A CCII-based wide frequency range square waveform generator

作者：De Marcellis Andrea; Di Carlo Claudia; Ferri Giuseppe^*; Stornelli Vincenzo

来源：International Journal of Circuit Theory and Applications, 2013, 41(1): 1-13.

DOI：10.1002/cta.781

• analog CMOS integrated circuit
• CCII
• low-voltage low-power
• square waveform generator
• oscillator
• wide frequency range

In this paper, we propose a novel current-mode solution suitable for the square waveform generation. The designed oscillator, which utilizes only two positive second-generation current conveyors as active blocks, six resistors and a capacitor, is based on a current differentiation, instead of voltage integration, typical of developed solutions both in voltage-mode and in current-mode approaches, so avoiding circuit limitations due to the node saturation effects. The proposed circuit has been designed, as an integrated solution at transistor level, in a standard CMOS technology, with low-voltage (+/- 1V) and low-power (430 mu W) characteristics. Simulation results have confirmed the good circuit behaviour, also for working temperature drifts, showing good linearity in a wide oscillation frequency range, which can be independently adjusted through either capacitive (in the range pF-mu F) or resistive (in the range M Omega-G Omega) external passive components. Waiting for the chip fabrication, preliminary measurements have been performed using a laboratory breadboard employing the CCII with AD844 commercial component and sample capacitors and resistors. The experimental results have shown good agreement with both simulations and theoretical expectations.

• 出版日期2013-1