Level shift circuit compensating for circuit element characteris

Details Level shift circuit compensating for circuit element characteris Level shift circuit compensating for circuit element characteris

1993-07-21

2000-04-18

Tokar, Michael J.

Electronic digital logic circuitry

Interface

Supply voltage level shifting

326117, H03K 190175

Patent

active

060519932

ABSTRACT:
A level shift circuit which drops the output voltage of a prior stage circuit to an input voltage level required at a next stage circuit includes a source follower enhancement-type FET, a gate of which is connected as an input terminal, a drain of which is connected to a positive power supply, and a source of which is connected to an anode of a level shift diode; a current adjusting enhancement-type FET, a drain of which is connected to a cathode of the level shift diode, a drain and a gate of which are connected to each other through a constant current source, and a source of which is connected to a negative power supply, an out-put terminal being taken from the connection node of the level shift diode and the constant current source; and a resistor connected between the constant current source and the negative power supply, the current adjusting enhancement-type FET having its gate-to-source voltage controlled by the current flowing through the resistor, thereby adjusting the current flowing through the source follower enhancement-type field effect transistor.

REFERENCES:
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patent: 4584492 (1986-04-01), Sharp
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patent: 4697110 (1987-09-01), Masuda et al.
patent: 4717836 (1988-01-01), Doyle
patent: 4926071 (1990-05-01), MacMillan et al.
patent: 4968904 (1990-11-01), Yamashita et al.
patent: 5177378 (1993-01-01), Nagasawa
patent: 5225718 (1993-07-01), Seshita et al.

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