Reference voltage circuit

Abstract

Abstract PURPOSE:To easily obtain an optional temperature coefficient and an optional output voltage by setting the 1st resistance and the 2nd resistance and adjusting the 3rd resistance, and obtaining a reference voltage from the 3rd resistance. CONSTITUTION:An operating current is flowed to a resistance R23 by transistors (TR) Q25 and Q26 constituting a current mirror circuit to cause a voltage drop V1. The base-emitter voltage of a Q21, on the other hand, is converted into a current by a Q23 and a resistance 22, and the current mirror circuit consisting of TRs Q27-Q28 flows a current to the resistance R23 to cause a voltage drop V2 with this curre. A reference voltage Vref=V1+V2 is developed across the resistance R23. This voltage has a positive and a negative temperature coefficient, so the resistance ratio is adjusted to obtain the reference voltage having a zero temperature coefficient or an optional temperature coefficient easily. The zero temperature coefficient is set only by the ratio of the resistances R21 and R22 and the resistance R23 is adjusted to obtain an optional reference voltage.

Inventors

• 👤 Shinji Tanaka
• 👤 慎二 田中

Bibliographic Details