A waveform generator circuit for extra low-frequency CMOS micro-power applications

作者：Al Darkazly Ibtisam A Abbas; Hasan S M Rezaul^*

来源：International Journal of Circuit Theory and Applications, 2016, 44(2): 266-279.

DOI：10.1002/cta.2074

• extra low frequency (ELF)
• operational trans-conductance amplifier (OTA)
• Schmitt trigger
• waveform generator

This paper presents a novel low-power CMOS extra low-frequency (ELF) waveform generator based on an operational trans-conductance amplifier (OTA). The generator has been designed and fabricated using 2.5-V devices available in 130-nm IBM CMOS technology with a +/- 1.2-V voltage supply. Using the same topology, two sets of device dimensions and circuit components are designed and fabricated for comparing relative performance, silicon area and power dissipation. The first design consumes 691W, while the second design consumes 943W using the same voltage supply. This low-power performance enables the circuit to be used in many micro-power applications. ELF oscillation is achieved for the two designs being around 3.95Hz and 3.90Hz, respectively, with negligible waveform distortion. The measured frequencies agree well with the simulation results. The first design is found to provide overall optimal performance compared to the second design at the expense of higher silicon area.

• 出版日期2016-2