acquired through said second input node to generate a combined signal, wherein (i) said cancellation signal is an attenuated version of a transmit signal and (ii) a portion of said transmit signal appears in said receive signal acquired through said first input node; and
a second gain circuit configured to amplify said combined signal to generate an output signal, wherein said first input node, said second input node, said first gain circuit, said combiner circuit and said second gain circuit form a low-noise amplifier.
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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.
17 Citations
20 Claims
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1. An apparatus comprising:
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a first input node that acquires a receive signal; a second input node that acquires a cancellation signal and is separate from said first input node; a first gain circuit configured to amplify said receive signal acquired through said first input node to generate an intermediate signal; a combiner circuit configured to combine said intermediate signal with said cancellation signal acquired through said second input node to generate a combined signal, wherein (i) said cancellation signal is an attenuated version of a transmit signal and (ii) a portion of said transmit signal appears in said receive signal acquired through said first input node; and a second gain circuit configured to amplify said combined signal to generate an output signal, wherein said first input node, said second input node, said first gain circuit, said combiner circuit and said second gain circuit form a low-noise amplifier. - 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 in a first gain circuit to generate an intermediate signal, wherein said receive signal is acquired through a first input node; combining said intermediate signal with a cancellation signal in a combiner circuit to generate a combined signal, wherein (i) said cancellation signal is acquired through a second input node that is separate from said first input node, (ii) said cancellation signal is an attenuated version of a transmit signal, and (iii) a portion of said transmit signal appears in said receive signal acquired through said first input node; and amplifying said combined signal in a second gain circuit to generate an output signal, wherein said first input node, said second input node, said first gain circuit, said combiner circuit and said second gain circuit form a low-noise amplifier. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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a circulator circuit 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 circuit 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 circuits, a first input node that acquires said receive signal and a second input node that acquires said cancellation signal and is separate from said first input node and (ii) configured to (a) combine said receive signal with said cancellation signal after a first gain circuit of said plurality of gain circuits to generate a combined signal and (b) amplify said combined signal in a second gain circuit of the plurality of gain circuits to generate an output signal.
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Specification