Noise-insensitive device for bias current generation

Details Noise-insensitive device for bias current generation Noise-insensitive device for bias current generation

1995-01-18

1997-10-14

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323317, G05F 316

Patent

active

056776217

ABSTRACT:
A noise-insensitive device for generating a bias current includes a reference voltage source for supplying a reference voltage between a first reference terminal and a second reference terminal. A bias current generator generates the bias current in response to the reference voltage and includes a first and-a second input terminal coupled to the first and the second reference terminal via connecting wires which receive the reference voltage. A first and a second transistor arranged as a differential pair with the gate of the first transistor coupled to the first input terminal and the gate of the second transistor coupled to the second input terminal. The source of the first transistor and the source of the second transistor are coupled to one another at a common terminal for receiving a common current. Each of said transistors has a drain for supplying a first transistor current and a second transistor current, respectively, whose difference decreases when the common current increases. A converter is coupled to the first and the second transistor and has an output terminal for supplying a current which is proportional to the difference between the first transistor current and the second transistor current. A first current mirror has an input branch coupled to the output terminal of the converter. A second current mirror has an input branch coupled to an output branch of the first current mirror and an output branch coupled to the common terminal. The connecting wires do not carry current and interference as a result of cross-talk from other circuits coupled to the connecting wires is suppressed by the differential pair.

REFERENCES:
patent: 3982172 (1976-09-01), Van De Plassche
patent: 4890010 (1989-12-01), Neudeck et al.
patent: 4941080 (1990-07-01), Sieborger
patent: 4987379 (1991-01-01), Hughes
patent: 5132556 (1992-07-01), Cheng
patent: 5440277 (1995-08-01), Ewen et al.

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