Level shift circuit

Details Level shift circuit Level shift circuit

2010-05-25

2011-11-22

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

Reexamination Certificate

active

08063690

ABSTRACT:
The invention provides a level shift circuit that prevents an offset when the supply voltage changes. A level shift circuit has a differential amplification circuit, a current generation circuit, a capacitor and a holding circuit. An input signal from the optical pickup is inputted to the non-inversion input terminal of the differential amplification circuit. First, by turning on a first switch, a feedback loop is formed by the differential amplification circuit, the current generation circuit and the capacitor to perform a level shift, and the voltage charged in the capacitor is held by the holding circuit. Then by turning off the first switch and turning on a second switch, the voltage held by the holding circuit is applied to the non-inversion input terminal of the differential amplification circuit to perform a level shift.

REFERENCES:
patent: 5541907 (1996-07-01), Kurihara et al.
patent: 5726963 (1998-03-01), Ohta
patent: 6188060 (2001-02-01), Kim et al.
patent: 6437723 (2002-08-01), Otsuka et al.
patent: 6606286 (2003-08-01), Maekawa
patent: 6734639 (2004-05-01), Chang et al.
patent: 6-104751 (1994-04-01), None

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