Bi-CMOS voltage level conversion circuit
AssigneeKabushiki Kaisha Toshiba
InventorsKazunori Tsugaru, Yasuhiro Sugimoto
Life of this patent
Estimating the term…
Abstract
In the output circuit a signal from an internal circuit is supplied to the gate of an N-channel type MOS transistor, a node of two resistors connected in series across a power supply terminal and ground is connected to one end of the MOS transistor. An NPN transistor is connected at its base to the node, at its collector to the power supply terminal and at its emitter to an output terminal. The positive polarity terminal of a power supply is connected to the power supply terminal to supply a positive voltage V.sub.CC and the negative polarity terminal of another power supply is connected through a load resistor to the output terminal to supply a negative voltage.
Claims7
A voltage output circuit responsive to an input signal and connected between a positive power supply and a negative power supply, comprising:
- a circuit output terminal;
- means for connecting said circuit output terminal to said negative power supply;
- a metal oxide semiconductor (MOS) transistor having a gate for receiving said input signal and a drain-source path, said drain-source path having a source end and a drain end, said drain end being connected to ground and having a current flow determined by said input signal;
- a bias circuit connected between said positive power supply and ground, and having a bias output terminal connected to said source end of said drain-source path of said MOS transistor, said bias circuit having a bias voltage at said bias output terminal set in accordance with said current flow of said MOS transistor;
- and
- means, including a first bipolar transistor having a collector, a base and an emitter, with said collector connected to said positive power supply, said base connected to said bias output terminal and said emitter connected to said circuit output terminal, for providing a circuit output voltage at said circuit output terminal in accordance with said bias voltage set by said bias circuit.
Dependencies are inferred from the claim text.