Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1996-12-16
1999-07-27
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 67, 327362, 327 77, 327 89, 327 65, H03K 5153, H03K 508
Patent
active
059296615
ABSTRACT:
A voltage comparator for comparing a first input voltage to a second input voltage includes a first transistor having a gate to which the first input voltage is applied and a second transistor having a gate to which the second input voltage is applied. Third and fourth transistors, coupled to the first and second transistors respectively, each conduct a first current in response to a first reference voltage being applied to a gate of each transistor. A fifth transistor is coupled to the first and second transistors and has a gate to which a second reference voltage is applied to maintain a sum of currents conducted by the first and second transistors equal to a second current. A reference generation circuit is coupled to the third, fourth and fifth transistors and is configured to generate the first and second reference voltages having magnitudes which set the second current equal to twice the first current. A first current difference amplifier has an input coupled to the first and third transistors and is configured to generate one of a first, second and third output voltage levels in response to a sourcing, zero or sinking current, respectively, being received at its input.
REFERENCES:
patent: 5289054 (1994-02-01), Lucas
patent: 5583425 (1996-12-01), Rapp et al.
patent: 5621340 (1997-04-01), Lee et al.
A. Rodriguez-Vazquez et al., "High Resolution CMOS Current Comparators: Design and Applications to Current-Mode Function Generation" Analog Integrated Circuits and Signal Processing, 7, pp. 149-165 (1995).
Le Dinh
National Semiconductor Corporation
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