Current mirror with low headroom requirement

Details Current mirror with low headroom requirement Current mirror with low headroom requirement

2007-01-09

2007-01-09

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

Reexamination Certificate

active

11108990

ABSTRACT:
A current mirror circuit includes a current input node for receiving an input current, an upper, cascoded current mirror, a lower current mirror, and a biasing means. In a FET implementation, the upper mirror includes first and second cascoded FETs which are connected together at the current input node, and third and fourth cascoded FETs connected to mirror the current conducted by the first and second FETs. The lower current mirror receives the mirrored current and mirrors it back to the upper mirror, thereby providing positive feedback. The net loop gain is between zero and one. When so arranged, the third and fourth FETs conduct a current which is proportional to an applied input current. The upper mirror transistors are biased such that the voltage at the current input node is substantially closer to the supply voltage than the voltages at the gates of the first and third FETs.

REFERENCES:
patent: 6529076 (2003-03-01), Escobar-Bowser
patent: 7113042 (2006-09-01), Richard et al.

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