Design of Analog Circuits through Symbolic Analysis

Design of Analog Circuits through Symbolic Analysis

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Symbolic analyzers have the potential to offer knowledge to sophomores as well as practitioners of analog circuit design. Actually, they are an essential complement to numerical simulators, since ...
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Symbolic Characterization of VCOs and its Application to Optimization Based Design

Pp. 399-412 (14)

M. Helena Fino and Fernando V. Coito

Abstract

This chapter addresses the application of symbolic techniques on the characterization of ring Voltage Controlled Oscillators (VCO). The symbolic characterization of the VCOs comprises both the frequency-control voltage response and a simplified formula for evaluating the phase-noise in the oscillator. Two methodologies are shown for generating the frequency-control voltage response. The first one is based on the evaluation of the delay introduced by each VCO delay cell. In the second an approximate expression for the equivalent resistance of each VCO delay cell load is considered, and used for deriving the VCO model. The adoption of the proposed methodologies to submicron transistor sizes is illustrated. The application of the VCO characterization into an optimization based design is described.

Keywords:

Ring VCO, VCO model, symbolic characterization, optimization-based design, deepsubmicron VCO characterization, semi-symbolic methodology, phase-noise characterization, Maneatis delay cell, equivalent resistance, phase-noise minimization.

Affiliation:

Instituto de Telecomunicações, Lisboa Portugal, FCT/UNL, Portugal