US 11,539,337 B2 · Amplifier with input bias current cancellation

Abstract

An amplifier includes a first input transistor, a second input transistor, a first cascode transistor, a second cascode transistor, a first current mirror circuit, and a second current mirror circuit. The first input transistor is coupled to a first input terminal. The second input transistor is coupled to a second input terminal and the first input transistor. The first cascode transistor is coupled to the first input transistor. The second cascode transistor is coupled to the second input transistor and the first cascode transistor. The first current mirror circuit is coupled to the first cascode transistor, the second cascode transistor, and the first input terminal. The second current mirror circuit is coupled to the first cascode transistor, the second cascode transistor, and the second input terminal.

Claims9

Dependent claims

An amplifier, comprising:

a first input transistor coupled to a first input terminal;
a second input transistor coupled to a second input terminal and the first input transistor;
a first cascode transistor coupled to the first input transistor;
a second cascode transistor coupled to the second input transistor and the first cascode transistor;
a first current mirror circuit directly coupled to the first cascode transistor, directly coupled to the second cascode transistor, and coupled to the first input terminal;
and
a second current mirror circuit directly coupled to the first cascode transistor, directly coupled to the second cascode transistor, and coupled to the second input terminal.

4 more elements

An amplifier input stage, comprising:

a first input transistor, comprising a first terminal coupled to a first signal input terminal;
a second input transistor, comprising:
a first terminal coupled to a second signal input terminal;
and
a second terminal coupled to a second terminal of the first input transistor;
a first cascode transistor comprising a first terminal coupled to a third terminal of the first input transistor;
a second cascode transistor comprising:
a first terminal coupled to a third terminal of the second input transistor;
and
a second terminal coupled to a second terminal of the first cascode transistor;
a first current mirror circuit directly coupled to the second terminal of the first cascode transistor, directly coupled to the second terminal of the second cascode transistor, and coupled to the first terminal of the first input transistor;
and
a second current mirror circuit directly coupled to the second terminal of the first cascode transistor, directly coupled to the second terminal of the second cascode transistor, and coupled to the first terminal of the second input transistor.

10 more elements

Dependencies are inferred from the claim text.

Amplifier with input bias current cancellation

Life of this patent

Amplifier with input bias current cancellation

Life of this patent

Abstract

Claims9