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Parametric Amplifier

IP.com Disclosure Number: IPCOM000098522D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Landauer, RW: AUTHOR

Abstract

The parametric amplifier comprises a crystal 10 of ferroelectric material having high non linear capacitance on which four electrodes 12, 14, 16 and 18 are mounted. Each of the electrodes 12, 14 and 16 form with the electrode 18 a transmission line. These three transmission lines handle the three frequencies required for parametric amplification, that is, the pump, the signal and the idling frequencies. The pump frequency is applied by generator 20 to the transmission line formed by electrodes 12 and 18 and the signal frequency is applied by generator 22 to the transmission line formed by electrodes 16 and 18. Coupling between the large and small signals is produced by the interaction of the electrical fields in the body of ferroelectric material which forms the dielectric for each of the three transmission lines.

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Parametric Amplifier

The parametric amplifier comprises a crystal 10 of ferroelectric material having high non linear capacitance on which four electrodes 12, 14, 16 and 18 are mounted. Each of the electrodes 12, 14 and 16 form with the electrode 18 a transmission line. These three transmission lines handle the three frequencies required for parametric amplification, that is, the pump, the signal and the idling frequencies. The pump frequency is applied by generator 20 to the transmission line formed by electrodes 12 and 18 and the signal frequency is applied by generator 22 to the transmission line formed by electrodes 16 and 18. Coupling between the large and small signals is produced by the interaction of the electrical fields in the body of ferroelectric material which forms the dielectric for each of the three transmission lines.

The capacitance of crystal 10 varies in accordance with the bias voltage applied across the material. Three bias batteries 26, 28 and 30 apply different biases to the three transmission lines. Each of these batteries provides a bias which is proper to render the capacitance of the line such that the length of the line is equal to one half wave length for the frequency accommodated on that line. Thus, battery 28 biases the line formed by electrodes 14 and 18 so that the capacitance of this transmission line is such that the length of the line is equal to one half wave length of the idling frequency. Batteries 26 and 30 similarly bias...