DOI: 10.1109/TMTT.2024.3483454   IEEEXplore: https://ieeexplore.ieee.org/document/10750055

A 28/37-GHz frequency-reconfigurable dual-band 1-channel front-end IC implemented with a 28 nm FD-SOI process.

28 GHz, 37 GHz

The IC integrates frequency-reconfigurable variable- gain phase shifters (VGPSs) in the transmitter (TX) and receiver (RX) paths that enables gain and phase controls with a single function block in the dual-frequency band. A frequency-reconfigurable power amplifier uses reconfigurable transformers at the output and interstage matching networks. A dual-band variable-gain low-noise amplifier (LNA) utilizes a combined structure of a high-k input transformer and a differential common-gate (CG) for simultaneous noise and input matching. The dual-band switches for the antenna and channel show high isolation and low-noise-figure (NF) degradation.

5G communications

0.9° RMS phase error with 6-bit control resolution and 0.22 dB RMS gain error with 4-bit control resolution (28 GHz), 0.62° and 0.23 dB (37 GHz); 13.5 dBm TX Pout 1dB compression and 15.5% TX peak efficiency (28 GHz), 13.5 dBm and 14.1% (37 GHz); 9.3 dBm average TX Pout(28 GHz), 8.6 dBm TX Pout (37 GHz); 4.4 dB RX NF (28 GHz), 4.9 dB NF (37 GHz)