Deva Nand

Single-Input Four-Output Current Mode Filter Using Operational Floating Current Conveyor

This paper presents operational floating current conveyor (OFCC) based single input four output current mode filter. It employs only three OFCCs and two grounded capacitors and resistors each. The MOS based grounded resistors implementation is used, which adds feature of electronic tunability to the filter parameters. The filter also enjoys low component spread and low sensitivity performance. The effect of finite transimpedance and parasites of OFCC on the proposed circuit is also analyzed. The functionality of the proposed circuit is demonstrated through SPICE simulations using 0.5 µm CMOS process model provided by MOSIS (AGILENT).

Generalised operational floating current conveyor based instrumentation amplifier

This paper proposes two generalised instrumentation amplifier topologies which can operate in voltage, current, transadmittance, and transimpedance mode. Each topology is a two stage structure, wherein an amplifier is used as first stage in the first topology and a converter is employed in the second one. The second stage is difference amplifier for both the structures. The theoretical proposition is verified through operational floating current conveyor (OFCC). The effect of non-idealities of OFCC on system performance, in particular finite transimpedance and tracking error, is also analysed and corresponding mathematical formulation is presented. The functional verification is performed through SPICE simulation using CMOS-based implementation of OFCC. The experimental results using current feedback operational amplifier-based OFCC implementation are also included which are in close agreement with theoretical and simulated results.

OFCC based voltage and transadmittance mode instrumentation amplifier

The operational floating current conveyor (OFCC) is a versatile active block due to the availability of both low and high input and output impedance terminals. This paper addresses the realization of OFCC based voltage and transadmittance mode instrumentation amplifiers (VMIA and TAM IA). It employs three OFCCs and seven resistors. The transadmittance mode operation can easily be obtained by simply connecting an OFCC based voltage to current converter at the output. The effect of non-idealities of OFCC, in particular finite transimpedance and tracking error, on system performance is also dealt with and corresponding mathematical expressions are derived. The functional verification is performed through SPICE simulation using CMOS based implementation of OFCC.

Transadmittance Mode First Order LP/HP/AP Filter and its Application as an Oscillator

In this paper new transadmittance mode first order low pass, high pass and all pass filter topologies using operational floating current conveyor (OFCC) is proposed and its application as an oscillator is also put forward. This proposal offers all filter functions at high impedance. Only two OFCCs, two resistors and one grounded capacitor are employed for realization. Workability is verified through SPICE simulations and results conform to the theoretical predictions very well. The proposed circuit is prototyped and tested experimentally for its application as an oscillator.

Universal biquadratic filter using Operational Floating Current Conveyor (OFCC)

A universal biquadratic filter in voltage mode (VM) and current mode (CM) configuration using single Operation Floating Current Conveyor (OFCC) is presented in this paper. It realizes all standard filter functions i.e. low pass (LP), high pass (HP), band pass (BP), notch and all pass (AP) without changing circuit topology. The proposed multi input multi output (MIMO) circuit has two inputs and two outputs and filter outputs can be obtained simultaneously without modifying circuit topology. Prototype circuit including OFCC has been realized using commercially available IC AD844 and components. Presented circuit has additional advantage of low sensitivity and low components count. Results of both modes are verified through mathematical equations, PSpice simulations and prototype.

Current-mode rectifier configuration based on OFCC

This paper presents a current-mode (CM) rectifier configuration using single operational floating current conveyor (OFCC). Additionally, the topology uses two MOS transistors operating as switches and is suitable for integration. The SPICE simulations using 0.18 μm TSMC CMOS technology parameters have been included to verify the theoretical predictions.