A Fully Integrated K-Band Dual Down-Conversion Receiver for Radar Applications in 90 nm CMOS

IEEE Access

Zipeng Chen¹  Yutian Li¹  Zheng Song¹  Baoyong Chi¹  Zhenwu Wang¹  Yinghang Wu¹  Min Lin²  Shiyan Sun³  Zhiming Chen³  An'an Li³  Yingtao Ding³ 

[1] Institute of Microelectronics, Tsinghua University, Beijing, China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai, China;School of Information and Electronics, Beijing Institute of Technology, Beijing, China;

关键词: Dual-conversion receiver;    image rejection filter;    wireless receiver;    band-pass filter;    automatic gain control loop (AGC);    CMOS;   

DOI  :  10.1109/ACCESS.2020.2968512

来源: DOAJ

【 摘 要 】

A fully integrated K-band dual down-conversion receiver for phased array radar applications in 90 nm CMOS is presented. The receiver utilizes the dual down-conversion architecture to achieve superior performance. The integrated 1.15 GHz image-rejection filter (IRF) provides enough wideband (22 MHz) image rejection ratio at 140 MHz offset before the second down-conversion by utilizing the Q-enhancing and frequency staggering techniques to compensate the component loss. The low noise amplifier realizes the single-to-differential-ended conversion at the input with a transformer and achieves good common-mode rejection. The 70 MHz intermediate frequency baseband consists of two cascaded 3rd-order band-pass active RC filters (BPFs) and one automatic gain control (AGC) loop, with the integrator frequency compensation technique to lower down the requirements on the embedded Op-Amps. Two phase-locked loop (PLL) frequency synthesizers are integrated to provide the local oscillation (LO) signals for the down-conversions, where the matching of the charge-pump is improved by adding one extra current compensation branch. The measurements of the prototype show that the receiver converts the targeted mm-wave signal to 70 MHz intermediate frequency while achieving 8.3 dB noise figure (NF), 51-95 dB variable gain range and >45 dB image rejection ratio at 140 MHz offset with >22 MHz signal bandwidth. The receiver draws 74 mA current (excluding 2 PLLs) from the 1.2 V power supplies and occupies a core area of 4.58 × 0.53mm²(excluding 2 PLLs).

【 授权许可】

Unknown