Level shift circuit and voltage controlled oscillation circuit u

Details Level shift circuit and voltage controlled oscillation circuit u Level shift circuit and voltage controlled oscillation circuit u

1997-05-19

1998-11-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327306, 327325, 327309, 326 68, H03K 17785

Patent

active

058349626

ABSTRACT:
A level shift circuit includes a plurality of diodes connected in tandem in a forward direction, a normally-ON transistor connected between a high-potential power line and a node of a highest potential side among the plurality of diodes connected in tandem, and a first pull-down circuit connected between a node of a lowest potential side among the plurality of diodes connected in tandem and a low-potential power line. The level shift circuit further includes a second pull-down circuit connected between a node among the plurality of diodes and the low-potential power line. An input voltage is applied to a control electrode of the normally-ON transistor, and an output voltage is taken from the node of the lowest potential side among the plurality of diodes. By the constitution, the magnitude of a level shift can remain constant relative to a wide range of input voltages. Eventually, a linear input/output characteristic can be obtained.

REFERENCES:
patent: 3748498 (1973-07-01), Hoffman
patent: 4450369 (1984-05-01), Schuermeyer
patent: 4728821 (1988-03-01), Yang et al.
patent: 4896061 (1990-01-01), Ahmed
patent: 5128556 (1992-07-01), Hirakata
patent: 5323071 (1994-06-01), Hirayama

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