Evolution of Oscillation in a Quadrature Oscillator

Author

Ghosh, Diptendu ; Gharpurey, Ranjit

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Texas at Austin, Austin, TX, USA

fYear

2011

fDate

2-7 Jan. 2011

Firstpage

36

Lastpage

40

Abstract

The growth of oscillation in a quadrature oscillator that employs phase shifters in the coupling-path between a pair of LC-loaded negative resistance cores, is analyzed. Such an oscillator is known to have two stable modes of oscillation. Under a noise-initiated startup from an unstable initial condition, quasiharmonic assumption and the Method of First Approximation are used to demonstrate that compression mechanisms lead to preferential enhancement of one mode, while attenuating the other. The magnitude of phase shift in the coupling-path is shown to directly affect the ratio between temporal rates of mode buildup and decay.

Keywords

frequency synthesizers; oscillations; oscillators; quadrature phase shift keying; LC-loaded negative resistance cores; method of first approximation; oscillation; phase shifters; quadrature oscillator; quasiharmonic assumption; Approximation methods; Couplings; Equations; Mathematical model; Oscillators; Steady-state; Transistors; first approximation; phase shifter; quadrature oscillator; quasiharmonic; stable modes;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Design (VLSI Design), 2011 24th International Conference on

Conference_Location

Chennai

ISSN

1063-9667

Print_ISBN

978-1-61284-327-8

Electronic_ISBN

1063-9667

Type

conf

DOI

10.1109/VLSID.2011.25

Filename

5718774