Patent ID: 7663354
Filing Date: 2010-02-16
Classification: H02M,H03K

Abstract:
1. A voltage level shifting circuit comprising: a MOSFET which has either one of source/drain routes thereof connected to an input node to which an input voltage is supplied and has a predetermined voltage supplied to a gate thereof; and a current source which is provided between another source/drain route of the MOSFET and a ground potential of the circuit and allows a DC current component to flow therethrough, wherein the voltage level shifting circuit obtains an output voltage from another source/drain route of the MOSFET, wherein a capacitor is provided in parallel to the current source, wherein the capacitor is a MOS capacitor which is configured to have a sufficiently large capacitance value with respect to a drain-source parasitic capacitance of the MOSFET, wherein the current source is a depression type MOSFET which connects a gate and a source thereof to each other, wherein the output voltage is supplied to an input of a first CMOS inverter circuit which is operated with a power source voltage smaller than the input voltage, and wherein the predetermined voltage is the power source voltage.