Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-06-06
2006-06-06
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S513000, C327S543000, C323S316000, C330S261000
Reexamination Certificate
active
07057444
ABSTRACT:
Various embodiments of a voltage level detector implemented as an integrated circuit whose trip point is approximately constant over variations in temperature as well as variations in transistor fabrication parameters are disclosed along with a differential amplifier whose input offset voltage is highly immune to said variations. In one embodiment, a voltage generator supplies a composite voltage to the gate of the tail current transistor of the voltage level detector or differential amplifier. The first component of the voltage is approximately equal to the threshold voltage of NMOS transistors comprised in the device over variations in operating temperature as well as variations in transistor fabrication parameters while the second component is approximately constant with respect to said variations. When applied to the gate of the tail current transistor, the first component may turn the transistor on in spite of the above-mentioned parametric variations.
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Callahan Timothy P.
Englund Terry L.
Hood Jeffrey C.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Standard Microsystems Corporation
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