Patent ID: 6051988
Filing Date: 2000-04-18
Classification: H03K

Abstract:
A pulse width controlling logic circuit comprising:a pulse width controlling unit;an integrating circuit for integrating an input signal supplied thereto;an average level detecting unit for detecting an average level of the input pulse signal supplied thereto; andan average level converting unit,whereinsaid pulse width controlling unit is provided with a logic element having an input threshold level that depends on a power supply voltage applied to the logic element,said average level converting unit is supplied with an output signal from said average level detecting circuit and converts the output signal into a control signal,the control signal from said average level converting unit is applied to said pulse width controlling unit so as to control the power supply voltage applied to the logic element in accordance with a level of the output signal from said average level detecting unit, andthe logic element converts an output signal from said integrating circuit into a pulse signal having a pulse width commensurate with the power supply voltage controlled by said pulse width controlling unit.