Patent ID: 6831498
Filing Date: 2004-12-14
Classification: H03K

Abstract:
An electronic circuit having very fast switching of an output current between a high level of current and a low level of current comprised of:a reference current source; a reference potential voltage; first and second gate potential voltages; a logic signal source switching between two output voltages whereby said output current is switched between said high level and said low level; a first plurality of transistors all of the same polarity, a first transistor having its gate and drain connected to said current source and having its source connected to the drains of a second and a third transistor, said second transistor having its drain connected to the source of said first transistor, its gate connected to said first gate potential voltage sufficient to having said second transistor operate in its triode region and its source connected to said reference potential; and said third transistor having its drain connected to the source of said first transistor, its gate connected to said second gate potential voltage sufficient to having said third transistor operate in its triode region, its source connected to said reference potential, and said third transistor having a resistance substantially higher than said second transistor; a second plurality of transistors all of the same polarity as the polarity of said first plurality, a first transistor having its gate connected to said current source, having its drain supplying said output current, and having its source connected to the drains of a second and a third transistor, said second transistor having its drain connected to the source of said first transistor, its gate connected to a said logic signal source, and its source connected to said reference potential; and said third transistor having its drain connected to the source of said first transistor, its gate connected to said second gate potential voltage, its source connected to said reference potential, and having a resistance substantially higher than said second transistor; said logic signal source that switches between two states having an output voltage sufficient in one state to switch said second transistor off whereby said output current is at said low level set by said third transistor, and in the other state having the same value as said first gate potential whereby said output current is at said high level.