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Browse Prior Art Database

Light Powered Oscillator

IP.com Disclosure Number: IPCOM000098392D
Original Publication Date: 1960-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Miller, SL: AUTHOR

Abstract

The light powered oscillator includes a light source 1, a photovoltaic cell 2 connected in series with an Esaki diode 3 and a reactive element 4 which comprises the primary of an output transformer having a secondary 5. The arrangement provides a very high frequency oscillator.

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Light Powered Oscillator

The light powered oscillator includes a light source 1, a photovoltaic cell 2 connected in series with an Esaki diode 3 and a reactive element 4 which comprises the primary of an output transformer having a secondary 5. The arrangement provides a very high frequency oscillator.

The series resistance of the cell 2 must be smaller than the negative resistance of the diode 3. The short circuit current of the cell 2 must be greater than the peak current of the diode 3. The open circuit potential of the cell 2 must be selected so that the characteristics of the cell 2 and diode 3 intersect within the negative resistance region of the Esaki diode characteristic. This is shown in the right hand drawing where curves 6 and 7 are the characteristic curves of the cell 2 and diode 3, respectively.

If the foregoing three requirements are met, the circuit oscillates. Variations of intensity of the light impinging on the cell 2 varies the potential supplied by the cell, which varies the frequency of the oscillator.

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