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US 4,542,310 AGranted
CMOS bootstrapped pull up circuit
AssigneeInternational Business Machines Corporation
InventorsWayne F. Ellis, William R. Griffin, Ronald R. Troutman
Life of this patent
Estimating the term…
Abstract
A CMOS driver or pull up circuit is provided which includes a pull up transistor of a given conductivity type and a precharged bootstrap capacitor which discharges fully through a second transistor having a conductivity type opposite to that of the pull up transistor to the control gate or electrode of the pull up transistor. A third transistor may be used to initiate discharge by providing power supply voltage to the control gate of the pull up transistor.
Claims17
A pull up circuit comprising
- a first field effect transistor,
- an impedance serially connected with said transistor at an output terminal disposed between first and second points of reference potential,
- second and third serially arranged field effect transistors connected between said first point of reference potential and a control electrode of said first transistor, said second transistor being of a given conductivity type interposed between said third transistor and said control electrode and said first transistor being of a conductivity type opposite to that of said given conductivity type,
- a first capacitor connected between said output terminal and a common point located between said second and third transistors, and
- means for selectively applying voltage pulses to the control electrodes of said transistors.
2 more elements
A pull up circuit comprising
- first, second and third serially arranged field effect transistors connected between first and second points of reference potential, said second transistor being of a given conductivity type and said first and third transistors being of a conductivity type opposite to that of said given conductivity type transistor,
- a fourth transistor connected between said first point of reference potential and an output terminal and having a control electrode connected to the common point between said second and third transistors,
- a first capacitor connected between said output terminal and the common point between said first and second transistors, and
- means for selectively applying voltage pulses to the control electrodes of said transistors.
1 more element
Dependencies are inferred from the claim text.