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This paper describes a new approach for designing analog predistorters that can compensate for the nonlinear distortion of laser drivers in a radio-over-fiber(RoF) system.In contrast to previous works,this paper analyzes the transfer characteristics of CMOS transistors,by combining parallel currents of CMOS transistors in various W/L and negative bias voltages to realize the tunable analog predistortion function.The circuit is fabricated by a standard 0.18μm CMOS technology.The core circuit current consumption is only 15 mA and the entire driver circuit works in a band-pass from 1 ~2.2GHz.Experimental results of two-tone tests have shown that with an analog predistortoer the IIP3 of the laser driver circuit has an improvement of 4.91 dB.
This paper describes a new approach for designing analog predistorters that can compensate for the nonlinear distortion of laser drivers in a radio-over-fiber (RoF) system. Contrast. In contrast to previous works, this paper analyzes the transfer characteristics of CMOS transistors, by combining parallel currents of CMOS transistors in various W / L and negative bias voltages to realize the tunable analog predistortion function. The circuit is fabricated by a standard 0.18 μm CMOS technology. The core circuit current consumption is only 15 mA and the entire driver circuit works in a band-pass from 1 to 2.2 GHz. Experimental results of two-tone tests have shown that with an analog predistorter the IIP3 of the laser driver circuit has an improvement of 4.91 dB.