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Multiplying-saw-phase-shift-envelope-detector

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Multiplying saw phase shift envelope detector

Details

Inventors: Papadopoulos, Costas;
Assignee: Whistler Corporation (Westford, MA)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Faile; Andrew
Attorney, Agent or Firm: Weingarten, Schurgin, Gagnebin & Hayes

A radio-frequency detection apparatus including a signal input for providing an input signal and a phase shifter having a first connection and a second connection. The phase shifter includes a SAW device having a first electrical connection and a second electrical connection, wherein the SAW first electrical connection is coupled to the phase shifter first connection and the SAW second electrical connection is coupled to the phase shifter second connection. The radio-frequency detection apparatus also includes a multiplier having a multiplier first input connection, a multiplier second input connection and at least one multiplier output connection, the multiplier first input connection being coupled to the signal input and the phase shifter first connection and the multiplier second input connection being coupled to the phase shifter second connection. The phase shifter introduces approximately a 90 degree phase shift into the input signal at approximately the frequency of minimum insertion loss.

DETAILED DESCRIPTION A radio-frequency deflection apparatus is disclosed which includes a signal input for providing an input signal and a phase shifter having a first connection and a second connection; the phase shifter is coupled to a SAW device having a first electrical connection and a second electrical connection.
The SAW first electrical connection is coupled to the phase shifter first connection and the SAW second electrical connection is coupled to the phase shifter second connection.
The apparatus also includes a multiplier having a multiplier first input connection, a multiplier second input connection and at least one multiplier output connection.
The multiplier first input connection is coupled to the signal input and the phase shifter first connection and the multiplier second input connection is coupled to the phase shifter second connection.
The phase shifter is adapted for introducing approximately a 90 degree phase shift into the input signal at the frequency of minimum insertion.
A radio-frequency receiver is also disclosed which includes an antenna; a local oscillator multiplier having a local oscillator multiplier first input terminal, a local oscillator multiplier second input terminal and a local oscillator multiplier output terminal, the local oscillator multiplier first input terminal being coupled with the antenna; a local oscillator, the local oscillator being coupled with the local oscillator multiplier second input terminal; and a bandpass filter amplifier having a bandpass filter amplifier input terminal and a bandpass filter amplifier output terminal.
The bandpass filter amplifier input terminal is coupled with the local oscillator multiplier output terminal.
The receiver also includes a phase shifter having a first terminal and a second terminal, the phase shifter including a SAW device having a first electrical terminal and a second electrical terminal.
The SAW first electrical terminal is coupled to the phase shifter first terminal and the SAW second electrical terminal is coupled to the phase shifter second terminal

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