Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Reexamination Certificate
2007-05-29
2007-05-29
Nguyen, Long (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
C326S068000, C326S081000
Reexamination Certificate
active
10982729
ABSTRACT:
A high voltage level shifter having a cost effective design that saves chip architecture and power. The high voltage level-shifter includes a resistor connected between a first node and a first power supply rail. An inverter couples to receive an input signal to provide an inverted input signal. A first circuit portion couples to receive the inverted input signal and connects between the first power supply rail and a second power supply rail for converting a high voltage signal into a low voltage signal. The first circuit portion includes a first clamp circuit, wherein the first circuit portion is biased through the first clamp circuit and the first node. A second circuit portion couples to receive the input signal and connects between the first power supply rail and a second power supply rail for converting a low voltage signal into a high voltage signal. The second circuit portion includes a second clamp circuit, wherein the second circuit portion is biased through the second clamp circuit and the first node. The second circuit portion provides a first internal bias for the first circuit portion and the first circuit portion provides a second internal bias for the second circuit portion. This high voltage level-shifter provides level shifting a low voltage signal (<5V) to a high voltage signal (˜40V), with no static power dissipation while still protecting all devices.
REFERENCES:
patent: 5027014 (1991-06-01), Bass et al.
patent: 5896043 (1999-04-01), Kumagai
patent: 6864718 (2005-03-01), Yu
Brady W. James
Kempler William B
Nguyen Long
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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