Current-to-voltage converting apparatus and impedance...

Details Current-to-voltage converting apparatus and impedance... Current-to-voltage converting apparatus and impedance...

2006-02-28

2006-02-28

Shingleton, Michael B (Department: 2817)

Amplifiers

Signal feedback

Phase shift means in loop path

C330S002000, C324S601000, C324S650000

Reexamination Certificate

active

07005918

ABSTRACT:
A current-to-voltage converting apparatus connected to an element or a circuit having a first terminal connected to a signal source and comprising a feedback amplifier, which is connected to a second terminal of the element or the circuit and keeps the second terminal at virtual ground, and which converts the current signals that flow to the element or the circuit to voltage signals and outputs these signals; a device for opening the feedback loop of the feedback amplifier and measuring the open-loop loss of the feedback loop; and a compensating amplifier, which compensates for the open-loop loss. It further comprises a device for measuring the open-loop phase shift of the feedback loop when the feedback loop is open and a control unit for keeping the open-loop phase shift at a pre-determined value.

REFERENCES:
patent: 6054867 (2000-04-01), Wakamatsu
patent: 2002/0079959 (2002-06-01), Nair et al.
patent: 03-061863 (1991-03-01), None

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