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Multiport amplifier input network with compensation for output network gain and phase frequency response imbalance

  • US 10,320,349 B1
  • Filed: 03/20/2018
  • Issued: 06/11/2019
  • Est. Priority Date: 12/06/2017
  • Status: Active Grant
First Claim
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1. An amplifier system, comprising:

  • an input network having a plurality of input ports;

    an output network having a plurality of output ports;

    a plurality of amplification units coupled between the input network and the output network, the plurality of amplification units configured to amplify signals from the plurality of input ports;

    a plurality of equalizers, each coupled between the input network and the output network in series with a corresponding one of the amplification units and configured to equalize signal path of the corresponding amplification unit between the input ports and the output ports; and

    one or more calibration circuits configured to generate a calibration signal and inject the calibration signal into a plurality of the paths between the input ports and the output ports before the equalizers concurrently with the amplifier system propagating one or more user signals along the paths between the input ports and the output ports, the calibration signal being a spread spectrum signal with a power level lower than a noise floor of the one or more user signals, the one or more calibration circuits further configured to receive the injected calibration signal from one or more of the output ports after propagation through the amplifier system and perform a comparison of the injected calibration signal to the calibration signal after propagating through the amplifier system.

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