Charge pump circuit with multiple boost stages

Electrical transmission or interconnection systems – Capacitor – Parallel-charge – series-discharge

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327306, 327536, 363 60, H02M 318

Patent

active

057604975

ABSTRACT:
A charge pump circuit includes a plurality of voltage boost stages that are mutually parallel-connected between a supply line and an output line. Each of the stages includes first and second charge storing devices in each of which a first terminal is connected to a charge/discharge node and a second terminal is connected to a boost node to switch between a first charge state and a second charge state for transferring a charge to the output line. Each stage also includes an inverter with an input node connected to the boost node related to the first charge storing device and an output node which is connected to the boost node related to the second charge storing device. Further, a first charge transfer diode, which is connected between the charge/discharge node related to the first charge storing device and the output line and a second charge transfer diode, which is connected between the charge/discharge node related to the second charge storing device and the output line are also included in each stage. Each one of the voltage boost stages includes an additional diode that is connected between the charge/discharge node related to the first charge storing device and the output line. The additional diode discharges the first charge storing device when a potential of the output line is lower than a potential, minus the threshold of the additional diode, of the charge/discharge node related to the first charge storing device.

REFERENCES:
patent: 5036229 (1991-07-01), Tran
patent: 5191232 (1993-03-01), Wang
patent: 5301097 (1994-04-01), McDaniel
patent: 5532653 (1996-07-01), Adkins
patent: 5574634 (1996-11-01), Parlour et al.
patent: 5650671 (1997-07-01), Pascucci et al.
European Search Report from European Patent Application 95830335.6, filed Jul. 28, 1995.

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