Operational amplifier circuit
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United States of America Patent
Stats
-
Jan 23, 2018
Issued Date -
N/A
app pub date -
May 10, 2016
filing date -
Jun 18, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a folded cascode operational amplifier circuit, a source is connected to a back gate in each of third and fourth transistors that are cascode-connected to first and second transistors, which are an electric current source that returns an electric current signal output by a differential pair of an input stage. In the third and fourth transistors, an active parasitic element exists due to its device structure. When a falling edge signal of a rectangular wave is input, and electric current is supplied to the source of the third transistor to increase its electric potential, electric current flows into the drain from the back gate via the active parasitic element in an on state, in order to rapidly charge a capacitor. Thereby, a fifth transistor turns on within a shorter time, in order to improve an internal slew rate.
First Claim
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International Classification(s)
- 2016 Application Filing Year
- H03F Class
- 1076 Applications Filed
- 936 Patents Issued To-Date
- 86.99 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- H03F Class
- 0 % this patent is cited more than
- 7 Age
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