US 8,026,767 B2 · Adaptive bias circuit and system thereof

Abstract

An adaptive bias circuit which provides a more sensitive adaptive bias current with respect to power level is used for biasing an electronic circuit. The adaptive bias circuit has a first transistor coupled to a power supply, a voltage bias circuit coupled to the first transistor and the power supply biasing the first transistor, and a first power coupling module coupled to the first transistor and the electronic circuit for coupling a portion of input signal power to the first transistor. A second transistor is coupled to the first transistor and the power supply to increase the current gain of the adaptive bias circuit, and a second current coupling module is coupled to the second transistor and the electronic circuit to provide adaptive bias current to the electronic circuit.

Claims25

Dependent claims

An adaptive bias circuit for an electronic circuit including an input signal terminal, comprising:

a first transistor having a first terminal, a second terminal coupled to a first power supply, and a third terminal;
a bias circuit coupled to the first terminal of the first transistor and a second power supply for providing a bias to the first transistor;
a first coupling module having a first terminal coupled to the third terminal of the first transistor, and a second terminal coupled to an input of the electronic circuit for coupling input signal power to the third terminal of the first transistor;
a second transistor having a first terminal coupled to the third terminal of the first transistor, a second terminal coupled to a third power supply, and a third terminal;
and
a second coupling module having a first terminal coupled to the third terminal of the second transistor, and a second terminal coupled to the input of the electronic circuit.

3 more elements

Dependencies are inferred from the claim text.

Adaptive bias circuit and system thereof

Life of this patent

Adaptive bias circuit and system thereof

Life of this patent

Abstract

Claims25