Title :
Time-Varying Root-Locus of Large-Signal LC Oscillators
Author :
Broussev, Svetozar S. ; Tchamov, Nikolay T.
Author_Institution :
Dept. of Commun. Eng., Tampere Univ. of Technol., Tampere, Finland
fDate :
5/1/2010 12:00:00 AM
Abstract :
Time-varying root-locus of a large-signal LC oscillator is obtained via semi-symbolic analysis, where the complex frequency s is a symbol. The steady-state circuit behavior is modeled by its time-varying small-signal admittance matrix within one oscillation period. The roots of the characteristic equation are computed with the QZ method. The time-varying root-locus analysis capabilities are demonstrated on a GHz range 130 nm complementary metal-oxide-semiconductor cross-coupled LC oscillator, and they complement the results obtained with the traditional numerical computer-aided design methods.
Keywords :
CMOS integrated circuits; oscillators; time-varying networks; QZ method; complementary metal-oxide-semiconductor; large-signal LC oscillators; numerical computer-aided design methods; semisymbolic analysis; size 130 nm; steady-state circuit behavior; time-varying root-locus; time-varying small-signal admittance matrix; Admittance; Algorithm design and analysis; Circuits; Computational modeling; Design automation; Oscillators; Phase noise; Radio frequency; Steady-state; Voltage; Oscillator; QZ method; root-locus; semi-symbolic analysis;
Journal_Title :
Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on
DOI :
10.1109/TCAD.2010.2043592
