Back to results
US 5,969,549 AGranted
Current detection start-up circuit for reference voltage circuit
AssigneeLG Semicon Co., Ltd.
InventorsDae Jeong Kim, Youn-Cherl Shin
Life of this patent
Estimating the term…
Abstract
An improved current detection start-up circuit for a reference voltage circuit which restarts a reference voltage circuit when a reference voltage drops by a predetermined level, i.e., turns off, due to noise or a variation of a system voltage. The circuit includes: a current detection circuit for detecting the current being applied to a reference voltage circuit; and a start-up circuit for starting the reference voltage circuit when the current detected by the current detection circuit is below a predetermined level.
Claims9
A current detection start-up circuit for a reference voltage circuit, comprising:
- a current detection circuit for detecting a current being applied to said reference voltage circuit, said current detection circuit including
- a first transistor, together with a part of said reference voltage circuit, for forming a current mirror, a source of said first transistor being a system voltage,
- a second transistor of an opposite conductivity type then said first transistor, said first and second transistors being connected at gates thereof to a same voltage, respectively, and
- an inverter for inverting an output signal related to said first and second transistors;
- and
- a start-up circuit for restarting said reference voltage circuit when said current detected by said current detection circuit is below a predetermined level.
3 more elements
Dependencies are inferred from the claim text.