Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1995-06-06
1999-03-30
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327537, 327538, G05F 110
Patent
active
058894284
ABSTRACT:
A charge pump for increasing the value of an input voltage includes a plurality of serially coupled charge pump stages, wherein each charge pump stage includes a P-channel pass transistor coupled to a first end of a capacitor. The gates of the P-channel pass transistors and the second ends of the capacitors in odd-numbered charge pump stages receive a first phase clock signal, and the gates of the pass transistors and the second ends of the capacitors in even-numbered charge pump stages receive a second phase clock signal, except that the second end of the capacitor in the last charge pump stage is coupled to ground. To increase the value of the capacitors in an integrated circuit embodiment all of the capacitors, except for the capacitor in the last stage, are ideally ferroelectric capacitors. In a preferred embodiment, the charge pump is one component in a regulated charge pump system that also includes a voltage regulator and a controlled oscillator. In operation, the voltage regulator determines whether the boosted output voltage is greater or less than a predetermined target output voltage and accordingly selectively controls the operation of the oscillator. In turn, the charge pump is enabled to selectively charge pump the input voltage to provide a boosted output voltage if the boosted output voltage is less than a predetermined low target output voltage. Charge pumping is disabled if the boosted output voltage is greater than a predetermined high target output voltage.
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On-Chip High-Voltage Generation in MNOS Integrated Circuits Using an Improved Voltage Multiplier Technique, IEEE Journal of Solid-State Circuits, vol. SC-11 No. 3, Jun. 1976, Dickson.
Callahan Timothy P.
Kim Jung Ho
Kubida William J.
Meza Peter J.
Ramtron International Corporation
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