Current-mode resistorless sinusoidal oscillators and a dual-phase square-wave generator using current-controlled current-differencing transconductance amplifiers and grounded capacitors

摘要

In this paper, two new designs for current-mode (CM) resistorless sinusoidal oscillators based on current-controlled current-differencing transconductance amplifiers (CCCDTAs) are presented. Each of the proposed oscillators employs a single CCCDTA along with two grounded capacitors, and the oscillation condition and frequency can be orthogonally controlled using the bias currents of the CCCDTA. This paper also presents a CCCDTA-based CM resistorless dual-phase square-wave generator derived from the proposed oscillator. This paper first presents a literature review of previous designs and then describes the applied CCCDTA as well as the relevant formulations of the proposed circuits followed by non-ideal problems, sensitivity analyses, and computer simulation examples and results. Simulation tests of the proposed circuits were conducted using the HSPICE program. Simulation results confirmed the theoretical analyses and validated the proposed circuits.