中圖分類號： TN722 文獻標識碼： A DOI：10.16157/j.issn.0258-7998.200302 中文引用格式： 彭林,，李嘉進,，梁釗銘,，等. 基于LC巴倫的偽差分功率放大器設計[J].電子技術應用，2020,，46(8)：9-12. 英文引用格式： Peng Lin,，Li Jiajin，Liang Zhaoming,，et al. Design of pseudo-differential power amplifier based on LC balun[J]. Application of Electronic Technique,，2020，46(8)：9-12.
Design of pseudo-differential power amplifier based on LC balun
Peng Lin,，Li Jiajin,，Liang Zhaoming，Zhang Guohao
School of Information Engineering,，Guangdong University of Technology,，Guangzhou 510006，China
Abstract： In order to greatly improve the system capacity in local hotspots, the wireless communication infrastructure that can support high-frequency and wideband operation is required for ultra-dense networking. A 4.8～5.0 GHz three-stage high-gain and large-output power amplifier is designed using GaAs heterojunction bipolar transistor(HBT) process to be targeted for 5G microcells. The pseudo-differential structure is adopted to suppress the influence of ground parasitic inductance, while the conversion between single-ended and differential pairs is completed by off-chip low-loss LC balun. In conjunction with active adaptive bias network and RC negative feedback circuit, meanwhile applying the methods of wideband matching and predistortion compensation, ADS(Advanced Design System) simulations verified that the proposed power amplifier can achieve 35.8 dB power gain with 33.5% peak power-added efficiency at a center frequency of 4.9 GHz, and deliver not less than 35 dBm saturated output power in the operating band, which can meet the requirements of seamless coverage of network signals in typical application scenarios.
Key words : balun,；pseudo-differential; radio frequency power amplifier(RFPA),；adaptive bias；5G microcell
0 引言
作為新一代移動通信技術,，兼具高數(shù)據(jù)率,、低時延與高可靠性的商用5G網(wǎng)絡將逐步滲透到社會各個領域，以用戶為中心構建全方位的信息生態(tài)系統(tǒng),，可滿足未來海量設備接入通信的需求,。毫米波技術和Sub-6 GHz同屬于3GPP(3rd Generation Partnership Project)規(guī)定的5G標準，但由于毫米波的波長較短,，所致其信號傳輸衰耗大,，易受環(huán)境的影響；Sub-6 GHz則是LTE(Long Term Evolution)頻段向上延續(xù)而來的帶寬資源,，支持廣域覆蓋,、高移動性服務等業(yè)務場景，一定程度上能夠利用現(xiàn)有的基站設施從而簡化5G部署[1],。按照規(guī)劃,，國內(nèi)蜂窩網(wǎng)絡運營商將在3.3～3.6 GHz以及4.8～5.0 GHz上進行5G的初期組網(wǎng)。
