Current-input current-output 2nd-order all-pass filter employing two ZC-CITAs

2010 ◽  
Author(s):  
Dalibor Biolek ◽  
Viera Biolkova
Keyword(s):  
Input Current ◽  
Pass Filter ◽  
Current Output ◽  
Current Input

Cascadable and Tunable Analog Building Blocks Using EX-CCCII

2017 ◽  
Vol 26 (06) ◽  
pp. 1750093 ◽  
Author(s):  
Sudhanshu Maheshwari ◽  
Deepak Agrawal
Keyword(s):  
Supply Voltage ◽  
Building Blocks ◽  
Second Order ◽  
Input Current ◽  
Pass Filter ◽  
Current Output ◽  
First Order ◽  
Component Matching ◽  
Electronically Tunable ◽  
Matching Constraints

A new cascadable voltage-input, current-output first-order all-pass filter and its applications in second-order filter and oscillator are presented. The proposed circuit employs a single active element namely extra-X current-controlled current conveyor (EX-CCCII) and only a single grounded capacitor. The circuit exhibits high input and high output impedances, so that the filter can be cascaded without additional buffers. The pole frequency is electronically tunable and the circuit requires no component matching constraints. Effects of nonidealities and parasitics are also discussed. As applications, a second-order transadmittance (TA)-mode all-pass filter and a quadrature oscillator are also realized using the proposed voltage-input, current-output first-order all-pass filter. These examples validate easy cascading feature of the proposed circuit. The validity of the proposed circuit is verified through PSPICE simulations using 0.25[Formula: see text][Formula: see text]m parameters with a supply voltage of [Formula: see text][Formula: see text]V.

scholarly journals Multi-Function Active-Only High-Order Current-Driven Filter

2000 ◽  
Vol 23 (3) ◽  
pp. 157-161
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Husain Abdullah Alzaher
Keyword(s):  
Output Voltage ◽  
High Order ◽  
Input Current ◽  
Operational Amplifiers ◽  
Output Current ◽  
Current Output ◽  
Circuit Topology ◽  
Operational Transconductance Amplifiers ◽  
Order Filter ◽  
Transconductance Amplifiers

A new multi-function high-order current-driven filter is proposed. The filter uses only operational amplifiers, and operational transconductance amplifiers (OTAs). Without using any external passive elements, a variety of high-order input-current/output-current and/or input-current/output-voltage responses can be realised without changing the circuit topology and without any matching or cancellation conditions. The parameters of the high-order filter responses can be electronically tuned by adjusting the bias currents of the OTAs.

scholarly journals Role of slow temporal dynamics in reliable activity of stochastically driven neurons

2020 ◽  
Author(s):  
Subhadra Mokashe ◽  
Suhita Nadkarni
Keyword(s):  
Temporal Dynamics ◽  
Network Motif ◽  
Neuronal Firing ◽  
Input Current ◽  
Switching Frequency ◽  
Quiescent State ◽  
Extrinsic Noise ◽  
Gabaergic Synapse ◽  
Pass Filter ◽  
Low Pass Filter

ABSTRACTNeuronal networks maintain robust patterns of activity despite a backdrop of noise from various sources. Mutually inhibiting neurons is a standard network motif implicated in rhythm generation. In an elementary network motif of two neurons capable of swapping from an active state to a quiescent state, we ask how different sources of stochasticity alter firing patterns. In this system, the alternating activity occurs via combined action of a calcium-dependent potassium current, sAHP (slow afterhyperpolarization), and a fast GABAergic synapse. We show that simulating extrinsic noise arising from background activity extends the dynamical range of neuronal firing. Extrinsic noise also has the effect of increasing the switching frequency via a faster build-up of sAHP current. We show that switching frequency as a function of input current has a non-monotonic behavior. Interestingly the noise tolerance of this system varies with the input current. It shows maximum robustness to noise at an input current that corresponds to the minimum switching frequency between the neurons. The slow decay time scale of sAHP conductance allows neurons to act as a low-pass filter, attenuate noise, and integrate over ion channel fluctuations. Additionally, we show that the slow inactivation time of the sAHP channel allows the neuron to act as an action potential counter. We propose that this intrinsic property of the current allows the network to maintain rhythmic activity critical for various functions, despite the noise, and operate as a temporal integrator.

Electronically Tunable Mixed Mode Quadrature Oscillator Using DX-MOCCII

2020 ◽  
pp. 2150006
Author(s):  
Ashok Kumar ◽  
Ajay Kumar Kushwaha ◽  
Sajal K. Paul
Keyword(s):  
Current Conveyors ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Current Output ◽  
Quadrature Oscillator ◽  
Three Phase ◽  
Condition Of Oscillation ◽  
Noise Frequency ◽  
Band Pass ◽  
Electronically Tunable

A new electronically tunable quadrature oscillator is presented using a biquad band pass filter. The new band pass filter is designed using two dual X second-generation multi-output current conveyors (DX-MOCCIIs), two grounded capacitors, two grounded resistors and one NMOS transistor working in the triode region. It is used to design a four-phase voltage and three-phase current output quadrature oscillator simultaneously. The frequency of the oscillator can be tuned externally through the MOS gate voltage without affecting the condition of oscillation. The phase noise, frequency stability and nonideality analysis are given. The functionality of the oscillator circuit has been confirmed by SPICE simulation and also hardware realization using commercially available IC AD844.

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