Circuit and method for providing a reference circuit that is sub

Details Circuit and method for providing a reference circuit that is sub Circuit and method for providing a reference circuit that is sub

1995-11-22

1998-04-14

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

327538, G05F 326

Patent

active

057396825

ABSTRACT:
A current source (10) for use on an integrated circuit chip (14), particularly in conjunction with CMOS circuits or the like, includes a first MOS transistor (12), having a gate to control a current in a current flow path therethrough. A second MOS transistor (13) having a gate to control a current in a current flow path therethrough between a supply voltage and a reference potential is connected to the gate of the first MOS transistor (12). A current source (16) is connected at a connection node to the first MOS transistor (12) to supply a current in the current flow path of the first MOS transistor (12) to hold the first MOS transistor (12) on. The gate of the first MOS transistor (12) is connected to the connection node. A bias voltage source (V.sub.B) is provided in the current flow path of the first MOS transistor (12) with respect to the reference potential. With the circuit thus configured, the current flowing through the second MOS transistor (13) is essentially independent of the threshold voltage of the second MOS transistor (13). The MOS transistors can be either NMOS or PMOS transistors.

REFERENCES:
patent: 4399374 (1983-08-01), Boeke
patent: 4642552 (1987-02-01), Suzuki et al.

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