Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1995-03-31
1996-11-19
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327530, 327543, G05F 110
Patent
active
055766560
ABSTRACT:
An output driver circuit for an integrated circuit is disclosed, where the output driver drives an output terminal with a high logic level having a voltage limited from the power supply voltage of the integrated circuit. The limited voltage is provided by applying a limited output high voltage to an output buffer, such that the drive signal applied to the gate of the pull-up transistor in the output driver is limited by the limited output high voltage applied to the output buffer. A voltage reference and regulator circuit for generating the limited output high voltage, or for generating a reference voltage for application to a circuit other than an output buffer and that demands sink current, is also disclosed. The voltage reference and regulator is based on a current mirror, in which the sum of the current in the current mirror is controlled by a bias current source which may be dynamically controlled within the operating cycle or programmed by way of fuses. A sink current path circuit, according to various alternatives, is disclosed as providing an additional sink current path in the event that the limited output high voltage, or reference voltage, exceeds the desired level.
REFERENCES:
patent: 5361003 (1994-11-01), Roberts
patent: 5444397 (1995-08-01), Wong et al.
Anderson Rodney M.
Callahan Timothy P.
Galanthay Theodore E.
Larson Renee M.
SGS-Thomson Microelectronics Inc.
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