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Journal of Electrical and Computer Engineering
Volume 2016, Article ID 2138794, 6 pages
http://dx.doi.org/10.1155/2016/2138794
Research Article

A Four Quadrature Signals’ Generator with Precise Phase Adjustment

1College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou 310018, China
2Jiangsu Key Laboratory of ASIC Design, Nantong University, Nantong, China

Received 13 February 2016; Revised 13 April 2016; Accepted 28 April 2016

Academic Editor: Ahmed M. Soliman

Copyright © 2016 Xiushan Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A four-way quadrature signals generator with precise phase modulation is presented. It consists of a phase precision regulator and a frequency divider. The phase precision regulator generates two programmable currents by controlling the conduction of the tail current sources and then changes the currents into two bias voltages which are superimposed on the clock signals to adjust the phase difference of the four quadrature signals generated by the frequency divider, making the phase difference of 90 degrees. The four quadrature signals’ generator with precise phase modulation has been implemented in a 0.18 μm mixed-signal and RF 1P6M CMOS technology. The size of the chip including the pads is . The circuit uses a supply voltage of 1.8 V, a bias current of 7.2 μA, and the bits of phase-setting input level in the design. The measured results of the four orthogonal signals’ phase error can reach ±0.1°, and the phase modulation range can reach ±3.6°.