CR oscillation circuit

Details CR oscillation circuit CR oscillation circuit

2005-05-17

2005-05-17

Kinkead, Arnold (Department: 2817)

Oscillators

Phase shift type

C331S111000, C331S143000, C331S185000

Reexamination Certificate

active

06894574

ABSTRACT:
A CR oscillation circuit includes an oscillation unit having first through third invertion circuits connected in series between a first node and a second node, a capacitance element provided between the first node and an output terminal of the second inverting circuit, and a switch part for electrically connecting the first and second nodes according to a level of a control voltage; a constant current unit for allowing a constant current to flow according to a resistance value of an externally-provided resistive element to thereby supply a constant voltage; and a level conversion unit for converting a level of the constant voltage to thereby produce the control voltage.

REFERENCES:
patent: 5491456 (1996-02-01), Kay et al.

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