Title :
Performance-optimized microstrip coupled VCOs for 40-GHz and 43-GHz OC-768 optical transmission
Author :
Shaeffer, Derek K. ; Kudszus, Steffen
Author_Institution :
Big Bear Networks Inc., Sunnyvale, CA, USA
fDate :
7/1/2003 12:00:00 AM
Abstract :
In this paper, we present 40- and 43-GHz voltage-controlled oscillators (VCOs) for use in SONET/SDH optical transmission systems operating at OC-768 rates. SONET system jitter requirements are explained, as are methods for achieving the requisite performance in manufacturable oscillators. We describe in detail a technique for using quadrature-coupled VCOs to achieve a fundamental improvement in jitter power performance. The 40-GHz oscillator has a tuning range of 5 GHz, a single-sideband phase-noise power spectral density of -99 dBc/Hz at 1-MHz offset from the carrier, and consumes 207 mW in the oscillator core. Total power consumption is 363 mW (including biasing and output buffers) from a 3-V supply. The oscillator occupies 0.189 mm2 of die area and is implemented in a 120-GHz fT SiGe BiCMOS process.
Keywords :
BiCMOS analogue integrated circuits; Ge-Si alloys; SONET; jitter; microstrip circuits; optical communication equipment; phase noise; semiconductor materials; synchronous digital hierarchy; voltage-controlled oscillators; 207 mW; 3 V; 363 mW; 40 GHz; 43 GHz; OC-768; SONET/SDH optical transmission system; SiGe; SiGe BiCMOS process; jitter power optimization; microstrip coupled VCO; power consumption; quadrature-coupled VCO; single-sideband phase noise power spectral density; tuning range; voltage-controlled oscillator; Energy consumption; Jitter; Manufacturing; Microstrip; Optical buffering; Optical coupling; Optical tuning; SONET; Synchronous digital hierarchy; Voltage-controlled oscillators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2003.813218
