Wideband Analog IF Filter for Very High Speed Wireless Receivers

  • Shahbaz Abbasi

Student thesis: Master's Thesis

Abstract

With improvements in standard CMOS technologies, commercial interest in high frequency bands, like millimeter-wave has grown. Wireless communication systems have started to migrate to such frequencies because of the huge bandwidth available, which provides high data rates with high energy efficiency. Millimeterwave transceivers are finding new circuit implementations that promise improved performance, and entirely new applications in the millimeter-wave band have become feasible. Circuit designers are facing new sets of problems, especially in the Front- End circuits. This thesis presents a broadband lowpass filter for the analog baseband portion of a millimeter-wave MIMO receiver. The thesis first introduces a MATLAB model and describes how this model was used to derive filter specifications such as 3dB Frequency, passband frequency and stopband frequency. Details about the overall design goals, including gain, bandwidth, noise and power consumption, and the analytical methods used to arrive at these goals have been explained next. Before going to the major contributions of this work, some bandwidth enhancement techniques have been explored and an important tradeoff between area and the high frequency linearity of the circuit has been discussed. Subsequently, a detailed explanation of the filter design is given. Small-signal and noise analyses are presented for the filtering and gain stages. Next, details about the gain controller are given and the biasing circuits have been briefly discussed. At the end, simulated results for the overall circuit, including AC response, group delay, transient response and distortion are shown. The overall simulated operation of the filter was deemed satisfactory for the multi-chain MIMO receiver.
Date of AwardDec 2012
Original languageAmerican English
SupervisorAyman Shabra (Supervisor)

Keywords

  • Wireless Sensor Networks
  • Analog Computers

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