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Single Shot Amplifier

IP.com Disclosure Number: IPCOM000098521D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Landauer, RW: AUTHOR

Abstract

The transmission line is formed by a crystal 10 of ferroelectric material on which there are mounted two electrodes 12 and 14. The ferroelectric crystal exhibits a high degree of non linear capacitance. This is accentuated by operating it at a temperature just above its Curie temperature and applying proper biasing potential. Single shot type parametric operation is achieved by two different modes of operation. In each, the large pumping signal has a lower frequency than the small signal which is to be amplified.

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Single Shot Amplifier

The transmission line is formed by a crystal 10 of ferroelectric material on which there are mounted two electrodes 12 and 14. The ferroelectric crystal exhibits a high degree of non linear capacitance. This is accentuated by operating it at a temperature just above its Curie temperature and applying proper biasing potential. Single shot type parametric operation is achieved by two different modes of operation. In each, the large pumping signal has a lower frequency than the small signal which is to be amplified.

In the first mode, the small signal is applied to the right end of the line and propagates from right to left. The larger, low frequency pump signal is applied at the left. The pump signal decreases the capacitance of the line as it propagates from left to right. The small signal sees this decrease in capacitance as the signals pass through each other and is amplified and, at the same time, its frequency is increased, The small signal output is taken at the left hand end of the line. The lower frequency pump signal is pumped into and out of the line through a low pass filter.

A similar type of amplification is achieved by applying the small signal to be amplified in the same way, then applying the larger, low frequency pump signal in such a way as to reduce the capacitance along the entire line at one time. In this way, the change in capacitance effected by the pump signal varies with time only and not with space along the line. Aga...