Low noise level shifting circuits and methods and systems...

Details Low noise level shifting circuits and methods and systems... Low noise level shifting circuits and methods and systems...

2005-09-20

2005-09-20

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C327S333000

Reexamination Certificate

active

06946890

ABSTRACT:
A driver circuit includes an operational amplifier having an input and an output coupled by a feedback element. A voltage level shifter generates a voltage drop from the operational amplifier output to the operational amplifier input with a current source transistor setting a current controlling the voltage drop across the feedback element. A chopper circuit shifts flicker noise generated by the current source transistor to a higher frequency spectrum.

REFERENCES:
patent: 4065726 (1977-12-01), Senger
patent: 2003/0099346 (2003-05-01), Joffe et al.

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