DOI: 10.1109/TMTT.2024.3410997   IEEEXplore: https://ieeexplore.ieee.org/document/10566047

LNA and Two VGAs in 90 nm CMOS; VGA1 with Coupled-Transmission-Line (CTL) Feedback; VGA2 without CTL Feedback

28 GHz

Gain linearity boosting is achieved with an auxiliary-gain-linearity-enhancement (AGLE) stage in parallel with the output stage. AGLE contributes an in-phase gain and exhibits better linearity due a to higher drain–source voltage (VDS) in this stage of the amplifier. Coupled transmission fine feedback in VGA1 further enhances gain and enhances noise figure performance. Dynamic threshold MOS (DTMOS) structures with a large body resistance between the body and the gate increase the maximum achievable S21 and reduces the minimum S21 in the amplifier stages to enhance the tuning range.

Millimeter-wave transceivers.

LNA: <-10 dB S11; 21.8 dB ± 1.5 dB S21; 21.9-29.1 GHz f3dB; 1.98 dB / 2.32 dB NFmin / NFavg; -10 dB IIP3. VGA1: 36.8 dB Gain Tuning Range (-15.2 to 21.6 dB); <-10 dB S11; 20.1 dB ± 1.5 dB S21; 21.9-29.1 GHz f3dB; 1.74 dB / 2.1 dB NFmin / NFavg; -8.7 dB IIP3. VGA2: 35.6 dB Gain Tuning Range (-14.6 to 21 dB); <-10 dB S11; 20.1 dB ± 1.5 dB S21; 21-27.9 GHz f3dB; 1.99 dB / 2.28 dB NFmin / NFavg; -8.7 dB IIP3.