Low-Frequency Resistorless Electronically Tunable Quadrature Oscillator Based on an EX-CCCII

An approach for the implementation of a resistorless, electronically tunable quadrature oscillator (RETQO) is proposed in this paper. The proposed circuit consists of only one EX-CCCII block and two capacitors with a ground connection. Non-ideality analyses are performed to prove the suitability of the RETQO design. The frequency of oscillation expression is obtained. The oscillator independently controls the condition of oscillation (CO) and the frequency of oscillation (FO). The acceptability of the circuit is confirmed using CMOS-based TSMC 180-nanometer technology. Also, numerous simulations based on the SPICE circuit simulator are accomplished. Moreover, experimentation has also been tested using IC AD844 which is commercially available. There is good agreement of the proposed work with existing reports.