A linear voltage controlled quadrature oscillator implementation using VCII

Abstract

Realisation scheme of a linear voltage controlled quadrature oscillator (LVCQO) using the new second generation voltage conveyor (VCII) is proposed. The topology utilizes a pair of matched analog multiplier devices coupled appropriately with the VCII, as the active building block (ABB). The oscillation frequency ( f o ) is linearly tunable by the multiplier control voltage (V); experimental verification exhibits a linear tuning-range upto f o ∼10 MHz with measured THD∼2% with satisfactory phase-noise figure.

Reconfigurable Voltage-Mode First-Order Multifunction Filter Employing Second-Generation Voltage Conveyor (VCII) With Complete Standard Functions and Electronically Controllable Modification

“…It is obvious that a new active building block with low-impedance voltage output capability is useful for many analog signal processing applications like analog filters, inverse filters, and sinusoidal oscillators, etc. Second-generation voltage conveyor (VCII) is a versatile block [8], [9], [10], which is the dual of CCII, and it has been used for applications [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31] requiring lowimpedance voltage output. This new ABB has an advantage over CCII and previous current-mode ABBs since it can process signals in the current domain and output signals in both voltage and current.…”