Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-10-19
2000-05-02
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327538, 327540, 323313, 323315, G05F 110
Patent
active
060577274
ABSTRACT:
The present invention relates to a constant current generator including a reference voltage source providing a constant voltage with respect to a first ground; an operational amplifier receiving the constant voltage on a non-inverting input; and a follower transistor controlled by the output of the operational amplifier and connected between an input of a current mirror and a first resistor connected to the first ground. It further includes a second resistor connected between an output of the current mirror and a second ground, the output of the current mirror being also coupled to an inverting input of the operational amplifier; and a filtering circuit connected to reduce or eliminate, in the output signal of the operational amplifier, any high frequency ac component with respect to the first ground.
REFERENCES:
patent: 4626702 (1986-12-01), Chito
patent: 5359552 (1994-10-01), Dhong et al.
patent: 5642072 (1997-06-01), Miyamoto et al.
patent: 5680348 (1997-10-01), Chung et al.
patent: 5774013 (1998-06-01), Groe
French Search Report for application No. 9713318, filed Oct. 20, 1997.
Current Sources and Sinks, Electronics World and Wireless World, vol. 96, No. 1658, Dec. 1, 1990 p. 1064 XP000174982.
Dautriche Pierre
Rouzier Thierry
Callahan Timothy P.
Galanthay Theodore E.
Luu An T.
Morris James H.
STMicroelectronics S.A.
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