Conference Paper

Design of high performance and wide-band VCO with transformer feedback

Dept. & Inst. of Electron. Eng., Nat. Yunlin Univ. of Sci. & Technol., Douliou
DOI: 10.1109/APMC.2008.4958309 Conference: Microwave Conference, 2008. APMC 2008. Asia-Pacific
Source: IEEE Xplore


This paper presents a very low supply voltage, low phase noise and wide tuning range CMOS LC voltage-controlled oscillator with a transformer feedback for a wide-band front-end receiver by a standard 0.18-mum CMOS process. The VCO take an optimum differential transformer to achieve maximize quality factor and minimize the chip area and switching capacitor module are used to maintain a large tuning range. The VCO core power consumption is 6.9 mW from 0.6 V supply and operates with a wide-band from 4.16-5.47 GHz. The measured phase noise is -111.5 dBc/Hz at 1 MHz offset from the carrier frequency at 5.45 GHz.

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    ABSTRACT: A low power CMOS LC Voltage Controlled Oscillator (VCO) with body-biasing and Q-enhancement techniques is presented. This circuit was taped out by TSMC 0.18um 1P6M process. The measured result of the VCO exhibits a tuning range of 9.1% from 4.99GHz to 5.43GHz at the supply voltage of 1V. The power consumption of the core circuit, output power and figure of merit (FOM) are 3mW, -1.06dBm and -192.4dBc/Hz. The phase noise is -122.7dBc/Hz@1MHz at the operation frequency of 5.27GHz.
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    ABSTRACT: In this paper, we present low phase noise and low power of the voltage-controlled oscillators (VCOs) for 5 GHz applications. This chip is implemented by Taiwan Semiconductor Manufacturing Company (TSMC) standard 0.18µm CMOS process. The designed circuit topology is included a modified conventional pmos cross couple configuration. It is adopted pseudo resistance and using negative resistance enhancement technique. At the supply voltage 1v, the measured output phase noise is −120.13 dBc/Hz at 1MHz offset frequency from the carrier frequency of 5.47 GHz. The core power consumption is 2.65 mW, and tuning range of frequency is about 900MHz, from 4.68 to 5.58 GHz. The chip area is 0.754×0.544 (mm2).
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    ABSTRACT: Nowadays, ICs work in high speed and high frequency environments, the effects that package brings has become more and more obvious. These effects can be classified as signal integrity (SI) and power integrity (PI). In this paper, A VCO detector circuit with broadband and sensitivity characterizations is designed and used to evaluate on-package DC IR-drop and signal-integrity. The package structure we used in this paper is wire-BGA. The methods for testing IR-drop and SI effects by this wide tuning range and high tuning sensitivity VCO with different package circuit design were shown in this research. Thus, these effects can be observed from the relationship between voltage, frequency, and the trend of the output sweeps.
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