公开(公告)号：US20240223142A1

公开(公告)日：2024-07-04

申请号：US18326136

申请日：2023-05-31

Applicant: MEDIATEK INC.

Inventor： Wan-Ling WU ,  Hung-Chieh TSAI

IPC: H03F3/45

CPC classification number: H03F3/45475 ,  H03F3/45273 ,  H03F2200/471

Abstract: A low-cost and high-accuracy threshold voltage (Vth) sensor is shown. In addition to a current mirror implemented by an operational amplifier and two metal-oxide-semiconductor field-effect transistors (MOSFETs), the Vth sensor uses an active device and a diode-connected MOSFET. The active device is provided to determine a constant current that is mirrored from the first MOSFET to the second MOSFET of the current mirror. The diode-connected MOSFET is coupled between the drain terminal of the second MOSFET and the ground terminal. The constant current flows through the diode-connected MOSFET to generate an output voltage that contains information about a threshold voltage (Vth) of a MOSFET.