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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Issue 5 • Date May 2002

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Displaying Results 1 - 8 of 8
  • Improved switched tuning of differential CMOS VCOs

    Publication Year: 2002 , Page(s): 352 - 355
    Cited by:  Papers (44)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (215 KB) |  | HTML iconHTML  

    Varactors for continuous frequency tuning are typically used in LC-oscillators. However, they have some drawbacks for large tuning ranges, such as high tuning sensitivity causing high sensitivity to noise and disturbances on the control voltage. Furthermore, large metal-oxide-semiconductor (MOS) varactors have high conversion of harmless amplitude noise into harmful phase noise. To reduce these pr... View full abstract»

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  • Automatic calibration of modulated frequency synthesizers

    Publication Year: 2002 , Page(s): 301 - 311
    Cited by:  Papers (11)  |  Patents (11)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (391 KB) |  | HTML iconHTML  

    This paper describes a new approach to the automatic calibration of modulated phase-locked loop (PLL) frequency synthesizers. The new calibration approach tunes the response of the PLL while the synthesizer is in service and compensates for process and temperature variation. The availability of this new calibration method allows the use of precompensation techniques to achieve high data rate modul... View full abstract»

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  • Analysis of power recycling techniques for RF and microwave outphasing power amplifiers

    Publication Year: 2002 , Page(s): 312 - 320
    Cited by:  Papers (16)  |  Patents (62)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (353 KB) |  | HTML iconHTML  

    A power recycling technique has been analyzed for efficiency-enhanced radio-frequency (RF) and microwave outphasing power amplifiers for mobile wireless communications. By use of a simple power recycling network, a considerable portion of the wasted power can be recovered back to the power supply, and the enhancement of the overall power efficiency can be achieved without sacrificing the high-line... View full abstract»

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  • Design of low-phase-noise CMOS ring oscillators

    Publication Year: 2002 , Page(s): 328 - 338
    Cited by:  Papers (34)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (396 KB) |  | HTML iconHTML  

    This paper presents a framework for modeling the phase noise in complementary metal-oxide-semiconductor (CMOS) ring oscillators. The analysis considers both linear and nonlinear operations, and it includes both device noise and digital switching noise coupled through the power supply and substrate. In this paper, we show that fast rail-to-rail switching is required in order to achieve low phase no... View full abstract»

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  • A polyphase IIR adaptive filter

    Publication Year: 2002 , Page(s): 356 - 359
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (275 KB) |  | HTML iconHTML  

    A polyphase structure for infinite-impulse response (IIR) adaptive filtering is proposed and compared to the direct structure in terms of their reduced error surface. It is shown that the general shape of its surface can make the polyphase structure have higher convergence speed, alleviating the problem of convergence speed in IIR adaptive filters and allowing their computational complexity gain o... View full abstract»

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  • An approach to switching activity consideration during high-level, low-power design space exploration

    Publication Year: 2002 , Page(s): 339 - 351
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (390 KB) |  | HTML iconHTML  

    A novel approach is introduced that exploits characteristics of fixed-point, two's complement data in order to reduce power consumption related to switching activity. This approach is based on an intuitive switching activity model that captures the most essential data characteristics with statistical parameters. The approach is embodied in a heuristic that uses the model to systematically reduce s... View full abstract»

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  • Analog VLSI neural network with digital perturbative learning

    Publication Year: 2002 , Page(s): 359 - 368
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (355 KB) |  | HTML iconHTML  

    Two feed-forward neural-network hardware implementations are presented. The first uses analog synapses and neurons with a digital serial weight bus. The chip is trained in loop with the computer performing control and weight updates. By training with the chip in the loop, it is possible to learn around circuit offsets. The second neural network also uses a computer for the global control operation... View full abstract»

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  • Spectral analysis of time-domain phase jitter measurements

    Publication Year: 2002 , Page(s): 321 - 327
    Cited by:  Papers (18)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (259 KB) |  | HTML iconHTML  

    A simplified overview of time-domain jitter measurements is presented in this paper. The relationship between the time-domain jitter measurements and the power spectrum of the phase jitter is described using fundamental Fourier properties and basic random variables analysis. This leads to a unifying analysis and the results are in agreement with commonly accepted understanding of jitter accumulati... View full abstract»

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Aims & Scope

This title ceased production in 2003. The current updated title is IEEE Transactions on Circuits and Systems II: Express Briefs.

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