Scholarlink

<p>This paper presents a CMOS up-conversion mixer for Ka-band low Earth orbit (LEO) satellite communications (SATCOM) user terminal (UT) transmitter. The up-conversion mixer constitutes a balun-quadrature coupler (QC)-based differential I/Q LO generator, a three-stage-poly-phase filter (PPF)-based differential I/Q IF generator with following buffer amplifier, a double-balanced-Gilbert-cell-based mixer core, and an active RF adder with differential outputs. Wideband input reflection coefficient S<sub>33</sub>, i.e., wide -10&#xa0;dB input matching bandwidth (f<sub>10dB</sub>) of 13.6&#xa0;GHz (21.9–35.5&#xa0;GHz), is achieved at the LO-port due to the intrinsic dual dips (at 26.7 and 33.1&#xa0;GHz) in S<sub>33</sub> frequency response. B-to-G-with-R<sub>B</sub> topology, i.e., DTMOS-with-R<sub>B</sub> topology, is utilized in the LO switch transistors (controlled by the differential I/Q LO input signals) for achieving better on/off switch property due to reduced/increased threshold voltage (V<sub>th</sub>) in on/off state. B-to-D-with-R<sub>B</sub> topology is adopted in the transistors of the active RF adder to achieve higher conversion gain (CG) due to reduction of V<sub>th</sub> (i.e., increase of transconductance g<sub>m</sub>) under the same or lower power consumption (through the adoption of a lower supply voltage). Moreover, the series inductive peaking technique is utilized at the differential input nodes of the active RF adder to further enhance the CG of the up-conversion mixer. The up-conversion mixer consumes 24.6 mW, and achieves decent LO-port input matching bandwidth of 13.6&#xa0;GHz (21.9–35.5&#xa0;GHz), CG of 14.6 ± 1.5&#xa0;dB for 26.6–33.6&#xa0;GHz (i.e., 3-dB CG bandwidth (f<sub>3dB</sub>) of 7&#xa0;GHz), and OP<sub>1dB</sub> of 1.7 ~ 4.8 dBm and OIP3 of 8.7–14.7 dBm for 25–35 GHz.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

CMOS Up-Conversion Mixer Using B-to-G-with-RB and B-to-D-with-RB Transistors for Ka-Band LEO SATCOM User Terminal Transmitter

  • 期刊论文

  • 发表日期：

    2025年10月10日

查看全文
  • Yo-Sheng Lin,
  • Chung-Ta Huang,
  • Yu-Rong He

摘要

This paper presents a CMOS up-conversion mixer for Ka-band low Earth orbit (LEO) satellite communications (SATCOM) user terminal (UT) transmitter. The up-conversion mixer constitutes a balun-quadrature coupler (QC)-based differential I/Q LO generator, a three-stage-poly-phase filter (PPF)-based differential I/Q IF generator with following buffer amplifier, a double-balanced-Gilbert-cell-based mixer core, and an active RF adder with differential outputs. Wideband input reflection coefficient S33, i.e., wide -10 dB input matching bandwidth (f10dB) of 13.6 GHz (21.9–35.5 GHz), is achieved at the LO-port due to the intrinsic dual dips (at 26.7 and 33.1 GHz) in S33 frequency response. B-to-G-with-RB topology, i.e., DTMOS-with-RB topology, is utilized in the LO switch transistors (controlled by the differential I/Q LO input signals) for achieving better on/off switch property due to reduced/increased threshold voltage (Vth) in on/off state. B-to-D-with-RB topology is adopted in the transistors of the active RF adder to achieve higher conversion gain (CG) due to reduction of Vth (i.e., increase of transconductance gm) under the same or lower power consumption (through the adoption of a lower supply voltage). Moreover, the series inductive peaking technique is utilized at the differential input nodes of the active RF adder to further enhance the CG of the up-conversion mixer. The up-conversion mixer consumes 24.6 mW, and achieves decent LO-port input matching bandwidth of 13.6 GHz (21.9–35.5 GHz), CG of 14.6 ± 1.5 dB for 26.6–33.6 GHz (i.e., 3-dB CG bandwidth (f3dB) of 7 GHz), and OP1dB of 1.7 ~ 4.8 dBm and OIP3 of 8.7–14.7 dBm for 25–35 GHz.