BiCMOS logic circuit with additional drive to the pull-down bipolar output transistor
AssigneeKabushiki Kaisha Toshiba
InventorsFujio Masuoka, Kiyofumi Ochii
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Abstract
A logic circuit comprises at least one signal input terminal, an output terminal, an output circuit including a first bipolar transistor coupled between the output terminal and a reference potential terminal, to discharge the output terminal, and an MOS type logic circuit for supplying to the base of the first bipolar transistor a signal of a level corresponding to an input signal supplied to the at least one signal input terminal. The logic circuit further comprises a control MOS transistor coupled between a power source terminal and the base of the bipolar transistor, for supplying part of the base current to the bipolar transistor in response to a signal at the output terminal.
Claims18
A logic circuit comprising:
- at least one signal input terminal;
- an output terminal;
- output circuit means including a first bipolar transistor coupled between the output terminal and a reference potential terminal, to discharge said output terminal;
- MOS logic circuit means for supplying to the base of said first bipolar transistor a signal of a level corresponding to an input signal supplied to said at least one signal input terminal;
- and
- a control MOS transistor coupled between a power source terminal and the base of said bipolar transistor, and for supplying part of base current to the bipolar transistor in response to the signal at said output terminal.
Dependencies are inferred from the claim text.