Apparatus for comparing an input voltage with a threshold...

Details Apparatus for comparing an input voltage with a threshold... Apparatus for comparing an input voltage with a threshold...

2005-04-26

2005-04-26

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S053000

Reexamination Certificate

active

06885224

ABSTRACT:
An apparatus for comparing an input voltage with a threshold voltage includes: (a) a first current mirror device that includes a first bipolar transistor with a first base and a first collector; the first base and the first collector establish a diode-connected first collector; the input voltage is received at the first current mirror device; (b) a second current mirror device that includes a second bipolar transistor with a second base and a second collector; the second base and the second collector establish a diode-connected second collector; (c) a first impedance coupled in series with the diode-connected first collector and the diode-connected second collector; and (d) a second impedance coupled between ground and the second current mirror device. The first and second current mirror devices are coupled with an output locus at which output signals appear to indicate relative voltage levels of the input and the threshold voltages.

REFERENCES:
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“A Simple Three-Terminal IC Bandgap Reference”, by A. Paul Brokaw; IEEE Journal of Solid-State Circuits; Dec. 1974; pp. 388-393.

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