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Efficient Precharge Ring Oscillator

IP.com Disclosure Number: IPCOM000044511D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Delecki, JJ: AUTHOR

Abstract

An efficient precharge ring oscillator is a circuit that is used to generate self-sustaining, high frequency clock pulses that are used for substrate biasing or logic operations. The ring oscillator (Fig. 1) replaces each passive load R1, R2 and R3 (Fig. 2) with an active load comprising two transistors and a capacitor. R1 has been replaced by T1, T2 and C1, R2 by T4, T5 and C2, and R3 by T7, T8 and C3. Each capacitor is connected to the input of the previous stage. Therefore, it is possible to drive the output devices T2, T5 and T8 hard into the linear region prior to turning the hold-down devices T3, T6 and T9, off.

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Efficient Precharge Ring Oscillator

An efficient precharge ring oscillator is a circuit that is used to generate self- sustaining, high frequency clock pulses that are used for substrate biasing or logic operations. The ring oscillator (Fig. 1) replaces each passive load R1, R2 and R3 (Fig. 2) with an active load comprising two transistors and a capacitor. R1 has been replaced by T1, T2 and C1, R2 by T4, T5 and C2, and R3 by T7, T8 and C3. Each capacitor is connected to the input of the previous stage. Therefore, it is possible to drive the output devices T2, T5 and T8 hard into the linear region prior to turning the hold-down devices T3, T6 and T9, off. This permits an exceptional use of the bootstrap technique allowing smaller output devices T2, T5 and T8 than would be necessary to generate the desired ring frequency if the standard configuration is used, that is, a source/gate bootstrap capacitor. Smaller output devices result in lower standby power dissipation and flexibility in designing out performance skew caused by process variations.

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