Semiconductor device and analog/digital converter circuit including the semiconductor device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYoshiyuki KUROKAWA
Life of this patent
Estimating the term…
Abstract
To provide a semiconductor device with low power consumption. In transistors electrically connected to function as a comparator circuit, back gates are provided in the transistors functioning as current sources, and the transistors functioning as the current sources can be switched between conduction and non-conduction in accordance with a control signal supplied to the back gates. The control signal makes the transistor conductive in a period during which the comparator circuit operates and non-conductive in the other period. A semiconductor layer to be a channel formation region of the transistor included in the semiconductor device includes an oxide semiconductor.
Claims21
A semiconductor device comprising:
- a first transistor;
- a second transistor;
- a third transistor;
- a fourth transistor;
- a fifth transistor;
- and
- a sixth transistor,
- wherein a gate of the first transistor, a gate of the third transistor, a gate of the fifth transistor, a second terminal of the third transistor, and a first terminal of the fourth transistor are electrically connected to one another,
- wherein a second terminal of the first transistor, a first terminal of the second transistor, and a gate of the fourth transistor are electrically connected to one another,
- wherein a second terminal of the fifth transistor and a first terminal of the sixth transistor are electrically connected to one another, and
- wherein each of the first transistor, the third transistor, and the fifth transistor comprises a back gate.
The semiconductor device according to claim I, further comprising a seventh transistor and an eighth transistor,
- wherein a gate of the seventh transistor, a second terminal of the seventh transistor, and a first terminal of the eighth transistor are electrically connected to an output terminal,
- wherein the second terminal of the fifth transistor, the first terminal of the sixth transistor, and a gate of the eighth transistor are electrically connected to one another, and
- wherein the seventh transistor comprises a back gate.
A semiconductor device comprising:
- a first transistor;
- a second transistor;
- a third transistor;
- a fourth transistor;
- a fifth transistor;
- and
- a sixth transistor,
- wherein a gate of the first transistor, a gate of the third transistor, a gate of the fifth transistor, a second terminal of the third transistor, and a first terminal of the fourth transistor are electrically connected to one another,
- wherein a second terminal of the first transistor, a first terminal of the second transistor, and a gate of the fourth transistor are electrically connected to one another,
- wherein a second terminal of the fifth transistor and a first terminal of the sixth transistor are electrically connected to one another,
- wherein each of the first transistor, the third transistor, and the fifth transistor comprises a back gate,
- wherein a first signal is supplied to a gate of the second transistor,
- wherein a second signal is supplied to a gate of the sixth transistor,
- wherein a signal is output from the first terminal of the sixth transistor, and
- wherein the signal is determined by comparing the first signal and the second signal.
A semiconductor device comprising:
- a first transistor;
- a second transistor;
- a third transistor;
- a fourth transistor;
- a fifth transistor;
- and
- a sixth transistor,
- wherein a gate of the first transistor, a gate of the third transistor, a gate of the fifth transistor, a second terminal of the third transistor, and a first terminal of the fourth transistor are electrically connected to one another,
- wherein a second terminal of the first transistor, a first terminal of the second transistor, and a gate of the fourth transistor are electrically connected to one another,
- wherein a second terminal of the fifth transistor and a first terminal of the sixth transistor are electrically connected to one another,
- wherein each of the first transistor, the third transistor, and the fifth transistor comprises a back gate,
- wherein a first signal is supplied to a gate of the second transistor,
- wherein a second signal is supplied to a gate of the sixth transistor,
- wherein a signal is output from the first terminal of the sixth transistor,
- wherein the signal is determined by comparing the first signal and the second signal, and
- wherein a control signal is supplied to the back gate of each of the first transistor, the third transistor, and the fifth transistor to make the first transistor, the third transistor, and the fifth transistor conductive in a period during which the signal is output and make the first transistor, the third transistor, and the fifth transistor non-conductive in the other period.
Dependencies are inferred from the claim text.