Direct current correction circuit for charge transfer element

Abstract

Abstract PURPOSE: To eliminate the DC potential variation due to base current with a simple constitution, by connecting the current source corresponding to the base current up to the prestage between the stages of charge transfer elements consisting of bipolar transistors. CONSTITUTION: The hot end of the capacitor C o is connected to the base of npn- type transistor Q 1 ', the collector of this transistor is to the power supply terminal 4 and the emitter is connected to the base of npn-type transistor Q 1 ". Next, the collector of transistor Q 1 " is connected to the power supply terminal 4 and the resistor R 1 ' is connected between the base and emitter, and the emitter is grounded via the resistor R 1 ". Further, the hot end of the capacitors C 2 , C 4 ...C 2n is similarly constituted. In this circuitry, when the value of R is selected so that the base current of transistors Q 1 , Q 1 ' is equal each other, the base current of transistor Q 1 is cancelled resulting in eliminating the DC voltage variation due to the base current with a simple constitution. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Takahisa Tsuchiya
• 👤 Mitsuo Soneda

Bibliographic Details