Abstract
ABSTRACT A new scheme on the realization of voltage-tunable immittance function (VTIF) is proposed. Two types of grounded- of high-quality (Q) resonant filters and voltage-controlled quadrature oscillator (VCQO) with linear tuning law are presented. Analysis indicates that the filter /QO parameters are impervious to the ABB-parasitic components. Experimental results exhibit a VCQO-linear tuning range of fo ~14MHz with a satisfactory phase-noise margin of immittances viz., inductance (L) and Frequency-Dependent Negative Resistance (D) are derived using the Current Feedback Amplifier (CFA) combined with analog voltage-multiplier elements as the active building block (ABB). Subsequently implementation of LC-bandpass and rD-band-reject selective filters, along with QO designs are presented with low THD and phase noise of (─)104 dBc/Hz at 30 KHz offset. Experimental results of the proposed circuits had been satisfactorily verified using standard commercially available IC-modules.
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