Driver circuit of Schottky transistor
A driver circuit includes an output terminal connected to a gate of a Schottky transistor, a reference transistor formed in the same manner as the Schottky transistor, a resistor connected between a first power source line and a gate of the reference transistor, a voltage generator configured to supply a second node with a voltage equal to or lower than a voltage at a first node between the resistor and the reference transistor, and a switching element configured to transmit the voltage at the second node to the output terminal in response to a signal inputted to an input terminal.
1. A driver circuit of a Schottky transistor comprising:
an input terminal configured to receive an inputted signal;
an output terminal connected to a gate of the Schottky transistor;
a first power source line;
a second power source line having lower potential than the first power source line;
a reference transistor formed in a same manner as the Schottky transistor, at least one of a source and a drain of the reference transistor being connected to the second power source line;
a resistor connected between the first power source line and a gate of the reference transistor;
a voltage generator connected to a first node between the resistor and the gate of the reference transistor and configured to supply a second node with a voltage being equal to or lower than a voltage at the first node; and
a switching element configured to transmit the voltage at the second node to the output terminal in response to the signal inputted to the input terminal, wherein
the voltage generator is made of a MOS transistor,
a source of the MOS transistor is connected to the first power source line,
a drain of the MOS transistor is connected to the second node, and
a gate of the MOS transistor is connected to the first node.
2. A driver circuit of a Schottky comprising:
an input terminal configured to receive an inputted signal;
an output terminal connected to a gate of the Schottky transistor;
a first power source line;
a second power source line having lower potential than the first power source line;
a plurality of reference transistors placed away from one another on one semiconductor chip and formed in a same manner as the Schottky transistor, at least one of a source and a drain of the reference transistors being connected to the second power source line;
a resistor connected between the first power source line and a gate of the reference transistors;
a voltage generator connected to a first node between the resistor and the gate of the reference transistor and configured to supply a second node with a voltage being equal to or lower than a voltage at the first node; and
a switching element configured to transmit the voltage at the second node to the output terminal in response to the signal inputted to the input terminal.
3. A driver circuit of a Schottky transistor comprising:
an input terminal configured to receive an inputted signal;
an output terminal connected to a gate of the Schottky transistor;
a first power source line;
a second power source line having lower potential than the first power source line;
a reference transistor formed in a same manner as the Schottky transistor, at least one of a source and a drain of the reference transistor being connected to the second power source line;
a resistor connected between the first power source line and a gate of the reference transistor;
a voltage generator connected to a first node between the resistor and the gate of the reference transistor and configured to supply a second node with a voltage being equal to or lower than a voltage at the first node; and
a switching element configured to transmit the voltage at the second node to the output terminal in response to the signal inputted to the input terminal, wherein a resistance value R G of the resistor is set to a value equal to or greater than a value obtained by a formula R G =(V G1 −V G2 )/I G , where V G1 is a voltage on the first power source line, V G2 is a breakdown voltage of the reference transistor, and I G is a current flowing into the gate of the reference transistor via the resistor upon occurrence of a breakdown.