Patent ID: 8779830
Filing Date: 2014-07-15
Classification: H03K

Abstract:
1. An inverse level shift circuit that converts a high-side input signal to a low-side output signal, comprising: a first pulse circuit outputting a first pulse signal on a rise of the input signal; a second pulse circuit outputting a second pulse signal on a fall of the input signal; first and second drive circuits generating first and second drive signals from the first and second pulse signals using a high-side reference potential as a reference potential; first and second transistors driven by the first and second drive signals respectively; a voltage conversion mask signal generation circuit generating a first main signal and a first mask signal by converting an output signal of the first transistor to a low-side voltage, and generating a second main signal and a second mask signal by converting an output signal of the second transistor to a low-side voltage; a mask signal generation circuit generating a third mask signal with higher sensitivity than the first and second mask signals with respect to a fluctuation in the high-side reference potential; a mask logical circuit generating a fourth mask signal by performing a AND operation between the first mask signal and the second mask signal, and masking the first and second main signals with the third and fourth mask signals; and a SR flip flop circuit generating the output signal from the masked first and second main signals.