Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-02-11
1999-06-29
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327534, 327536, G05F 302
Patent
active
059173670
ABSTRACT:
There is provided an improved high-voltage generation circuit for use in a mixed signal circuit for multiplying an external power supply potential applied on its input to produce a higher output voltage at an output terminal. The high-voltage generation circuit is formed of a voltage multiplier circuit (114), a voltage comparator circuit (116), and switching circuitry (118). The voltage multiplier circuit is formed of a first stage (122) and at least one second stage (124) connected in series between the input terminal and the output terminal. The second stage is formed of a CMOS transistor (MP4) whose substrate is connected to a controlled node (N23). The voltage comparator circuit compares the external power supply potential and the output voltage and generates a control logic signal. The switching circuitry is responsive to the control logic signal for automatically connecting the controlled node to one of the external power supply potential and the output voltage so as to avoid forward-biasing of the substrate. As a result, there is achieved power savings and thus enhanced performance.
REFERENCES:
patent: 5689209 (1997-11-01), Williams et al.
Advanced Micro Devices , Inc.
Chin Davis
Cunningham Terry D.
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