Browse Prior Art Database

DC Restoration with a Shorted Delay Line

IP.com Disclosure Number: IPCOM000092874D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Schumacher, RA: AUTHOR

Abstract

The memory sense amplifier has its input terminal connected to receive signals produced by magnetic storage elements during a read operation. At its output terminal it produces voltage levels that signify the logic values read from a storage element. The sense amplifier includes an amplifier that amplifies the signals to a suitable level to be operated on by a detector circuit.

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DC Restoration with a Shorted Delay Line

The memory sense amplifier has its input terminal connected to receive signals produced by magnetic storage elements during a read operation. At its output terminal it produces voltage levels that signify the logic values read from a storage element. The sense amplifier includes an amplifier that amplifies the signals to a suitable level to be operated on by a detector circuit.

Because the amplifier is AC coupled, it is desirable to maintain a direct voltage reference level at the input to the detector. A signal is preceded by a large noise voltage. In response to this noise voltage, the coupling capacitors of the amplifier charge to a high voltage. This voltage appears at the detector input and it tends to persist into the time when the signal is to be detected.

The sense amplifier has a short-circuited transmission line connected between the detector input and ground. This connection tends to maintain the detector input at ground potential. The line is one-half as long as the width of signal to be detected. As the trailing edge of the signal appears at the detector input, the leading edge of the signal reflected by the delay line appears at the input. The line substantially suppresses noise voltages that are longer than the signal.

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