Design of Wide Band CMOS VCO with Common Source Transformer Feedback Topology

Meng-Ting Hsu, Ying-Hsiang Huang, Cheng-Chuan Chung

Microwave Communication and Radio Frequency Integrated Circuit Lab, Department and Institute of Electronic Engineering, National Yunlin University of Science and Technology, Douliou, Chinese Taipei.

DOI: 10.4236/wet.2013.41004                

Abstract

This paper demonstrates wide-band CMOS VCO based on the transformer feedback from traditional circuit to our proposed work. The start up condition of the traditional cross-coupled pair is expressed by the high frequency model. The wide band technique of this structure is derived with the help of the high frequency model of the transistor. Therefore, the wide band CMOS VCO based on the common source transformer feedback topology can achieves the high performance in the low voltage and low phase noise. The measurement result of the VCO exhibits the figure of merit, core power consumption and output power at supply voltage 0.8 V are –193.1 dBc/Hz, 4.4 mW and –2.3 dBm, respectively. The phase noise is –124.3 dBc/Hz at 1 MHz offset under the operation frequency 5.8 GHz. And the tuning range of the circuit can obtain 28%, this VCO is fabricated in TSMC 0.18 μm 1P6MCMOS process.

Keywords

Voltage Controlled Oscillator (VCO); Transformer Feedback; Low Phase Noise; Wide Tuning Range; Low Voltage

Conflicts of Interest

The authors declare no conflicts of interest.

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