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A NEW ENHANCED DIFFERENTIAL CMOS COLPITTS OSCILLATOR

AMIR EBRAHIMI

School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA 5005, Australia

Corresponding author.

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and

POURIA YAGHMAEE

School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA 5005, Australia

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https://doi.org/10.1142/S0218126614500030Cited by:4 (Source: Crossref)

Abstract

This paper represents a new enhanced Colpitts oscillator, which is designed based on g_m-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.

This paper was recommended by Regional Editor Piero Malcovati.

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