Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Signal transmission integrity or spurious noise override
Patent
1998-01-28
1999-12-07
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Signal transmission integrity or spurious noise override
327389, 327437, H03K 1716
Patent
active
059990341
ABSTRACT:
A circuit for controlling a voltage provided to a switching transistor in a voltage conversion buffer which drives a high voltage output with low voltage transistors. The circuit has two elements to it. First, a pull-up circuit pulls the gate of the switching transistor to a high voltage level in response to a first state of a control logic signal. Second, a pull-down circuit pulls the gate of the switching transistor down to an intermediate voltage in response to a second state of the control logic signal. The intermediate voltage is set to be less than the high voltage by no more than approximately the low voltage amount. The pull-down circuit is a transistor connected to a low voltage source, which limits the pull-down voltage. Additional transistors are provided to turn on and off the pull-down transistor, with a circuit connected to a fail-safe low voltage source being used to protect these transistors.
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patent: 5736888 (1998-04-01), Sharpe-Geisler
patent: 5825229 (1998-10-01), Manaresi et al.
"Dynamic Dielectric Protection For I/O Circuits Fabricated in 2.5V CMOS Technology Interfacing to a 3.3V LVTTL Bus", John Connor et al., 1997 Symposium on VLSI Circuits Digest of Technical Papers.
Ganesan Vidyasager
Singh Gajendra P.
Cunningham Terry D.
Sun Microsystems Inc.
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