Accurate hysteretic comparator and method

Details Accurate hysteretic comparator and method Accurate hysteretic comparator and method

2011-03-08

2011-03-08

Lam, Tuan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

C327S065000, C327S066000, C327S067000

Reexamination Certificate

active

07902894

ABSTRACT:
A hysteretic comparator is proposed for comparing input signals and producing an output signal VOT with a hysteresis window Vhys. The hysteretic comparator includes a differential input stage with current output (DICO) having input transistors with transconductance Gmtnxfor converting the input signals, with an input stage transconductance Gmin, into intermediate signal currents. A steerable offset current generator, driven by a steering control signal, steers an offset current source IOS to alternative offset currents. A current-to-voltage summing converter (IVSC) sums up the intermediate signal currents and the offset currents and converts the result into VOT plus the steering control signal causing Vhys=IOS/Gmin. A feedback resistance RNFis connected to the input transistors to form a negative feedback loop. The RNFis sized such that GMin, hence Vhys, becomes essentially solely dependent upon the feedback conductance GNF=1/RNFindependent of the Gmtnxthus its process and environmental variation.

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