A low-power, high-frequency, all-NMOS all-current-mirror sinusoidal quadrature oscillator |
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Authors: | A Leelasantitham |
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Affiliation: | School of Communications, Instrumentation and Control Systems, Sirindhorn International Institute of Technology, Bangkadi, Thammasat University, 160 Moo 5, Tiwanont Road, Bangkadi, Muang Pathumtani 12000, Thailand |
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Abstract: | A low-power, high-frequency, sinusoidal quadrature oscillator is presented through the use of only current mirrors where the small-signal paths are realized through all NMOS transistors. The technique is relatively simple based on (i) inherent time constant of current mirrors, i.e. the internal capacitances and the transconductance of a diode-connected NMOS, (ii) a negative resistance formed by a transconductance of a diode-connected NMOS load of a current mirror. No external passive components are required. As a particular example, a 2.83 GHz, 0.374 fT, 0.38 mW sinusoidal quadrature oscillator is demonstrated. Total harmonic distortions are less than 0.8%. The oscillation frequency is current-tunable over a range of 640 MHz or 22.62%. The amplitude matching and the quadrature phase matching are better than 0.04 dB and 0.17°, respectively. A figure of merit called a normalized carrier-to-noise ratio is 158.23 dBc/Hz at the 2 MHz offset from 2.83 GHz. Comparisons to other approaches are also presented. |
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Keywords: | Sinusoidal quadrature oscillator All-NMOS Only current mirrors Negative resistance Low power High frequency Figure of merits |
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