JPS6157111A - Comparator - Google Patents

Abstract

PURPOSE: To extract any positive or negative phase by constituting a window comparator with a single constant current source so as to reduce power consumption.

CONSTITUTION: When an input voltage VIN is lower than a set voltage VL. transistors (TR)Q₁₂, Q₁₄ are turned on, a current from a constant current source 5 flows from the Q₁₂ to the Q₁₄ and an output VOUT of the Q₁₅ goes to L. On the other hand, a Q₁₃ is turned off and an output -VOUT of a Q₁₆ goes to H. When the VIN is between the VL and VH, the Q₁₂, Q₁₃ are turned on, the Q₁₁, Q₁₄ are turned off, the VOUT goes to H and the -VOUT goes to L. When the VIN exceeds the VH, only the Q₁₁ is turned on, the VOUT goes to L and the -VOUT goes to H.

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