Title :
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
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;
Conference_Titel :
VLSI Design (VLSI Design), 2011 24th International Conference on
Conference_Location :
Chennai
Print_ISBN :
978-1-61284-327-8
Electronic_ISBN :
1063-9667
DOI :
10.1109/VLSID.2011.25
