Patent ID: 8779850
Filing Date: 2014-07-15
Classification: H03K

Abstract:
1. A bootstrap circuit having an input terminal, an inverting input terminal, an output terminal and an inverting output terminal, the bootstrap circuit comprising: a first sub-bootstrap circuit, comprising a first inverter, a first bootstrap capacitor, a first charging path, a first discharging path, and a first high voltage providing path, wherein an input terminal of the first inverter is electrically connected with the input terminal of the bootstrap circuit, an output terminal of the first inverter is electrically connected with a first end of the first bootstrap capacitor, the first charging path is electrically connected between a second end of the first bootstrap capacitor and a power voltage, the first high voltage providing path is electrically connected between the second end of the first bootstrap capacitor and the output terminal of the bootstrap circuit, and the first discharging path is electrically connected between the output terminal of the bootstrap circuit and a ground terminal, wherein the first discharging path and the first high voltage providing path are controlled according to a voltage at the input terminal of the bootstrap circuit, and the first charging path is controlled according to a voltage at the output terminal of the bootstrap circuit; a second sub-bootstrap circuit, comprising a second inverter, a second bootstrap capacitor, a second charging path, a second discharging path, and a second high voltage providing path, wherein an input terminal of the second inverter is electrically connected with the inverting input terminal of the bootstrap circuit, an output terminal of the second inverter is electrically connected with a first end of the second bootstrap capacitor, the second charging path is electrically connected between a second end of the second bootstrap capacitor and the power voltage, the second high voltage providing path is electrically connected between the second end of the second bootstrap capacitor and the inverting output terminal of the bootstrap circuit, and the second discharging path is electrically connected between the inverting output terminal of the bootstrap circuit and the ground terminal, wherein the second discharging path and the second high voltage providing path are controlled according to a voltage at the inverting input terminal of the bootstrap circuit, and the second charging path is controlled according to a voltage at the inverting output terminal of the bootstrap circuit; and a charging path providing circuit, comprising a third charging path, wherein the third charging path is electrically connected between the power voltage and the second end of the first bootstrap capacitor, and the third charging path is controlled according to the voltage at the inverting output terminal of the bootstrap circuit, wherein in response to a high voltage level inputted into the input terminal of the bootstrap circuit, the first charging path and the third charging path are turned on, the first bootstrap capacitor is charged to a capacitor voltage, the first discharging path is turned on to discharge the output terminal of the bootstrap circuit, and the first high voltage providing path is turned off, and in response to a low voltage level inputted into the input terminal of the bootstrap circuit, the first charging path and the third charging path and the first discharging path are turned off, the first high voltage providing path is turned on, and a first superimposed voltage including the high voltage level and the capacitor voltage is provided to the output terminal of the bootstrap circuit.