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US 9,054,654 B2Granted
Differential amplifier circuit having plural current mirror circuits
AssigneePS4 Luxco S.a.r.l.
InventorHitoshi Tanaka
Life of this patent
Estimating the term…
Abstract
Disclosed herein is a differential amplifier circuit that includes: first and second transistors coupled to form a differential circuit; a first current mirror circuit generating first and second currents in response to a third current flowing through the first transistor; and a second current mirror circuit generating a fourth current in response to a fifth input current. A sum of the second and fourth currents flowing through the second transistor.
Claims15
A device comprising:
- first and second input terminals;
- first and second power-supply terminals;
- a first current path including:
- a first node;
- a first transistor coupled between the first power-supply terminal and the first node and having a control electrode coupled to the first node;
- and
- a second transistor coupled between the second power-supply terminal and the first node and having a control electrode coupled to the first input terminal;
- a second current path including:
- a second node;
- a third transistor coupled between the first power-supply terminal and the second node and having a control electrode coupled to the second node;
- a fourth transistor coupled between the second power-supply terminal and the second node and having a control electrode coupled to the second input terminal;
- and
- a fifth transistor coupled between the first power-supply terminal and the second node and having a control electrode coupled to the first node;
- and
- a first current mirror circuit generating a first output current based on a first input current flowing through the first transistor;
- a second current mirror circuit generating a second output current based on a second input current flowing through the third transistor;
- a third current mirror circuit generating a third output current based on one of the first and second output currents;
- an output node through which a difference current between the other of the first and second output currents and the third output current flows;
- and
- a driver transistor coupled between the first and second power-supply terminals, the driver transistor having a control electrode coupled to the output node.
17 more elements
A device comprising:
- first and second transistors coupled to form a differential circuit;
- a first current mirror circuit generating first and second currents in response to a third current flowing through the first transistor;
- a second current mirror circuit generating a fourth current in response to a fifth current,
- a sum of the second and fifth currents flowing through the second transistor;
- and
- a third current mirror circuit including an input node coupled to receive the fifth current and an output node coupled to receive the first current;
- and
- a driver transistor having a control electrode coupled to the output node.
5 more elements
A method comprising:
- generating first and second currents at a first current mirror circuit in response to a third current flowing through a first transistor coupled to a second transistor to form a differential circuit;
- generating a fourth current at a second current mirror circuit in response to a fifth input current, where a sum of the second and fifth currents flow through the second transistor;
- and
- providing the fifth current to an input node of a third current mirror having an output node coupled to receive the first current, where the output node is coupled to a control electrode of a driver transistor.
1 more element
Dependencies are inferred from the claim text.