Igor Vytyaz

Analysis of supply and ground noise sensitivity in ring and LC oscillators

Supply and ground noise sensitivity of a wide variety of ring and LC oscillators has been analyzed based on the perturbation projection vector (PPV) technique. The resulting PPV provides an understanding of how specific frequency content of supply/ground noise is converted to oscillator phase noise. Based on this analysis oscillators that are tolerant of supply/ground noise can be identified and used for low noise oscillator design.

Design and Analysis of Noise Tolerant Ring Oscillators Using Maneatis Delay Cells

The sensitivity of ring VCO designs based on the Maneatis delay cell to extrinsic noise is presented and comparisons are made. Perturbation projection vector and transient analyses are used to reveal the benefits and drawbacks of the designs using basic biasing, boosted biasing, and connected common-source methods.

Sensitivity Analysis for Oscillators

This paper presents an analysis for calculating sensitivities of an oscillators periodic steady-state and perturbation projection vector to design, process, or environmental parameters. A general continuous-time formulation is described. Applications of the oscillator sensitivity analysis in design optimization and macromodeling are demonstrated through examples.

Sensitivity analysis for oscillators

This paper presents an analysis for calculating sensitivities of an oscillators periodic steady-state and perturbation projection vector to design, process, or environmental parameters. A general continuous-time formulation is described. Applications of the oscillator sensitivity analysis in design optimization and macromodeling are demonstrated through examples.

Parameter finding methods for oscillators with a specified oscillation frequency

This paper presents a generalized formulation of the periodic steady-state analysis for oscillators. The new formulation finds the value of a circuit parameter that results in a desired oscillation frequency for the circuit. Numerical methods based on the time-domain finite difference and shooting methods, and the frequency-domain harmonic balance method are described. Comparisons with search-based methods demonstrate the efficacy of the new approach.

Automated Design and Optimization of Low-Noise Oscillators

This paper presents a technique for automated design and optimization of low-noise oscillators. A sensitivity analysis for oscillators guides the reduction of oscillator noise intensities and improvement of oscillators immunity to noise. A design-oriented approach to circuit analysis efficiently handles design constraints and reduces the dimensionality of the optimization problem. The perturbation projection vector based phase noise computation makes the proposed optimization technique general and applicable to all types of oscillators, independent of circuit topology. Several examples illustrate the benefits of the new optimization approach.

Parameter variation analysis for voltage controlled oscillators in phase-locked loops

A new oscillator sensitivity analysis that predicts the impact of parameter variations of a VCO in a PLL is presented in this paper. Sensitivities of an oscillators steady-state performance to design, process, or environmental parameter variations can be accurately and efficiently computed with the proposed analysis.

Periodic steady-state analysis augmented with design equality constraints

A design-oriented periodic steady-state analysis is presented in this paper. The new analysis finds the values of circuit parameters that result in a desired circuit performance specified by a set of equality constraints. This is done by including the design equality constraints and the circuit parameters directly in the steady-state analysis as additional equations and unknowns. A time-domain finite difference method and the numerical implementation for the proposed analysis are described. Several examples demonstrate that the new analysis accurately and efficiently tunes circuit parameters that conform to a wide range of design specifications.

Noise tolerant oscillator design using perturbation projection vector analysis

The impact of an oscillatorpsilas intrinsic and extrinsic noise sources on its noise performance is evaluated using the perturbation projection vector (PPV) analysis. The projection of a perturbation into the phase deviation for white and flicker noise, as well as for deterministic perturbations is explained qualitatively. The PPV analysis is then applied to two ring-type voltage controlled oscillators (VCO). Comparisons with measured results demonstrate the usefulness of the PPV analysis for design of noise tolerant oscillators.

Design-Oriented Analysis of Circuits With Equality Constraints

This paper presents a design-oriented circuit analysis that is augmented with design constraints. This analysis computes the circuit response and also finds the values of circuit parameters (equal to the number of design specifications) that result in a specified circuit performance. An application of this approach is demonstrated for the periodic steady-state analysis with shooting and finite difference formulations. The new analysis with design equality constraints is several times faster than search-based techniques that employ conventional analysis methods.