Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-08-27
2000-05-16
Kim, Jung Ho
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
363 60, H03K 300
Patent
active
060642513
ABSTRACT:
A low voltage charge pump system with a large output voltage range is described. The charge pump system comprises eight charge pump stages, an output stage, and a four phase clock generator. The clock generator generates two sets of four phase shifted signals. The first set of four clock signals are coupled to the first four charge pump stages and have a logic high level of VCC. The second set of clock signals are coupled to the second four charge pump stages and have a logic high level of 2 VCC. Due to the body effect, the negative voltages at the charge pump output stages increases the threshold voltage of a pass transistor which couples the input and output in each charge pump. The larger high voltage level of the second set of clock signals enables the signals to overcome the body effect increased threshold voltages of the pass transistors. The pass transistors are then used to couple negative charge to the next charge pump stage, and positive charge to the preceding charge pump stage. The present invention charge pump system can thereby provide a large negative voltage output using a low power supply voltage. In the charge pump stages that receive the higher clock levels and in the output stage, the well of capacitor configured PMOS transistors that are coupled to the stage clock terminals is coupled to the source and drain of the transistors. Coupling the source, drain and well together prevents the 2 VCC voltage high level clock signals from forward biasing the p-n junction formed by the source and drain with the well. The charge pump stages and the output stage also include a p-n junction diode coupled from the output of the stage to ground.
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patent: 5589793 (1996-12-01), Kassapian
patent: 5818289 (1998-10-01), Chevallier et al.
patent: 5821805 (1998-10-01), Jinbo
Integrated Silicon Solution Inc.
Kim Jung Ho
LandOfFree
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