A new three-input single-output voltage-mode universal biquadratic filter with high-input impedance using only three plus-type second-generation current conveyors (CCIIs) is presented. The proposed configuration uses only two capacitors and two resistors and can realize all the standard filter functions, that is, high-pass, bandpass, low-pass, notch, and allpass filters without changing the passive elements. The proposed circuit has no requirements for component matching conditions. The use of only plus-type CCIIs simplifies the configuration.

High-input impedance voltage-mode universal biquadratic filter using three plus-type CCIIs

In this paper, using a minimum number of passive components, i.e., new grounded and floating inductance simulators, grounded capacitance multipliers, and frequency-dependent negative resistors (FDNRs) based on one/two modified current-feedback operational amplifiers (MCFOAs), are proposed. The type of the simulators depends on the passive element selection used in the structure of the circuit without requiring critical active and passive component-matching conditions and/or cancellation constraints. In order to show the flexibility of the proposed MCFOA, a single-input three-output (SITO) voltage-mode (VM) filter, two three-input single-output (TISO) VM filters, and an SITO current-mode (CM) filter employing a single MCFOA are reported. The layout of the proposed MCFOA is also given. A number of simulations using the SPICE program and some experimental tests are performed to exhibit the performance of the introduced structures.

A Modified CFOA and Its Applications to Simulated Inductors, Capacitance Multipliers, and Analog Filters

A novel first order all-pass section using a single second generation current conveyor is given. In addition the circuit uses two resistors and only one capacitor. The circuit is also realized with a translinear conveyor. The latter circuit uses only one external resistor and a capacitor. The proposed circuits are verified using PSPICE with attractive results.

Simple first order all-pass section using a single CCII

Current conveyors are unity gain active elements exhibiting high linearity, wide dynamic range and better high frequency performance compared with their voltage mode counterparts. In this study a set of single positive-type second generation current conveyor based all-pass filters is presented and a catalogue of canonical topologies is given with some properties in tabular form. In contrast with single topology presentations, 22 different topologies are presented which exhibit identical transfer functions but differ in the number of passive components, component matching constraints, possibility of gain adjustment and other properties.

All-pass filters using a single current conveyor

We present a versatile multi-input-multi-output biquad configuration. Either a three-input single-output or a single-input three-output universal filter can be realized. The proposed construction is comprised of only three current conveyors and four grounded passive elements, is multifunctional and convenient for monolithic integration, has low sensitivity, and is simple in structure. Its high impedance outputs enable easy cascading in current-mode operation. After slightly modifying an original configuration, another novel single-input three-output universal filter with extra advantageous features has been obtained. The effects of current conveyor nonidealities are discussed and simulation results are provided.

Versatile insensitive current-mode universal biquad implementation using current conveyors

A new universal voltage-mode second-order filter with three inputs and one output employing two current conveyors, two capacitors and three resistors is presented. With the same number of passive elements, the new filter employs one less current conveyor than the latest published paper. Also, the new filter does not need a voltage follower. The new circuit still offers the following advantageous features of the published filter of this category: realization of all-pass, notch, high-pass, bandpass and low-pass signals from the same configuration, no requirements for component-matching conditions, orthogonal control of ω0 and Q, low active and passive sensitivities.

Novel universal voltage-mode biquad filter with three inputs and one output using only two current conveyors

A new configuration for realising high input impedance voltage-mode filters using only plus-type current conveyors (CCII+) is presented. This configuration uses only grounded resistors and capacitors and can simultaneously realise lowpass, bandpass and highpass responses. The use of only plus-type CCIIs simplifies the configuration. PSPICE simulation results are also included.

High input impedance voltage-mode multifunction filters using plus-type CCIIs

A new voltage-mode universal biquadratic filter configuration using two secondgeneration current conveyors (CCIIs) and four passive components is presented. The proposed configuration can realize the second-order low-pass, band-pass, high-pass, notch and all-pass transfers with unity gain. Both its active and passive sensitivities are small. PSPICE simulation results are given to confirm the theoretical analysis.

New CCII-based voltage-mode universal biquadratic filter

A new configuration for realising high input impedance lowpass, bandpass and highpass filters simultaneously by using three current-feedback amplifiers, three grounded capacitors, three grounded resistors and one floating resistor is presented. The proposed circuit offers the following features: realisation of lowpass, bandpass and highpass signals from the same configuration, no requirements for component matching conditions, orthogonal control of /spl omega//sub 0/ and Q, the use of grounded capacitors, low active and passive sensitivities and low output impedance.

High input impedance voltage-mode lowpass, bandpass and highpass filter using current-feedback amplifiers

Four new single-element-controlled sinusoidal oscillator circuit using two secondgeneration current conveyors (CCIIs), two capacitors and two resistors are presented. Half of the proposed circuits have the advantage of using grounded capacitors. All proposed circuits enjoy oscillation control through a single grounded passive element(s) and independent frequency control through another single passive element(s).

Maw-Huei Lee

Papers

Novel universal voltage-mode biquad filter with three inputs and one output using only two current conveyors

High input impedance voltage-mode multifunction filters using plus-type CCIIs

New CCII-based voltage-mode universal biquadratic filter

High input impedance voltage-mode lowpass, bandpass and highpass filter using current-feedback amplifiers

Single-element-controlled sinusoidal oscillators using cciis