Back to results
US 2010/0244909 A1Published application
Low-speed driver circuit
AssigneeFujitsu Microelectronics Limited
InventorHiromitsu OOSAWA
Life of this patent
Estimating the term…
Abstract
A driver circuit includes an output transistor circuit that includes a first transistor of a first conductivity type and a second transistor of a second conductivity type disposed between a supply voltage source and a reference voltage source, and that outputs an output signal from a connection node between the first transistor and the second transistor, a first pre-buffer circuit that drives a gate of the first transistor in response to an input signal, and a second pre-buffer circuit that drives a gate of the second transistor in response to the input signal.
Claims18
A driver circuit comprising:
- an output transistor circuit that includes a first transistor of a first conductivity type and a second transistor of a second conductivity type disposed between a supply voltage source configured to supply a supply voltage and a reference voltage source configured to supply a reference voltage, wherein the output transistor circuit is configured to output an output signal from a connection node between the first transistor and the second transistor;
- a first pre-buffer circuit configured to drive a gate of the first transistor in response to an input signal;
- and
- a second pre-buffer circuit configured to drive a gate of the second transistor in response to the input signal,
- wherein the first pre-buffer circuit includes:
- a third transistor of the first conductivity type and a fourth transistor of the second conductivity type, the third and fourth transistors being configured to receive the input signal and drive the gate of the first transistor;
- a first current source disposed between the fourth transistor and the reference voltage source;
- and
- a fifth transistor of the first conductivity type is diode-coupled between the supply voltage source and the third transistor, and
- wherein the second pre-buffer circuit includes:
- a sixth transistor of the first conductivity type and a seventh transistor of the second conductivity type, the sixth and seventh transistors being configured to receive the input signal and drive the gate of the second transistor;
- a second current source disposed between the sixth transistor and the supply voltage source;
- and
- an eighth transistor of the second conductivity type is diode-coupled between the reference voltage source and the seventh transistor.
11 more elements
A driver circuit comprising:
- an output transistor circuit that includes a first transistor of a first conductivity type and a second transistor of a second conductivity type disposed between a supply voltage source configured to supply a supply voltage and a reference voltage source configured to supply a reference voltage, the output transistor circuit being configured to output an output signal from a connection point between the first transistor and the second transistor;
- a first pre-buffer circuit configured to drive a gate of the first transistor in response to an input signal;
- a second pre-buffer circuit configured to drive a gate of the second transistor in response to the input signal;
- a first diode-coupled transistor of the first conductivity type disposed on a supply voltage source side in the first pre-buffer circuit;
- and
- a second diode-coupled transistor of the second conductivity type disposed on a reference voltage source side in the second pre-buffer circuit,
- wherein channels and sources of the first transistor and the first diode-coupled transistor are coupled to the supply voltage source, and
- wherein channels and sources of the second transistor and the second diode-coupled transistor are coupled to the reference voltage source.
5 more elements
A driver circuit comprising:
- an output transistor of a second conductivity type disposed between an output terminal and a reference voltage source configured to supply a reference voltage;
- and
- a pre-buffer circuit that drives a gate of the output transistor in response to an input signal,
- wherein the pre-buffer circuit includes:
- a first transistor of a first conductivity type and a second transistor of the second conductivity type configured to receive the input signal and drive the gate of the output transistor;
- a current source disposed between the first transistor and a supply voltage source;
- and
- a third transistor of the second conductivity type diode-coupled between the reference voltage source and the second transistor.
5 more elements
Dependencies are inferred from the claim text.