Semiconductor device having oscillator circuit

摘要

An oscillation circuit section is provided which can attain the reduction of a consumed power amount and the reduction of a manufacturing cost. In a semiconductor device, voltages are generated to drive the oscillation circuit section by using a plurality of MOS transistors which are connected in serial and each of which is in a diode connection. At this time, each voltage is generated based on a power supply voltage and a ratio of the threshold voltages of the plurality of MOS transistors. Therefore, it is possible to suppress the threshold voltage of each MOS transistor, to save an area of each MOS transistor, and to reduce the consumed power amount of the oscillation circuit section.

主权项

1. A semiconductor device comprising:
a first power supply section configured to supply a first power supply voltage; a second power supply section configured to supply a second power supply voltage; an amplitude control circuit section configured to receive said first and second power supply voltages and generate first and second supply voltages; and an oscillation circuit section configured to receive said first and second supply voltages from first and second input sections to carry out an oscillation, wherein said amplitude control circuit section comprises: a plurality of MOS transistors, which are connected in serial between said first and second power supply sections, and each of which is in a diode connection; a first output section connected with one of said plurality of MOS transistors to output said first supply voltage; and a second output section connected with another of said plurality of MOS transistors to output said second supply voltage, wherein a back gate of at least one of said plurality of MOS transistors is connected with a source thereof.