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Power Consumption Optimization in Radio Receivers

Meghdadi Neyshabouri, Masoud | 2013

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 44653 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Sharif Bakhtiar, Mehrdad; Medi, Ali
  7. Abstract:
  8. This thesis presents a general method for real-time adaptation of wireless receivers according to the prevailing reception conditions. In order to maintain the desired signal quality at the minimum possible power dissipation, the method performs an optimal trade-off between noise, linearity, and power consumption in the building blocks of the receiver. This is achieved by continuously monitoring the signal-to-noise plus interference ratio (SNIR) and accordingly tuning the adaptation parameters embedded in the receiver design. A prototype DVBH receiver chip, implemented in a standard 0.18-µm CMOS process, is used as the test vehicle. By properly trading noise with linearity in the receiver, the method saves power, even for the worst-case test scenarios. For less demanding conditions, a power saving up to seven times is achieved. The experimental results show significant improvement, in both power saving and dynamic range, compared to the existing adaptation methods. Also, this thesis presents a method for optimizing SFDR in differential active-RC filters. Simple analytical expressions for noise and third-order intermodulation (IM3) distortion in active-RC filters are derived. The nonlinear behavior of two-stage Miller-compensated op amps, which are extensively used in active-RC implementations, is also modeled. These expressions and models are used to maximize SFDR in active-RC filters by means of proper admittance scaling and optimizing the share of each op amp in the total power consumption. It is shown that both the power consumption of the filter and its area can be significantly reduced, for a given SFDR, by exploiting the presented method.

  9. Keywords:
  10. Power Management ; Optimization ; Adaptation ; Adaptable Receiver ; Radio Receiver

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