Narrow Results

A novel four quadrant analog multiplier (FQAM) is presented using the recently proposed active building block (ABB), namely the dual-current-controlled current differencing buffered amplifier (DCC-CDBA). The inputs to the circuit are two bipolar current signals and current and voltage outputs are available as multiplication of the input signals. The use of DCC-CDBA in four quadrant multiplier design is attractive, since the circuit structure is very simple and uses reduced number of components, viz. only one DCC-CDBA, which is constructed using two second-generation current controlled conveyors (CCCIIs). The circuit operation is current-tunable and ideally temperature insensitive. The workability of the circuit is verified using PSPICE simulations.

This paper presents a new current-mode quadrature oscillator based on a very recently proposed active building block (ABB), namely the current-controlled current conveyor transconductance amplifier (CCCCTA). The proposed circuit does not use any external resistors and uses reduced number of components to realize a quadrature oscillator- just one ABB and two grounded capacitors. The circuit offers the following advantages: (i) circuit structure is canonic and is suitable for monolithic integration, (ii) non-interactive current control of condition of oscillation (CO) and frequency of oscillation (FO) and is suitable to be used as a variable frequency oscillator (VFO) and (iii) availability of the explicit-current-outputs (ECOs). The non-ideal analysis of the circuit and its sensitivity study has been done and PSPICE simulations have been included which validate the working of the proposed circuit.