Intermediate potential generating circuit

Abstract

Abstract PURPOSE:To generate a stable intermediate potential in spite of fluctuation in a power source, by generating two kinds of intermediate potentials with a first and a second Trs and a constant voltage device, and supplying them to the gates of a third and a fourth Trs having large current driving capability. CONSTITUTION:By setting the channel width of the Trs Q05 and Q06 larger than those of Trs Q01-Q04, large current driving capability can be attached on the Trs Q05 and Q06. Assuming the threshold voltage of the Q02 as Vtn2, that of the Q03 as Vtp3, that of the Q05 as Vtn5, and that of the Q06 as Vtp6, relation (Vtn2+¦Vtp3¦<Vtn5+¦Vtp6¦) is set. Then, since the Trs Q05 at the Q06 are never turned ON simultaneously, it is possible to prevent a through current that flows from a power source VDD to the earth power source VSS from being generated. Since the potential of a connection point n2 can be maintained almost at the threshold voltage Vtn4 of the Tr Q04 even when the power source VDD fluctuates, a stable output potential Vout can be obtained even when the power source VDD fluctuates.

Inventors

• 👤 Kazuhiro Sawada
• 👤 沢田　和宏
• 👤 Takayasu Sakurai
• 👤 貴康 桜井

Bibliographic Details