300 GHz vector‐sum phase shifter using InP DHBT amplifiers

Abstract

A vector-sum phase shifter that provides 90°phase control with a positive signal gain is successfully demonstrated at WR-3 band. The integrated circuit consists of input and output microstrip power dividers and two InP DHBT amplifiers with a 300 GHz gain of 14.8 dB. The measurements on a fabricated phase shifter show offset phases of − 46°, − 22°, 0°, 25°, 57°and signal gain of 7.7 to 10.1 dB at 300 GHz.

A 270 – 330 GHz Vector Modulator Phase Shifter in 130nm SiGe BiCMOS

“…Multistage cascade amplification has been utilized in [2], [3], and [6]. Therefore, the highest gain and dissipated DC power have been reported.…”

“…Gilbert cells are used to realize the VGA circuitry with I and Q signals applied to the tail transistors and gain controlling signals to the differential pairs. Due to the simplicity of the Gilbert cell circuitry, it has primarily been the candidate for such high frequencies [1] - [6]. The inductance Lcp partly compensates the capacitances reside in the translinear loop [10].…”

“…One approach to address the issues is the phased array antenna solution, i.e. beamforming [1] - [6].…”

“…Since the vector modulators are in favor of gain and smoother phase variation, directly proportional to the control mechanism e.g. number of bits in case of DAC controlled ones, they have been widely utilized in almost every frequency band [1] - [6]. Compact size has been achieved at the cost of DC power consumption compared to their passive counterparts [7] - [9].…”

A 275 GHz Active Vector-Sum Phase Shifter

“…This cascaded VGA configuration was initially proposed with a built-in half-wave delay line [4] and later implemented as an integrated circuit at 10 GHz using a 180 balun at the input [5]. Previously at 300 GHz, a single quadrature vector-sum branch has been demonstrated with the phase control range limited to 90 only [6]. This letter discusses the phase shifter shown in Fig.…”