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Diversity receiver front end system with post-amplifier filters

  • US 10,050,694 B2
  • Filed: 06/10/2015
  • Issued: 08/14/2018
  • Est. Priority Date: 10/31/2014
  • Status: Active Grant
First Claim
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1. A receiving system comprising:

  • a controller configured to selectively activate one or more of a plurality of paths between an input of a first multiplexer and an output of a second multiplexer;

    a plurality of amplifiers, each one of the plurality of amplifiers disposed along a corresponding one of the plurality of paths and configured to amplify a signal received at the amplifier;

    a plurality of pre-amplifier bandpass filters, individual pre-amplifier bandpass filters disposed along a corresponding path of the plurality of paths at an input of a corresponding amplifier of the plurality of amplifiers, individual pre-amplifier bandpass filters configured to filter a signal received at the pre-amplifier bandpass filter to a respective frequency band resulting in out-of-band noise that is amplified by the corresponding amplifier; and

    a plurality of post-amplifier bandpass filters, individual post-amplifier bandpass filters disposed along a corresponding path of the plurality of paths at an output of a corresponding amplifier of the plurality of amplifiers and configured to filter a signal received at the post-amplifier bandpass filter to a respective frequency band and to reduce the out-of-band noise amplified by the corresponding amplifier, an individual pre-amplifier bandpass filter of the plurality of pre-amplifer bandpass filters disposed along a first path of the plurality of paths phase-shifts a signal by a first phase shift and an individual post-amplifier bandpass filter of the plurality of post-amplifer bandpass filters disposed along the first path phase-shifts the signal by a second phase shift that is opposite to the first phase shift.

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