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Integrated transmit/receive switch/low noise amplifier with dissimilar semiconductor devices

  • US 5,554,865 A
  • Filed: 06/07/1995
  • Issued: 09/10/1996
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A monolithic T/R switch/LNA having an input port for reception of a radar signal and an output port for delivery of an amplified radar signal, comprising:

  • a semiconductor substrate having a depression;

    a first semiconductor heterostructure having lateral and depressed portions that are carried on said substrate with said lateral portion positioned laterally from said depression and said depressed portion positioned in said depression; and

    a second semiconductor heterostructure carried over said first heterostructure'"'"'s depressed portion;

    wherein said first and second heterostructures are formed in a predetermined semiconductor system that includes at least one semiconductor layer having a first bandgap and at least one semiconductor layer having a second bandgap that is wider than said first bandgap,an amplifier element with an input and an output is formed from one of said first heterostructure'"'"'s lateral portion and said second heterostructure and at least one switching element is formed from the other of said first heterostructure'"'"'s lateral portion and said second heterostructure,said at least one switching element is arranged to selectively couple said amplifier element'"'"'s input and said input port during said radar signal reception and isolate said amplifier'"'"'s input from said input port at other times, andsaid amplifier element'"'"'s output is coupled to said output port.

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