レベルシフト回路及び通信回路

Level shift circuit and communication circuit

Abstract

【課題】 入力信号の電圧振幅の最大値と同電圧を供給する電源電圧の入力を必要とせず、異なる電圧振幅の入力信号が入力された場合でも動作可能であり、貫通電流による消費電力の増大を低減できるレベルシフト回路及び通信回路を提供する。 【解決手段】 出力信号の電圧振幅の最大値と同電圧を供給する第1電圧源と内部出力ノードN1の間に設けられた負荷抵抗回路R1と、入力信号の入力電圧を受け付け、制御ノードN2の電圧値を入力信号の電圧振幅の最大値に対応する制御電圧値に保持する電圧記憶回路11と、内部出力ノードN1と入力信号の入力ノードN3の間に設けられ、制御ノードN2の電圧と入力信号の電圧の電圧差に応じてON状態とOFF状態が切り替わるように構成され、入力信号の電圧値が電圧振幅の最大値の場合にOFF状態に、入力信号の電圧値が電圧振幅の最小値の場合にON状態になる第1スイッチング回路MN1と、を備える。 【選択図】 図1
PROBLEM TO BE SOLVED: To provide a level shift circuit and a communication circuit that are operable even if an input signal with a different voltage amplitude is input without requiring input of power source voltage supplying the same voltage as the maximum value of the voltage amplitude of the input signal and that can reduce an increase in power consumption by a through current.SOLUTION: A level shift circuit comprises: a load resistance circuit R1 provided between a first voltage source supplying the same voltage as the maximum value of the voltage amplitude of an output signal and an internal output node N1; a voltage storage circuit 11 which receives the input voltage of an input signal and holds the voltage value of a control node N2 at a control voltage value corresponding to the maximum value of the voltage amplitude of an input signal; and a first switching circuit MN1 which is provided between the internal output node N1 and an input node N3 of the input signal, configured such that an OFF state and an ON state are switched according to a voltage difference between the voltage of the control node N2 and the voltage of the input signal, and which becomes the OFF state in the case that the voltage value of the input signal is the maximum value of the voltage amplitude, and becomes the ON state in the case that the voltage value of the input signal is the minimum value of the voltage amplitude.

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