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A Novel Time Domain Noise Model for Voltage Controlled Oscillators

Circuits and Systems 2013年第1期4卷 97-105页

作者： Li Ke Peter Wilson reuben wilcock Electronics and Computer Science University of Southampton Southampton UK

This paper describes a novel time domain noise model for voltage controlled oscillators that accurately and efficiently predicts both tuning behavior and phase noise performance. The proposed method is based on device level flicker and thermal noise models that have been developed in Simulink and although the case study is a multiple feedback four delay cell architecture it could easily be extended to any similar topology. The strength of the approach is verified through comparison with post layout simulation results from a commercial simulator and measured results from a 120 nm fabricated prototype chip. Furthermore, the effect of control voltage flicker noise on oscillator output phase noise is also investigated as an example application of the model. Transient simulation based noise analysis has the strong advantage that noise performance of higher level systems such as phase locked loops can be easily determined over a realistic acquisition and locking process yielding more accurate and reliable results.

关键词： Voltage Controlled Oscillators Noise Model Simulation

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A Novel Signal Processing Coprocessor for <i>n-</i>Dimensional Geometric Algebra Applications

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Circuits and Systems 2014年第11期5卷 274-291页

作者： Biswajit Mishra Mittu Kochery Peter Wilson reuben wilcock VLSI & Embedded Research Lab Dhirubhai Ambani Institute of Information and Communication Technology (DAIICT) Gandhinagar India Advanced RISC Machines Ltd. (ARM) Cambridge UK School of Electronics and Computer Science University of Southampton Southampton UK

This paper provides an implementation of a novel signal processing co-processor using a Geometric Algebra technique tailored for fast and complex geometric calculations in multiple dimensions. This is the first hardware implementation of Geometric Algebra to specifically address the issue of scalability to multiple (1 - 8) dimensions. This paper presents a detailed description of the implementation, with a particular focus on the techniques of optimization used to improve performance. Results are presented which demonstrate at least 3x performance improvements compared to previously published work.

关键词： Geometric Algebra Clifford Algebra FPGA GA Co-Processor

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