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US 7,348,825 B2Granted
Electric circuit
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHajime Kimura, Yasuko Watanabe
Life of this patent
Estimating the term…
Abstract
A transistor has variation in a threshold voltage or mobility due to accumulation of factors such as variation in a gate insulating film which is caused by a difference of a manufacturing process or a substrate to be used and variation in a crystal state of a channel formation region. The present invention provides an electric circuit which is arranged such that both electrodes of a capacitance device can hold a voltage between the gate and the source of a specific transistor. Further, the present invention provides an electric circuit which has a function capable of setting a potential difference between both electrodes of a capacitance device so as to be a threshold voltage of a specific transistor.
Claims49
An electric circuit comprising:
- an input terminal;
- an output terminal;
- a transistor comprising:
- a source electrode;
- a drain electrode;
- and
- a gate electrode;
- a first switch having first terminal and a second terminal;
- a second switch having a third terminal and a fourth terminal;
- a third switch having a fifth terminal and a sixth terminal;
- a fourth switch having a seventh terminal;
- and
- a capacitance device,
- wherein:
- the first terminal is electrically connected to the drain electrode,
- the second terminal is electrically connected to the gate electrode,
- the third terminal is electrically connected to the capacitance device,
- the fourth terminal is electrically connected to the source electrode,
- the fifth terminal is electrically connected to the source electrode,
- the sixth terminal is electrically connected to the output terminal,
- the seventh terminal is directly connected to the source electrode;
- and
- the capacitance device is electrically connected to the gate electrode.
20 more elements
An electric circuit comprising:
- first and second input terminals;
- an output terminal;
- a first transistor comprising:
- a first source electrode;
- a first drain electrode;
- and
- a first gate electrode;
- a second transistor comprising:
- a second source electrode;
- a second drain electrode;
- and
- a second gate electrode;
- a first switch having a first terminal and a second terminal;
- a second switch having a third terminal and a fourth terminal;
- a third switch having a fifth terminal and a sixth terminal;
- a fourth switch having a seventh terminal and a eighth terminal;
- and
- a fifth switch having a ninth terminal and a tenth terminal;
- a first capacitance device;
- and
- a second capacitance device,
- wherein;
- the first terminal is electrically connected to the first drain electrode,
- the second terminal is electrically connected to the first gate electrode,
- the third terminal is electrically connected to the first capacitance device,
- the fourth terminal is electrically connected to the first source electrode,
- the fifth terminal is electrically connected to the second drain electrode,
- the sixth terminal is electrically connected to the second gate electrode,
- the seventh terminal is electrically connected to the second capacitance device,
- the eighth terminal is electrically connected to the second source electrode,
- the ninth terminal is electrically connected to the first source electrode,
- the tenth terminal is electrically connected to the second drain electrode,
- the first capacitance device is electrically connected to the first gate electrode, and
- the second capacitance device is electrically connected to the second gate electrode.
31 more elements
An electric circuit comprising:
- first and second input terminals;
- an output terminal;
- a first capacitance device;
- a second capacitance device;
- a first transistor;
- a second transistor;
- a third transistor;
- a fourth transistor;
- a fifth transistor;
- a sixth transistor;
- and
- a seventh transistor;
- one of a source and a drain of the third transistor is electrically connected to one of a source and a drain of the first transistor,
- the other of the source and the drain of the third transistor is electrically connected to a gate of the first transistor,
- one of a source and a drain of the fourth transistor is electrically connected to the first capacitance device,
- the other of the source and the drain of the fourth transistor is electrically connected to the other of the source and the drain of the first transistor,
- one of a source and a drain of the fifth transistor is electrically connected to one of a source and a drain of the second transistor,
- the other of the source and the drain of the fifth transistor is electrically connected to a gate of the second transistor,
- one of a source and a drain of the sixth transistor is electrically connected to the second capacitance device,
- the other of the source and the drain of the sixth transistor is electrically connected to the other of the source and the drain of the second transistor,
- one of a source and a drain of the seventh transistor is electrically connected to the other of the source another drain of the first transistor,
- the other of the source and the drain of the seventh transistor is electrically connected to the one of the source and the drain of the second transistor,
- the first capacitance device is electrically connected to the gate of the first transistor, and
- the second capacitance device is electrically connected to the gate of the second transistor.
21 more elements
An electric circuit comprising:
- an input terminal;
- an output terminal;
- a first transistor;
- a second transistor;
- a third transistor;
- a fourth transistor;
- a fifth transistor;
- and
- a capacitance device;
- wherein:
- one of a source and a drain of the second transistor is electrically connected to one of a source and a drain of the first transistor,
- the other of the source and the drain of the second transistor is electrically connected to a gate of the first transistor,
- one of a source and a drain of the third transistor is electrically connected to the capacitance device,
- the other of the source and the drain of the third transistor is electrically connected to the other of the source and the drain of the first transistor,
- one of a source and a drain of the fourth transistor is electrically connected to the other of the source and the drain of the first transistor,
- the other of the source and the drain of the fourth transistor is electrically connected to the output terminal,
- one of a source and a drain of the fifth transistor is directly connected to the other of the source and the drain of the first transistor, and
- the capacitance device is electrically connected to the gate of the first transistor.
15 more elements
Dependencies are inferred from the claim text.