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Provision of Third Harmonic Waveform in Josephson Logic Circuits

IP.com Disclosure Number: IPCOM000052816D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Anacker, W: AUTHOR

Abstract

It is well known that in Josephson latching logic networks power dissipation of the AC power supply could be significantly reduced if a third harmonic waveform of proper amplitude and phase were added. Unfortunately, it is difficult, if not impossible, to maintain the clean third harmonic waveshape through a transformer tree system because of different phase shifts of fundamental and third harmonics.

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Provision of Third Harmonic Waveform in Josephson Logic Circuits

It is well known that in Josephson latching logic networks power dissipation of the AC power supply could be significantly reduced if a third harmonic waveform of proper amplitude and phase were added. Unfortunately, it is difficult, if not impossible, to maintain the clean third harmonic waveshape through a transformer tree system because of different phase shifts of fundamental and third harmonics.

This article describes a means to overcome the drawback. For the implementation of an n-level transformer tree power distribution system, two separate transformer trees of depth n-1 are provided, one for the fundamental frequency f and the other for the frequency 3f.

The transformers of the fourth level are equipped with two primary and the standard secondary windings to be connected to regulator strings. One primary of each of these transformers is then connected to its associated f-tree transformer secondary of level n-1, and the other primary is connected to its associated 3f-tree transformer secondary of level n-1. In consequence, the magnetic flux seen by the secondaries of transformer level n will be of proper superposition of fundamental and third harmonic, leading to the desired result. Proper phase relationship can be readily obtained in this scheme by a single phase shift circuit at the output of the primary sine-wave generator, either on the f or the 3f output.

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