Wideband single pixel radiometer in CMOS

Abstract

The design and performance analysis are presented for a passive uncooled radiometer pixel suitable for integration in 28nm CMOS technology. In the configuration a single wideband antenna, operating from 200 GHz to 600 GHz, is connected to a pn-junction diode. Including the antenna-detector impedance mismatch, the detector shows an average NEP of 2.71 pW/ √ Hz such that, together with the antenna, the radiometer promises fully passive and uncooled imaging capabilities with 2.6 K temperature sensitivity at a 10 Hz refresh rate. The design is planned for fabrication and measurement.

THz Imaging Using Uncooled Wideband Direct Detection Focal Plane Arrays

“…Of course, an important condition to facilitate the efficient use of a large operational bandwidth is a wideband impedance match of the antenna feeds with the detector. When the antenna and detector are codesigned, an impedance match over a relative bandwidth of ν = f m a x f min = 3 can be achieved [27]. 1 Effective bandwidth is defined as the average optical efficiency,η op t , times the absolute bandwidth, Δf R F : Δf eff R F =η op t Δf R F (See Section II-A) 2 A 1 Hz postdetection bandwidth is equivalent to 0.5 s of detector integration time; Δf PD = 1 2 τ in t [21].…”