Browse Prior Art Database

Clock and Data Retrieval Circuit

IP.com Disclosure Number: IPCOM000096377D
Original Publication Date: 1963-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Fang, Y: AUTHOR [+3]

Abstract

From a train of input pulses this circuit extracts clock pulses as well as data pulses.

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Clock and Data Retrieval Circuit

From a train of input pulses this circuit extracts clock pulses as well as data pulses.

A train of input pulses A containing clock pulses a and data pulses b, indicative of a binary 0, is applied to a monostable multivibrator 10. This multivibrator has a time constant, determined by a time constant control circuit, suitable for providing the output pulses B. These serve as clock output pulses, in response to only the clock pulses a. The multivibrator 10 is unresponsive to the data pulses b by properly controlling, by a recovery time control circuit, the charging current in multivibrator 10.

The multivibrator output pulses B are converted by a differentiating network 12 into differentiated output pulses C. A gate pulse network 14 responsive to the negative spikes of the differentiated output pulses C produces gating pulses D for a gated multivibrator or single pulse generator 16. The train of input pulses A is passed through delay 18 to provide a train of delayed input pulses E. Thus, the clock pulses a of the train of delayed input pulses E are applied to the gated multivibrator 16 when 16 is rendered inoperative by the gating pulses D. Thus, gated multivibrator 16 produces data output pulses F only in response to the data pulses b of the train of delayed input pulses E.

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