Circuit for generating a pumping signal for a surface elastic wave parametric device in a receiver

• US 4,426,737 A
• Filed: 02/03/1982
• Issued: 01/17/1984
• Est. Priority Date: 02/06/1981
• Status: Expired due to Fees

• Current Assignee: Clarion Co., Ltd. (Faurecia SA)
• Original Assignee: Clarion Co., Ltd. (Faurecia SA)
• Inventors: Mori, Masaharu
• Primary Examiner(s): NG, JIN FAY
• Application Number:
  US06/345,507
• Time in Patent Office: 713 Days
• Field of Search: 455/260, 455/266, 455/280, 455/284, 455/293, 455/295, 455/296, 455/302, 455/311, 455/341, 455/323, 455/325, 330/4.9, 330/5.5
• US Class Current: 455/260
• CPC Class Codes: H03F 13/00 Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier
• CPC Class Codes: H04B 1/26 for superheterodyne receivers multiple frequency-changing H03D7/16

Abstract

A receiver is provided with a surface elastic wave amplifier of a parametric amplification type within an HF amplifier unit, and with a circuit for providing pumping power for said surface elastic wave amplifier from oscillating outputs of an IF converting local oscillator of the receiver.

Claims

1. A receiver for receiving signals at a selected frequency, comprising a high frequency amplifier, means for supplying a high frequency signal to an input of said high frequency amplifier, a first local oscillator, and means responsive to said first local oscillator and to said high frequency amplifier for converting a high frequency signal from an output of said high frequency amplifier to an intermediate frequency signal, said high frequency amplifier including a surface elastic wave parametric amplifier and pumping power supply means for supplying a pumping input of said surface elastic wave parametric amplifier with a pumping signal, said pumping power supply means including a frequency doubler circuit connected to said first local oscillator, a second local oscillator, mixer means for mixing an output of said second local oscillator and a signal from an output of said frequency doubler circuit, and filter means connected to an output of said mixer means and coupled to said pumping input of said surface elastic wave parametric amplifier for passing only signals having a frequency which is substantially twice said selected frequency, said filter means including a plurality of filters having pass bands with different center frequencies and switching means for coupling to said output of said mixer means and said pumping input of said surface elastic wave parametric amplifier a respective said filter having a pass band center frequency which is substantially twice said selected frequency.

2. A receiver for receiving signals at a selected frequency, comprising a high frequency amplifier, means for supplying a high frequency signal to an input of said high frequency amplifier, a local oscillator, and frequency converting means responsive to said first local oscillator and to said high frequency amplifier for converting a high frequency signal from an output of said high frequency amplifier to an intermediate frequency signal, said high frequency amplifier including a surface elastic wave parametric amplifier and pumping power supply means for supplying a pumping input of said surface elastic wave parametric amplifier with a pumping signal, said local oscillator including a reference oscillator and said pumping power supply means including a first phase locked loop circuit, said first phase locked loop circuit including a first phase comparator having an input connected to said reference oscillator, a first voltage controlled oscillator responsive to an output of said first phase comparator, a first buffer amplifier circuit responsive to an output of said first voltage controlled oscillator and having an output coupled to said pumping input of said surface elastic wave parametric amplifier, and a first frequency divider having an input connected to said output of said first buffer amplifier circuit and an output connected to a further input of said first phase comparator.

3. The receiver according to claim 2, wherein said frequency converting means includes a mixer circuit and said local oscillator includes a second phase locked loop circuit, said second phase locked loop circuit including a second phase comparator having an input connected to said reference oscillator, a second voltage controlled oscillator responsive to an output of said second phase comparator, a second buffer amplifier circuit responsive to an output of said second voltage controlled oscillator and having an output connected to an input of said mixer circuit, and a second frequency divider having an input connected to said output of said second buffer amplifier circuit and an output connected to a further input of said second phase comparator.