Benchmarking and Validation of Sub-mW 30GHz VG-LNAs in 22nm FDSOI CMOS for 5G/6G Phased-Array Receivers

TL;DR

This paper benchmarks two low-power 30GHz variable-gain LNAs in 22nm FDSOI CMOS for 5G/6G phased-array receivers, validating a new design methodology that achieves record low power and compact size.

Contribution

It introduces a new class of VG-LNAs with fewer gain-control voltages and validates their performance and design methodology in 22nm FDSOI CMOS technology.

Findings

VG-LNA2 has comparable performance to VG-LNA1 with lower power.

The new design methodology achieves record low-power and small size.

Performance is robust across different gain control arrangements.

Abstract

Next-generation (5G/6G) wireless systems demand low-power mm-wave phased-array ICs. Variable-gain LNAs (VGLNAs) are key building blocks enabling hardware complexity reduction, performance enhancement and functionality extension. This paper reports a performance benchmarking of two low-power 30GHz VG-LNAs for phased-array ICs, which provide a 7.5dB gain control for 18dB Taylor taper in a 30GHz 8x8 antenna array, for a comprehensive validation of the new class of VGLNAs and its design methodology. In particular, this paper reports a second and implementation (VG-LNA2) with a reduced number (four) of gain-control back-gate voltages and super-low-Vt MOSFETs, with respect to the previous first implementation (VG-LNA1) with six gain-control back-gate voltages and regular- Vt MOSFETs, both in the same 22nm FDSOI CMOS technology. The results show that VG-LNA2 exhibits performance comparable to those of VG-LNA1, with a slightly lower power consumption. Overall, the performance benchmarking shows that the design methodology adopted for the new class of VG-LNAs leads to record low-power consumption and small form factor solutions reaching the targeted performances, regardless of the arrangements of the back-gate voltages for gain control and transistor sets, resulting in a comprehensive validation of the innovative design features and effective design methodology.