High-linearity CMOS terahertz detector front-end circuit

Abstract

The invention discloses a high-linearity CMOS terahertz detector front-end circuit. The high-linearity CMOS terahertz detector front-end circuit comprises a bias circuit, a detection circuit, a current mirror circuit and a square root operation circuit; the bias circuit is used for providing bias voltage for a grid electrode of a detection circuit transistor; the detection circuit is used for detecting amplitude information of terahertz signals at the input end; the current mirror circuit is used for copying current information in a low-frequency detection signal and sending the copied currentinformation to the square root operation circuit; the square root operation circuit performs linearization processing on the copied low-frequency detection signal, and finally outputs an approximatesquare wave output signal with the same frequency as chopping modulation. The terahertz signals are directly detected through the detection transistor with the grid electrode connected with the antenna, linearization processing is conducted on the detection signal, and linear detection of the voltage amplitude of the terahertz signals at the room temperature is achieved for the first time.

Description

technical field [0001] The invention relates to terahertz wave detection technology, in particular to a high-linearity CMOS terahertz detector front-end circuit. Background technique [0002] Terahertz wave is an electromagnetic wave with a frequency ranging from 0.1THz to 10THz, its wavelength corresponds to 3 millimeters to 30 microns, and its spectrum is between millimeter waves and infrared light. The special position of terahertz signal in the electromagnetic spectrum makes it have many excellent characteristics, and it has broad application prospects in the fields of safety inspection, quality control, medical imaging, non-destructive detection and communication. Therefore, it is necessary to develop terahertz detector technology Do in-depth research. [0003] At present, terahertz detectors mainly include microbolometers, Schottky diodes, and quantum well terahertz detectors. However, microbolometers need to work at low temperatures, Schottky diodes are complex and ...

AI Technical Summary

Problems solved by technology

However, the detection output signals realized by traditional terahertz detectors all exhibit square-law characteristics and are not nonlinear output signals.

Therefore, traditional terahertz detector imaging has problems such as imaging blur and low resolution.

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