US 2009/0153126 A1 · CURRENT MIRROR CIRCUIT

Abstract

The present invention discloses a current mirror circuit generating an output current flowing through an output current path according to an input current flowing through an input current path. The current mirror circuit comprises a P type transistor in the output current path, an operational amplifier, and a basic circuit. The operational amplifier has a negative input coupled to a node receiving the input current, a positive input coupled to a drain of the P type transistor, and an output coupled to a gate of the P type transistor. The basic circuit comprises a first transistor in the input current path and a second transistor in the output current path. The first transistor has a gate and a drain coupled together. The second transistor has a gate coupled to the gate of the first transistor.

Claims11

Dependent claims

A current mirror circuit generating an output current flowing through an output current path according to an input current flowing through an input current path, comprising:

a P type transistor in the output current path;
an operational amplifier having a negative input coupled to a first node receiving the input current, a positive input coupled to a drain of the P type transistor, and an output coupled to a gate of the P type transistor;
and
a basic circuit comprising:
a first transistor in the input current path, the first transistor having a gate and a drain coupled together;
and
a second transistor in the output current path, the second transistor having a gate coupled to the gate of the first transistor.

4 more elements

Dependencies are inferred from the claim text.

Current mirror circuit

Life of this patent

Current mirror circuit

Life of this patent

Abstract

Claims11