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Selective Filters and Tunable Sinusoid Oscillator Using a CDBA

Circuits and Systems 2013年第2期4卷 227-232页

作者： Rabindranath Nandi Palaniandavar Venkateswaran Sagarika Das B. P. Poddar Institute of Management & Technology Kolkata India Department of Electronics & Telecommunication Engineering Jadavpur University Kolkata India

The realization of some new selective filters using single current differencing buffered amplifier (CDBA) and few RC components is presented. The same topology provides lowpass (LP), bandpass (BP) and highpass (HP) characteristics with appropriate choice and location of the RC components in the circuit. Incorporation of a suitable feedback loop through a voltage buffer unity-gain cell yields a tunable sinusoid oscillator. Effects of the device port mismatch errors (ε) and parasitic z-node capacitance (Cz) of the CDBA element are shown to be insignificant and corresponding sensitivities are extremely low. Satisfactory experimental verifications of the filter quality (Q) and oscillator tuning range (500 KHz ≤ fo ≤ 5 MHz) are carried out.