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Bipolar Detector Using Minority Storage

IP.com Disclosure Number: IPCOM000094536D
Original Publication Date: 1965-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Schumacher, RA: AUTHOR

Abstract

This circuit produces positive or zero voltage levels at its output terminal 11 according to the binary value represented by bipolar pulses at input 12. A bipolar pulse represents one binary value by a positive half cycle followed by a negative half cycle as illustrated. It represents the other binary value by the opposite sequence of half-cycle polarities.

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Bipolar Detector Using Minority Storage

This circuit produces positive or zero voltage levels at its output terminal 11 according to the binary value represented by bipolar pulses at input 12. A bipolar pulse represents one binary value by a positive half cycle followed by a negative half cycle as illustrated. It represents the other binary value by the opposite sequence of half-cycle polarities.

Diode 13 is connected between input 12 and ground to conduct on negative half cycles. Such prevents the negative portion of a pulse from appearing at output terminal 11. Although negative half cycles do not appear at the output, they condition the circuit to respond to each positive half cycle according to whether it follows or precedes the negative half cycle. During each negative half cycle, diode 13 stores enough charge that it conducts during a positive half cycle that immediately follows a negative half cycle. Thus, for a bipolar pulse comprising a negative half cycle followed by a positive half cycle, diode 13 remains conductive on both half cycles and holds the input 12 at ground level.

The circuit is given appropriate characteristics with respect to the bipolar pulse wave forms for diode 13 to recover its blocking condition to turn off when the first half cycle of a pulse is positive to thus transmit the positive portion of the pulse.

Resistor 14 can be connected to forward bias diode 13 to initially store charge.

A circuit for amplifying the pulses includes tran...