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US 5,689,197 AGranted
BIMOS-type current switch apparatus
AssigneeNEC Corporation
InventorMitsutoshi Sugawara
Life of this patent
Estimating the term…
Abstract
A current switch apparatus includes a bipolar transistor controlled by a reference voltage, a MOS transistor controlled by a logic signal, and a constant current source connected to the bipolar transistor and the MOS transistor.
Claims33
A current switch apparatus comprising:
- a logic signal input terminal;
- an output terminal;
- a power supply terminal;
- a reference voltage terminal;
- a bipolar transistor having a collector connected to said output terminal, a base connected to said reference voltage terminal, and an emitter;
- a MOS transistor, connected between said power supply voltage terminal and the emitter of said bipolar transistor and having a gate connected to said logic signal input terminal;
- and
- a constant current source connected to the emitter of said bipolar transistor,
- wherein said MOS transistor is of an N-channel type.
6 more elements
A current switch apparatus comprising:
- a logic signal input terminal;
- an output terminal;
- a power supply terminal;
- a reference voltage terminal;
- a bipolar transistor having a collector connected to said power supply terminal, a base connected to said reference voltage terminal, and an emitter;
- a MOS transistor, connected between said output terminal and the emitter of said bipolar transistor and having a gate connected to said logic signal input terminal;
- and
- a constant current source connected to the emitter of said bipolar transistor,
- wherein said MOS transistor is of an N-channel type.
6 more elements
A current switch apparatus comprising:
- a plurality of logic signal input terminals;
- an output terminal;
- a power supply terminal;
- a reference voltage terminal;
- a plurality of bipolar transistors, each having a collector connected to said output terminal, a base connected to said reference voltage terminal, and an emitter;
- a plurality of MOS transistors, each being connected between said power supply terminal and the emitter of one of said bipolar transistors and having a gate connected to one of said logic signal input terminals;
- and
- a plurality of constant current sources each connected to the emitter of one of said bipolar transistors.
5 more elements
A current switch apparatus comprising:
- a plurality of logic signal input terminals;
- an output terminal;
- a power supply terminal;
- a reference voltage terminal;
- a plurality of bipolar transistors, each having a collector connected to said power supply terminal, a base connected to said reference voltage terminal, and an emitter;
- a plurality of MOS transistors, each being connected between said output terminal and the emitter of one of said bipolar transistors and having a gate connected to one of said logic signal input terminals;
- and
- a plurality of constant current sources each connected to the emitter of one of said bipolar transistors.
5 more elements
A current switch apparatus comprising:
- a plurality of logic signal input terminals;
- an output terminal;
- a power supply voltage terminal;
- a reference voltage terminal;
- a bipolar transistor having a collector connected to said output terminal, a base connected to said reference voltage terminal, and an emitter;
- a plurality of MOS transistors, being connected between said power supply terminal and the emitter of said bipolar transistor and having a gate connected to one of said logic signal input terminals;
- and
- a constant current source connected to the emitter of said bipolar transistor.
5 more elements
A current switch apparatus comprising:
- a plurality of logic signal input terminals;
- an output terminal;
- a power supply voltage terminal;
- a reference voltage terminal;
- a bipolar transistor having a collector connected to said output terminal, a base connected to said reference voltage terminal, and an emitter;
- a plurality of MOS transistors, being connected between said output terminal and the emitter of said bipolar transistor and having a gate connected to one of said logic signal input terminals;
- and
- a constant current source connected to the emitter of said bipolar transistor.
5 more elements
A current switch apparatus comprising:
- plurality of logic signal input terminals;
- an output terminal
- a power supply terminal;
- a reference voltage terminal;
- a column of bipolar transistors, having collectors connected to said output terminal bases connected to said reference voltage terminal and emitters;
- a column of constant current sources each connected to one of the emitters of said bipolar transistors;
- a plurality of first conductive line each connected to one of said constant current sources;
- and
- a plurality of rows of MOS transistors, each row of said MOS transistors being connected between said power supply terminal and one of said conductive line, gates of each column of said MOS transistors being connected to one of said logic signal terminals.
6 more elements
Dependencies are inferred from the claim text.