Patent ID: 8957721
Filing Date: 2015-02-17
Classification: H03K

Abstract:
1. A level shift circuit that outputs an output signal obtained by shifting a signal level of an input signal, the level shift circuit comprising: a first current control element that uses the input signal or a signal having a phase same as a phase of the input signal as a first gate input, and controls an amount of current flowing through an output terminal depending on a voltage level of the first gate input; a second current control element that uses a signal having a phase opposite to the phase of the input signal as a second gate input, and controls an amount of current flowing through an output terminal depending on a voltage level of the second gate input; a first resistance element having one end connected to a shift level power terminal that supplies an output voltage of the output signal on a high level, and having the other end connected to the output terminal of the first current control element; a second resistance element having one end connected to the shift level power terminal, and having the other end connected to the output terminal of the second current control element; a comparator including a pair of differential input terminals, one of which being connected to the output terminal of the first current control element, and the other of which being connected to the output terminal of the second current control element, the comparator generating the output signal by amplifying a voltage difference between the pair of the differential input terminals; and a current control circuit that controls an amount of first current flowing through the first current control element via the first resistance element and an amount of second current flowing through the second current control element via the second resistance element in synchronization with a rising and a falling of a signal level of the input signal.