Receiving apparatus and integrated circuit for receiving

Receiving apparatus and integrated circuit for receiving

  • CN 1,337,787 A
  • Filed: 08/03/2001
  • Published: 02/27/2002
  • Est. Priority Date: 08/04/2000
  • Status: Active Application
First Claim
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1. receiving equipment comprises:

  • A receiving circuit is used to receive and is used one first signal and the secondary signal that different frequency sends;

    A circuit is used to form first and second local oscillated signals, the frequency of these two local oscillated signals all be described first and described secondary signal between centre frequency, and its phase place has 90 °

    difference;

    One first mixer is used for according to described first local oscillated signal, is one first intermediate-freuqncy signal with the received signals frequency inverted that described receiving circuit received;

    One second mixer is used for according to described second local oscillated signal, is one second intermediate-freuqncy signal with the received signals frequency inverted that described receiving circuit received;

    One first phase-shift circuit, wherein said first intermediate-freuqncy signal is provided on it;

    One second phase-shift circuit, wherein said second intermediate-freuqncy signal is provided on it, and the phase shift quantity of its phase shifts quantity and described first phase-shift circuit has 90 °

    difference;

    WithAn addition/subtraction circuit is used for carrying out addition and subtraction between the output signal of the output signal of described first phase-shift circuit and described second phase-shift circuit,Wherein, optionally from described addition/subtraction circuit, extracted with the corresponding intermediate-freuqncy signal of described first signal or with the corresponding intermediate-freuqncy signal of described secondary signal by the processing in the described addition/subtraction circuit is switched to described addition or described subtraction.

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