Constant electric current circuit

Abstract

Abstract PURPOSE: To obtain a constant current circuit which can obtain a constant current through no special process without being influenced by the fluctuations of an electric power voltage, by composing the constant current circuit of ordinary enhancement transistor elements and a resistance. CONSTITUTION: To electric power terminals 15 and 16 applied with positive and negative voltages P-type MOS transistor (TR)17, resistance 18 and N-type MOSTR 19 are connected in series and the gate of the TR19 is connected to the connection point between resistance 18 and the drain terminal of TR17. Further, P-type MOSTR20 and N-type MOSTR21 are connected in series between terminas 15 and 16 and the gate of TR20 is connected to the gate of TR17 in common to constitute a Miller circuit. Furthermore, load 22 and N-type TR23 are connected in series between terminals 15 and 16 and the connection point between resistance 18 and TR19 is connected to the gates of TR21, 23 to constitute another Miller circuit. The operation region of each TR is set to the tailing region of current-voltage characteristics and a region where a drain current increases with a gate voltage according to an exponential function is used to stabilize the operation. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Hiroaki Suzuki
• 👤 Michio Kurihara

Bibliographic Details