A new enhanced differential cmos Colpitts oscillator
Date
2014
Authors
Ebrahimi, A.
Yaghmaee, P.
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Journal article
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Journal of Circuits, Systems and Computers, 2014; 23(1):1450003-1-1450003-12
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Amir Ebrahimi and Pouria Yaghmaee
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Abstract
This paper represents a new enhanced Colpitts oscillator, which is designed based on gm-boosting of a conventional Colpitts oscillator. The proposed topology increases the negative resistant and enhances the start-up difficulty of the conventional Colpitts oscillator. This enables the Colpitts oscillator to operate in low-power consumption. Moreover, the differential and balanced structure helps limit even-order harmonics and degrades the common mode noise effects in output. The proposed circuit is designed using 0.18 μm technology and is simulated under 1.8 V supply voltage in advanced design system (ADS). Simulations show the output phase noise of -140 dBc/Hz at 1 MHz offset frequency when the operating frequency is 1 GHz.
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