Patent ID: 11875837
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 2:
3. A semiconductor device, comprising:
a first circuit, a second circuit, a first cell, a second cell, a first wiring, and a second wiring,
wherein the first cell comprises a first transistor, a third transistor, and a first capacitor,
wherein the second cell comprises a second transistor, a fourth transistor, and a second capacitor,
wherein the first circuit is electrically connected to the first wiring,
wherein the second circuit is electrically connected to the second wiring,
wherein a first terminal of the third transistor is electrically connected to a first terminal of the first transistor and the first wiring,
wherein a second terminal of the third transistor is electrically connected to a gate of the first transistor and a first terminal of the first capacitor,
wherein a second terminal of the first capacitor is electrically connected to the second wiring,
wherein a first terminal of the fourth transistor is electrically connected to a first terminal of the second transistor and the second wiring,
wherein a second terminal of the fourth transistor is electrically connected to a gate of the second transistor and a first terminal of the second capacitor,
wherein a second terminal of the second capacitor is electrically connected to the second wiring,
wherein the first circuit has a function of making a first current flow from the first circuit to the first terminal of the first transistor through the first wiring,
wherein the second circuit has a function of making a second current flow from the second circuit to the first terminal of the second transistor through the second wiring and a function of supplying a first potential corresponding to the second current from the second circuit to each of the second terminal of the first capacitor and the second terminal of the second capacitor through the second wiring,
wherein the first cell has a function of setting the first current flowing between the first terminal and a second terminal of the first transistor,
wherein the second cell has a function of setting the second current flowing between the first terminal and a second terminal of the second transistor,
wherein the second circuit has a function of changing the second current flowing in the second wiring to a third current to change the first potential supplied to each of the second terminal of the first capacitor and the second terminal of the second capacitor to a second potential,
wherein the first cell has a function of changing the first current flowing between the first terminal and the second terminal of the first transistor to a fourth current corresponding to a difference between the first potential and the second potential,
wherein an amount of each of the first current and the fourth current is an amount of current flowing when the first transistor operates in a subthreshold region, and
wherein an amount of each of the second current and the third current is an amount of current flowing when the second transistor operates in a subthreshold region.