Electronically tunable current-mode universal filter with three-input single-output

2010 ◽  
Author(s):  
Montree Kumngern ◽  
Usa Torteanchai ◽  
Kobchai Dejhan
Keyword(s):  
Current Mode ◽  
Universal Filter ◽  
Single Output ◽  
Electronically Tunable

scholarly journals Electronically Tunable Mixed-Mode Universal Filter Employing a Single Active Block and a Minimum Number of Passive Components

2020 ◽  
Vol 11 (1) ◽  
pp. 55
Author(s):  
Mohammad Faseehuddin ◽  
Norbert Herencsar ◽  
Musa Ali Albrni ◽  
Jahariah Sampe
Keyword(s):  
Mixed Mode ◽  
Supply Voltage ◽  
Current Mode ◽  
Output Impedance ◽  
Universal Filter ◽  
Current Output ◽  
Filter Performance ◽  
Single Output ◽  
High Output Impedance ◽  
Electronically Tunable

A recently developed active building block, namely Voltage Differencing Extra X Current Conveyor (VD-EXCCII), is employed in the design of multi input single output (MISO), electronically tunable mixed-mode universal filter. The filter provides low pass (LP), high pass (HP), band pass (BP), band reject (BR) and all pass (AP) responses in current-mode (CM), voltage-mode (VM), trans-impedance-mode (TIM) and trans-admittance-mode (TAM). The filter employs a single VD-EXCCII, three resistors and two capacitors. Additionally, a CM single input multi output (SIMO) filter can be derived from the same circuit topology by only adding current output terminals. The attractive features of the filter include: (i) the ability to operate in all four modes, (ii) the tunability of the Q factor independent of pole frequency, (iii) the low output impedance for the VM filter, (iv) the high output impedance current output for CM and TAM filters and (v) no requirement for double/negative input signals (voltage/current) for response realization. The VD-EXCCII and its layout is designed and validated in Cadence Virtuoso using 0.18 µm pdk from Silterra Malaysia with a supply voltage of ±1.25 V. The operation of the filter is examined at the 8.0844 MHz characteristic frequency. A non-ideal parasitic and sensitivity analysis is also carried out to study the effect of process and components spread on the filter performance.

scholarly journals Electronically Tunable TISO Voltage-Mode Universal Filter Using Two LT1228s

2021 ◽  
Vol 12 (1) ◽  
pp. 62-74
Author(s):  
May Phu Pwint Wai ◽  
Winai Jaikla ◽  
Surapong Siripongdee ◽  
Amornchai Chaichana ◽  
Peerawut Suwanjan
Keyword(s):  
Integrated Circuits ◽  
Harmonic Distortion ◽  
Input Voltage ◽  
Angular Frequency ◽  
Pass Band ◽  
Universal Filter ◽  
Voltage Mode ◽  
Single Output ◽  
Low Pass ◽  
Electronically Tunable

This study aims to design an electronically tunable voltage-mode (VM) universal filter utilizing commercially available LT1228 integrated circuits (ICs) with three-input and single-output (TISO) configuration. With the procedure based on two integrator loop filtering structures, the proposed filter consists of two LT1228s, four resistors, and two grounded capacitors. It realizes five filter output responses: low-pass, all-pass, band-reject, band-pass, and high-pass functions. By selecting input voltage signals, each output responses can be achieved without changing the circuit architecture. The natural angular frequency can be controlled electronically. The input voltage nodes Vin1 and Vin3 possess high impedance. The output node has low impedance, so it can be cascaded to other circuits. The performance of the proposed filter is corroborated by PSpice simulation and hardware implementation which support the theoretical assumptions. The result shows that the range of total harmonic distortion (THD) is lower than 1%, and that the higher the temperature is, the lower the natural angular frequency is.

Electronically-Tunable Current-Mode Biquad Design Using MO-OTAs

2016 ◽  
Vol 25 (09) ◽  
pp. 1650107 ◽  
Author(s):  
Ali Kircay ◽  
Selim Borekci
Keyword(s):  
Quality Factor ◽  
Current Mode ◽  
Center Frequency ◽  
Total Power ◽  
Operational Transconductance Amplifiers ◽  
Single Output ◽  
Low Pass ◽  
Band Pass ◽  
Electronically Tunable ◽  
Dc Current

In this paper, electronically-tunable, current-mode biquad is proposed by using multiple-output operational transconductance amplifiers (MO-OTAs). The proposed circuit has one input and two outputs. Without changing the circuit topology, low-pass (LP), and band-pass (BP) responses can be realized. The filter is realized by using two MO-OTAs, a single-output OTA (SO-OTA), a two-output OTA and two grounded capacitors. The biquad is designed based on first-order LP filter or lossy integrator blocks. The feedback block is applied to the filter circuit in order to obtain high quality factor values greater than 1/2. The center frequency and the quality factor of the LP and BP filters can be electronically tuned by DC current of OTAs. The total power dissipation of the proposed biquad is approximately 10[Formula: see text]mW at [Formula: see text][Formula: see text]V supplied voltage. The theoretical analysis is also confirmed with SPICE simulations.

A new electronically tunable current mode universal filter using MO-CCCII

2008 ◽  
Vol 58 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Neeta Pandey ◽  
Sajal K. Paul ◽  
Shail Bala Jain
Keyword(s):  
Current Mode ◽  
Universal Filter ◽  
Electronically Tunable

scholarly journals Universal Tunable Current-Mode Biquad Employing Distributed Feedback Structure with MO-CCCII

2010 ◽  
Vol 61 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Roman Šotner ◽  
Josef Slezák ◽  
Tomáš Dostál ◽  
Jiří Petržela
Keyword(s):  
Building Block ◽  
Current Mode ◽  
Distributed Feedback ◽  
Universal Filter ◽  
State Variable ◽  
Mode Design ◽  
Electronic Tuning ◽  
Feedback Structure ◽  
Electronically Tunable ◽  
Active Block

Universal Tunable Current-Mode Biquad Employing Distributed Feedback Structure with MO-CCCIIOne possible application of the multiple-output electronically-tunable active building block as a universal filter with distributed feedback structure is presented. The suggested structure is less conventional than the well-known state-variable Kerwin-Huelsman-Newcomb but allows the same filter configurations with the similar properties. The major current-mode design approach disadvantage,ie, the necessity of multiple current outputs, is demonstrated. To date even a rather big line of the commercially available devices do not solve this problem. Some features of the active block used for modelling and transistor-level simulation are briefly discussed. The obvious chance for electronic tuning of the proposed filter is verified.

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