Patent ID: 11923368
Assignee: KEY FOUNDRY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A semiconductor device, comprising:
junction-gate field-effect transistors (JFETs) each having a pinch-off voltage, each of the JFETs comprising:
a top gate region disposed on a surface of a substrate;
a channel region surrounding the first top gate region; and
a bottom gate region disposed under the channel region,

wherein the channel region and the bottom gate region have different conductivity types from each other,
the bottom gate region of one of the JFETs has depth which is greater than a depth of the bottom gate region of another of the JFETs, and
the first pinch-off voltage of the one of the JFETs is higher than the pinch-off voltage of the other of the JFETs
wherein each of the JFETs further comprise a device isolation film disposed in contact with the channel region,
the bottom gate region and first device isolation film of the other of the JFETs are disposed in contact with each other, and
the bottom gate region and the device isolation film of the one of the JFETs are disposed spaced apart from each other.