A. Leelasantitham and B. Srisuchinwong
A HighFrequency LowPower LowPassFilterBased AllCurrentMirror Sinusoidal Quadrature Oscillator
1227 - 1232
2008
2
6
International Journal of Electronics and Communication Engineering
https://publications.waset.org/pdf/163
https://publications.waset.org/vol/18
World Academy of Science, Engineering and Technology
A highfrequency lowpower sinusoidal quadrature
oscillator is presented through the use of two 2ndorder lowpass
currentmirror (CM)based filters, a 1storder CM lowpass filter and
a CM bilinear transfer function. The technique is relatively simple
based on (i) inherent time constants of current mirrors, i.e. the
internal capacitances and the transconductance of a diodeconnected
NMOS, (ii) a simple negative resistance RN formed by a resistor load
RL of a current mirror. Neither external capacitances nor inductances
are required. As a particular example, a 1.9GHz, 0.45mW, 2V
CMOS lowpassfilterbased allcurrentmirror sinusoidal quadrature
oscillator is demonstrated. The oscillation frequency (f0) is 1.9 GHz
and is currenttunable over a range of 370 MHz or 21.6 . The
power consumption is at approximately 0.45 mW. The amplitude
matching and the quadrature phase matching are better than 0.05 dB
and 0.15°, respectively. Total harmonic distortions (THD) are less
than 0.3 . At 2 MHz offset from the 1.9 GHz, the carrier to noise
ratio (CNR) is 90.01 dBcHz whilst the figure of merit called a
normalized carriertonoise ratio (CNRnorm) is 153.03 dBcHz. The
ratio of the oscillation frequency (f0) to the unitygain frequency (fT)
of a transistor is 0.25. Comparisons to other approaches are also
included.
Open Science Index 18, 2008