Patent ID: 6130565
Filing Date: 2000-10-10
Classification: H03L

Abstract:
A charge pump circuit comprising:a charge current generation circuit including:a supply voltage node to which a supply voltage is applied;a ground potential node to which a ground potential is applied;a first input node for receiving a first input signal;a second input node for receiving a second input signal;an output node through which a charge or discharge current flows;a first MOS transistor having a first conductivity type connected at the gate electrode thereof to said first input node, and connected at the source electrode thereof to said supply voltage node; anda second MOS transistor having the first conductivity type, receiving at the gate electrode thereof a first electric potential, and connected between the drain electrode of said first MOS transistor and said output node;a discharge current generation circuit including:a third MOS transistor having the first conductivity type, connected at the gate electrode thereof to said second input node, and connected at the source electrode thereof to said supply voltage node;a fourth MOS transistor having the first conductivity type, connected at the gate electrode thereof to the gate electrode of said second MOS transistor, and connected at the source electrode thereof to the drain electrode of said third MOS transistor; anda current mirror circuit having input circuitry connected to the drain electrode of said fourth MOS transistor and through which an input current flows, said input circuitry includinga fifth MOS transistor having a second conductivity type, receiving at the gate electrode thereof a second electric potential, and connected at the drain electrode thereof to the drain electrode of said fourth MOS transistor; anda sixth MOS transistor having the second conductivity type, connected at the gate electrode thereof to the drain electrode of said fifth MOS transistor, and connected between the source electrode of said fifth MOS transistor and said ground potential node; andoutput circuitry connected to said output node and through which an output current, corresponding to the input current flowing through the input circuitry, flows, said output circuitry includinga seventh MOS transistor having the second conductivity type, connected at the sate electrode thereof to the gate electrode of said fifth MOS transistor, and connected at the drain electrode thereof to the output node; andan eighth MOS transistor having the second conductivity type, connected at the gate electrode thereof to the gate electrode of said sixth MOS transistor, and connected between the source electrode of said seventh MOS transistor and said ground potential node.