Schneller, verbrauchsarmer Chopper Komparator mit störungsfreier Funktion bei Variation des logischen Schwellwertes der Inverter

Comparateur à commutation à grande vitesse et consommation faible, qui fonctionne sans défauts sous la variation du niveau de déclenchement logique des inverseurs

Chopper comparator showing high speed and low power operations free of malfunction under variation of logical threshold voltage of invertor

Abstract

The present invention also provides a chopper comparator for comparing an analog input signal voltage (Vin) and a comparative reference voltage (Vref). The chopper comparator comprises the following elements. First and second input terminals (8, 9) are provided for receiving the analog input signal voltage (Vin) and the comparative reference voltage (Vref) respectively. A first capacitance (C1) is provided which has a first input side terminal being connected through a first switch (1) to the first input terminal (8). A second capacitance (C2) is provided which has a second input side terminal being connected through a second switch (2) to the second input terminal (9). A data latch circuit (12) is provided which is connected to first and second output terminals of the first and second capacitances (C1, C2). A third switch (3) is provided between the first and second input side terminals of the first and second capacitances (C1, C2), wherein after the first and second switches (1, 2) have turned OFF to discontinue applications of the analog input signal voltage (Vin) and the comparative reference voltage (Vref) to the first and second capacitances (C1, C2) respectively, then the third switch (3) turns ON to form a short circuit between the first and second input side terminals of the first and second capacitances (C1, C2).

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    EP-0886377-A1December 23, 1998Nec CorporationComparateur de tension à commutation
    EP-1267492-A1December 18, 2002Nec CorporationSpannungskomparatorschaltung
    US-6559688-B2May 06, 2003Nec Electronics CorporationVoltage comparing circuit
    US-8922402-B2December 30, 2014Panasonic CorporationOffset correction device of comparator