filter using a grounded capacitor

In this study, a novel first-order current-mode active-C all-pass filter based on a companding idea is proposed. In the design of the filter, a state space method is used. The proposed structure consists of only two plus-type differential difference current conveyors, nine external MOSFETs, and a single grounded capacitor. The dominant advantages of the proposed filter are briefly described as follows: offering resistorless design, consuming low power, having an electronic tunability property of its pole frequency, and not suffering from the disadvantage of any passive component matching conditions. By cascading two all-pass filters in a closed negative feedback loop, a high-Q band-pass network is designed as an application example. Several simulations including frequency domain and time domain analyses by using the PSpice program are carried out to confirm the theoretical design. All the obtained simulation results are given and discussed

Current Conveyor and Its Application

In this study, a new electronically tunable differential difference current conveyor with translinear circuit principle is proposed. A Capacitance multiplier circuit is used to show functionality of the proposed active block. The designed circuit is simulated by using PSpice program. According to the results of simulation, validation of proposed active block and applied circuit are verified

A BJT technology-based current-mode tunable all-pass filter

In this paper, a new bipolar technology-based configuration for providing inverting first-order current-mode (CM) all-pass filter response is proposed. One of the main advantages of the introduced active C topology is to have the property of electronic tunability of its pole frequency without requiring passive component matching condition. To show the performance of suggested filter, simulations are achieved by means of PSPICE program. Moreover, experimental test results are included. (C) 2009 Elsevier Ltd. All rights reserved

Capacitance Multiplier Design by Using CFOA-

In this work, capacitance multiplier is designed by using negative current feedback operational amplifier. The proposed circuit has low sensitivity to temperature variations. The simulation results are obtained by PSPICE simulations verify the theoretical analysis between 100KHz-6MHz

domain filters

By using Darlington topology, an alternative circuit is proposed to overcome the in-band gain problem for the log domain circuits. This idea is applied to a third order elliptic filter synthesized in the log domain. Simulations are performed in order to compare the performances of ideal transistors with infinite forward gain, CBIC-R transistors and CBIC-R transistors connected in Darlington topology. The AC response of the Darlington connected transistors gives better performance in terms of in-band gain. THD and noise performances are also investigated. In addition, the circuit is driven by a signal at the filter's corner frequency, i.e. f=100 kHz, for the time domain analysis. The results are discussed.C1 [Arslanalp, Remzi; Tola, Abdullah T.] Pamukkale Univ, Elekt Elekt Muhendisligi Bolumu, TR-20017 Denizli, Turkey

Current Conveyor and Its Application

In this study, a new electronically tunable differential difference current conveyor with translinear circuit principle is proposed. A Capacitance multiplier circuit is used to show functionality of the proposed active block. The designed circuit is simulated by using PSpice program. According to the results of simulation, validation of proposed active block and applied circuit are verified

Capacitance Multiplier Design by Using CFOA-

In this work, capacitance multiplier is designed by using negative current feedback operational amplifier. The proposed circuit has low sensitivity to temperature variations. The simulation results are obtained by PSPICE simulations verify the theoretical analysis between 100KHz-6MHz

A new state space representation method for adaptive log domain system

In this paper, a new method for the state space representation of a system is proposed, which is based on the companion form technique. It is very important to have almost equal coefficients of state space equations since their coefficients are proportional to devices' currents or voltages, e.g. transistors' currents for log domain filters. The method gives us the opportunity to choose two arbitrary parameters (alpha, beta) to be able to obtain more balanced state space equations. This method is applied a log domain filter, which can be considered an adaptive filter since it can be electronically tuned. It is particularly useful for higher order log domain filters synthesized in the state space.C1 [Arslanalp, Remzi; Tola, Abdullah T.] Pamukkale Univ, Dept Elect & Elect Engn, TR-20070 Kinikli, Denizli, Turkey