Voltage generation circuit which is capable of executing high-speed boost operation
According to one embodiment, a voltage generation circuit includes a first boost circuit, a voltage division circuit, a first detection circuit, a capacitor and a first switch. The first boost circuit outputs a first voltage. The voltage division circuit divides the first voltage. The first detection circuit is configured to detect a first monitor voltage supplied to the first input terminal, based on a reference voltage which is supplied to a second input terminal of the first detection circuit, and to control an operation of the first boost circuit. The capacitor is connected between an output terminal of the first boost circuit and the first input terminal of the first detection circuit. The first switch cuts off a connection between the capacitor and the first detection circuit, based on an output signal of the first detection circuit, until the first voltage is output from the first boost circuit.
1. A voltage generation circuit comprising:
a charge pump circuit configured to output a first voltage;
a first voltage division circuit configured to divide the first voltage to a second voltage;
a second voltage division circuit configured to divide a difference between the first voltage and the second voltage to a third voltage
a first amplifier having a first input terminal and a second input terminal, the first amplifier configured to input the second voltage from the first input terminal and to input a fourth voltage from the second input terminal, the first amplifier configured to output a signal which controls the charge pump circuit;
a second amplifier having a third input terminal and a fourth input terminal, the second amplifier configured to input the third voltage from the third input terminal and to input the fourth voltage from the fourth input terminal, the second amplifier configured to output a signal which controls a part of the voltage generation circuit;
a capacitor having a first end connected to an output terminal of the charge pump circuit and a second end connected to the first input terminal of the first amplifier via a first transistor.
2. The voltage generation circuit according to claim 1 , wherein
the part of the voltage generation circuit is the first transistor.
3. The voltage generation circuit according to claim 1 , wherein
the first transistor is connected between the second end of the capacitor and the first input terminal of the first amplifier.
4. The voltage generation circuit according to claim 1 , further comprising:
a second transistor, a first end of the second transistor connected to the second end of the capacitor and a second end of the second transistor connected to a node supplied with the fourth voltage.
5. The voltage generation circuit according to claim 4 , further comprising:
a logical circuit, an input terminal of the logical circuit connected to an output terminal of the second amplifier and a second output terminal of the logical circuit connected to a gate of the second transistor.
6. The voltage generation circuit according to claim 5 , wherein
the second transistor is configured to establish a connection between the capacitor and a node supplied with the fourth voltage, based on an output signal from the second output terminal of the logical circuit, until the first voltage is output from the charge pump circuit.
7. The voltage generation circuit according to claim 1 , wherein the first voltage division circuit and the second voltage division circuit includes:
a first resistance, a first end of the first resistance connected to the output terminal of the charge pump circuit and a second end of the first resistance connected to the third input terminal of the second amplifier;
a second resistance, a first end of the second resistance connected to the second end of the first resistance and a second end of the second resistance connected to the first input terminal of the first amplifier; and
a third resistance, a first end of the third resistance connected to the second end of the second resistance and a second end of the third resistance connected to the ground terminal.
8. The voltage generation circuit according to claim 1 , further comprising:
a logical circuit, an input terminal of the logical circuit connected to an output terminal of the second amplifier and a first output terminal of the logical circuit connected to a gate of the first transistor.
9. The voltage generation circuit according to claim 8 , wherein
the first transistor is configured to cut off a connection between the capacitor and the first amplifier, based on an output signal from the first output terminal of the logical circuit, until the first voltage is output from the charge pump circuit.