DUAL-INPUT, HIGH POWER HANDLING, POWER COMBINING LNA FOR FULL DUPLEX COMMUNICATIONS SYSTEMS

• US 20170104573A1
• Filed: 04/29/2016
• Published: 04/13/2017
• Est. Priority Date: 10/08/2015
• Status: Active Grant

• Current Assignee: MACOM Technology Solutions Holdings, Inc.
• Original Assignee: MACOM Technology Solutions Holdings, Inc.
• Inventors: Ryan, David
• Granted Patent: US 10,003,451 B2
• Time in Patent Office: Days
• CPC Class Codes: H03F 1/565 using inductive elements
• CPC Class Codes: H03F 2200/294 the amplifier being a low noise amplifier [LNA]
• CPC Class Codes: H03F 2200/387 A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier
• CPC Class Codes: H03F 2200/411 the output amplifying stage of an amplifier comprising two power stages
• CPC Class Codes: H03F 2200/451 the amplifier being a radio frequency amplifier
• CPC Class Codes: H03F 2203/45394 the AAC of the dif amp comprising FETs whose sources are not coupled, i.e. the AAC being a pseudo-differential amplifier
• CPC Class Codes: H03F 3/193 with field-effect devices H03F3/195 takes precedence
• CPC Class Codes: H03F 3/195 in integrated circuits
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H03F 3/245 with semiconductor devices only
• CPC Class Codes: H03F 3/45179 using MOSFET transistors as the active amplifying circuit H03F3/45278 takes precedence
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

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.

Claims

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.

2. The apparatus according to claim 1, wherein said receive signal comprises one of a radio frequency signal, a microwave signal and a millimeter wave signal.

3. The apparatus according to claim 1, wherein said first gain stage comprises a field effect transistor having a drain node biased by said combiner.

4. The apparatus according to claim 3, wherein said second gain stage comprises another field effect transistor having a gate node configured to acquire said combined signal from said combiner.

5. The apparatus according to claim 1, further comprising an amplifier configured to amplify said cancellation signal prior to said combiner.

6. The apparatus according to claim 5, wherein (i) said first gain stage comprises a field effect transistor having a drain node biased by said combiner and (ii) said amplifier comprises another field effect transistor having a drain node biased by said combiner and wired in parallel to said field effect transistor in said first gain stage.

7. The apparatus according to claim 1, wherein said combiner comprises a wired-OR connection configured to receive both said intermediate signal and said cancellation signal.

8. The apparatus according to claim 1, wherein said circuit that presents said receive signal to said first gain stage is one of a circulator and a receive antenna.

9. The apparatus according to claim 1, further comprising a mixer configured to change a frequency of said combined signal using a local oscillator signal.

10. The apparatus according to claim 1, wherein said cancellation signal conveys greater than zero decibel-milliwatts of peak power.

11. The apparatus according to claim 1, wherein said first gain stage has an input 1 dB compression point of at least 4 decibel-milliwatts.

12. The apparatus according to claim 1, wherein said first gain stage, said combiner and said second gain stage are part of a full duplex wireless transceiver.

13. A method for dual-input low noise amplification, comprising the steps of:

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.

14. The method according to claim 13, wherein said receive signal comprises one of a radio frequency signal, a microwave signal or a millimeter wave signal.

15. The method according to claim 13, further comprising the step of:

amplifying said cancellation signal in an amplifier prior to combination with said intermediate signal.

16. The method according to claim 13, further comprising the step of:

heterodyning said combined signal using a local oscillator signal.

17. The method according to claim 13, wherein said cancellation signal conveys between 10 decibel-milliwatts and 30 decibel-milliwatts of power.

18. The method according to claim 13, wherein said first gain stage has an input 1 dB compression point of at least 4 decibel-milliwatts.

19. The method according to claim 13, wherein the steps are performed in a full duplex wireless transceiver.

20. An apparatus comprising:

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.