Title :
Log-domain quadrature sinusoidal oscillator based on lossless integrator and all-pass filter
Author :
Prommee, Pipat ; Somdunyakanok, Montri ; Angkeaw, Krit
Author_Institution :
Telecommun. Eng. Dept., King Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok, Thailand
Abstract :
A log-domain current-mode quadrature sinusoidal oscillator based on all-pass filter and lossless integrator is presented. The oscillator is realized by a first-order differential equation for obtaining all pass filter and lossless integrator. The proposed oscillator can be electronically tuned by adjusting bias currents. The proposed oscillator contains 18 NPN transistors, 2 grounded capacitors and 11 bias currents for achieving low-power and fast response. A validated BJT model is used in SPICE simulation operated from a single power supply as low as 2.5V. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortion of signal output is obtained around 0.55%. The oscillation frequency can be operated more than 100MHz which enables fully integrated in telecommunication systems and suitable for high-frequency applications. SPICE simulation results are included.
Keywords :
all-pass filters; bipolar transistors; circuit tuning; current-mode circuits; differential equations; harmonic distortion; integrating circuits; low-power electronics; oscillators; NPN transistors; SPICE simulation; all-pass filter; bias currents; electronic tuning; first-order differential equation; grounded capacitors; log-domain current-mode quadrature sinusoidal oscillator; lossless integrator; oscillation frequency; total harmonic distortion; validated BJT model; Active filters; Capacitors; Oscillators; Power harmonic filters; Transfer functions; Transistors; electronically-controlled; high-frequency; log-domain filtering; low-voltage; quadrature oscillator;
Conference_Titel :
TENCON 2011 - 2011 IEEE Region 10 Conference
Conference_Location :
Bali
Print_ISBN :
978-1-4577-0256-3
DOI :
10.1109/TENCON.2011.6129195
