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Novel AM/FM/ASK/FSK/PSK/QAM Signal Generator Based on a Digitally Programmable CDTA

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Abstract

In this paper, a novel \(\pm \)0.8V current differencing transconductance amplifier (CDTA) with programmable and tunable ability is proposed and analyzed. The digitally programmable CDTA is built around a lot of programmable current mirror arrays and three linear tunable transconductors, which contains separate analog and digital tuning feature. Moreover, a CDTA-based general sinusoidal signal generator circuit with two fixed-value capacitors and two grounded resistors is presented here. The generator circuit can be configured to perform the following signal modulation techniques: amplitude modulation, frequency modulation, amplitude shift keying, frequency shift keying, phase shift keying, and quadrature amplitude modulation. Cadence Virtuoso Analog Design Environment using GlobalFoundries’ 0.18 um CMOS process is used to develop the generator circuit and verify the theory by the post-layout simulations.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (No. 61274020), the natural science foundation of Hunan Province (NO. 14JJ7026), and the Open Fund Project of Key Laboratory in Hunan Universities (No. 13K015). We would like to thank the authors whose works we have cited throughout our paper and also thank the individuals who reviewed this article and gave valuable comments.

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  1. College of Information Science and Engineering, Hunan University, Changsha, 410082, People’s Republic of China

    Zanming Xia, Chunhua Wang, Jie Jin, Sichun Du, Hairong Lin & Huai Yang

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  1. Zanming Xia
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  2. Chunhua Wang
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  4. Sichun Du
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Correspondence to Chunhua Wang.

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Xia, Z., Wang, C., Jin, J. et al. Novel AM/FM/ASK/FSK/PSK/QAM Signal Generator Based on a Digitally Programmable CDTA. Circuits Syst Signal Process 34, 1635–1653 (2015). https://doi.org/10.1007/s00034-014-9921-3

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