無線收發裝置

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

107103738

專利證號

I 669912

專利獲證名稱

無線收發裝置

專利所屬機關 (申請機關)

國立交通大學

獲證日期

2019/08/21

技術說明

短距雷達因為雷達回波與發射波間隔過短，頻率幾乎一樣，因此很難使用時域或頻域的方法，將回波與發射波區分開來。因此發射與接收往往得使用兩組天線。造成成本上的浪費。 如果要讓發射與接收使用同一個天線，有兩個常見的方法。第一種是使用鐵磁循環器(Ferrite Circulator)，但這個循環器無法被半導體整合，因而造成成本高昂。第二種方法是使用晶片晶片雙工器 (IBFD, On-chip in-band full duplexers)，但目前已知的架構皆很複雜，造成晶片的製造與測試成的高昂。 本發明巧妙利用切換式放大器本身的運作，在其原本應該接供電壓的地方，加入一個電流供電器。並使用切換式放大器本身已經存在的切換，將其視為一個下轉換的閘泵混頻器(gate-pump down-conversion mixer)。而當電流供電器的低頻阻抗選擇合適時，原本切換式放大器不只能夠順利運作，而且還能夠讓原本切換放大器的輸出端，提供給天線一個匹配的阻抗。同時實現全雙工的收發功能。 For short-distance radar application, the transmitted and received echo signals are nearly overlapped in both time and frequency domain. This makes it impossible to use a half-duplexer (e.g. T/R Switch, Filter Bank) to share the antenna between the transmitter and the receiver. A full duplexer can solve simultaneously transmit and receive signals at same frequency. But, there are two issues of using a full duplexer, 1.) The duplexer is typically implemented using ferrite circulator; which cannot be integrated into standard semiconductor process. 2) On-chip in-band full duplexers (IBFD) does not require ferrite circulator and can be integrated. However, transmitter leakage or self-interference is strong. Prior arts [J. Zhou, N. Reiskarimian and H. Krishnaswamy, "9.8 Receiver with integrated magnetic-free N-path-filter-based non-reciprocal circulator and baseband self-interference cancellation for full-duplex wireless," 2016 IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, 2016, pp. 178-180.], [D. J. van den Broek, E. A. M. Klumperink and B. Nauta, "19.2 A self-interference-cancelling receiver for in-band full-duplex wireless with low distortion under cancellation of strong TX leakage," 2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers, San Francisco, CA, 2015, pp. 1-3.], [D. Yang, H. Yüksel and A. Molnar, "A Wideband Highly Integrated and Widely Tunable Transceiver for In-Band Full-Duplex Communication," in IEEE Journal of Solid-State Circuits, vol. 50, no. 5, pp. 1189-1202, May 2015.] and [B. van Liempd et al., "A +70-dBm IIP3 Electrical-Balance Duplexer for Highly Integrated Tunable Front-Ends," in IEEE Transactions on Microwave Theory and Techniques, vol. 64, no. 12, pp. 4274-4286, Dec. 2016.] use complex and costly circuits to achieve IBFD. Our invention achieves a duplex RF transceiver using the inherently switch-mode operation exists in a switch-mode amplifier. It achieves full duplex transmit and receive without using any external duplexer, and does not requires complexity of prior arts. With our invention, a radar (e.g., a FMCW radar) is allowed to transmit and receive simultaneously via a single antenna to detect object in short distance. An integrated X-band FMCW radar chip is implemented in 65nm CMOS and a wireless measurement with the radar chip was carried to validate our invention.

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