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US 8,803,621 B2Granted
Semiconductor device having oscillator circuit
AssigneeRenesas Electronics Corporation
InventorSanae Suzuki
Life of this patent
Estimating the term…
Abstract
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.
Claims7
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.
8 more elements
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 OS transistors to output said second supply voltage,
- wherein said plurality of MOS transistors comprises:
- a first NMOS transistor connected with said first power supply section;
- a first PMOS transistor connected with said second power supply section;
- a second NMOS transistor connected between said first NMOS transistor and said first PMOS transistor, and connected with said first output section;
- and
- a second PMOS transistor connected between said first PMOS transistor and said second NMOS transistor and connected with said second output section,
- wherein a back gate of each of said first and second NMOS transistors is connected with said second power supply section,
- wherein a back gate of said first PMOS transistor is connected with said first power supply section, and
- wherein a back gate of said second PMOS transistor is connected with a source thereof.
16 more elements
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 said plurality of MOS transistors comprises:
- a first NMOS transistor connected with said first power supply section;
- a first PMOS transistor connected with said second power supply section;
- a second NMOS transistor connected between said first NMOS transistor and said first PMOS transistor and connected with said first output section;
- and
- a second PMOS transistor connected between said first PMOS transistor and said second NMOS transistor and connected with said second output section,
- wherein a back gate of each of said first and second PMOS transistors is connected with said first power supply section,
- wherein a back gate of said first NMOS transistor is connected with said second power supply section, and
- wherein a back gate of said second NMOS transistor is connected with a source thereof.
16 more elements
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 said amplitude control circuit section further comprises:
- a first switch circuit section configured to supply said first power supply voltage to said first input section until oscillation of said oscillation circuit section becomes stable, and supply said first supply voltage to said first input section while the oscillation is stable;
- and
- a second switch circuit section configured to supply said second power supply voltage to said second input section until the oscillation becomes stable, and supply said second supply voltage to said second input section while the oscillation is stable.
11 more elements
Dependencies are inferred from the claim text.