An Active-C Current-Mode Universal First-Order Filter and Oscillator

2019 ◽  
Vol 28 (13) ◽  
pp. 1950219 ◽  
Author(s):  
D. Agrawal ◽  
S. Maheshwari
Keyword(s):  
Transfer Functions ◽  
Current Mode ◽  
Cmos Technology ◽  
Monte Carlo Analysis ◽  
Passive Element ◽  
First Order ◽  
Order Filter ◽  
Sinusoidal Oscillator ◽  
High Output Impedance ◽  
Electronically Tunable

This paper presents an electronically tunable current-mode first-order universal filter. The proposed circuit employs only a single Extra-X Current-Controlled Conveyor (EX-CCCII) and a single grounded capacitor, which is suitable for IC implementation. The circuit can realize three current transfer functions simultaneously, namely low-pass, high-pass and all-pass. The proposed circuit exhibits low-input and high-output impedance, which is suitable for cascading. The pole frequency of the filter can be electronically tuned, by varying the bias current of EX-CCCII. The nonidealities and parasitic effects on the circuit performance are investigated in detail. Also, the Monte Carlo analysis is done to show the effect of active and passive element mismatches on the pole frequency. An eight-phase current-mode sinusoidal oscillator and current-mode second-order filter are further realized using the proposed circuit. The functionality of the proposed circuits is verified through PSPICE simulations, using 0.25-[Formula: see text]m TSMC CMOS technology parameters.

High Output Impedance Current-Mode Universal First-Order Filter With Three Inputs Using One DDCC

2019 ◽  
Vol 12 (3) ◽  
pp. 242-246 ◽  
Author(s):  
Jiun-Wei Horng
Keyword(s):  
Transfer Functions ◽  
Current Mode ◽  
Output Impedance ◽  
Filter Function ◽  
First Order ◽  
Output Terminal ◽  
Order Filter ◽  
High Output Impedance ◽  
A Current ◽  
High Output

Background: A current-mode universal first-order filter with three input terminals and one output terminal is presented. Methods: The proposed circuit uses one differential difference current conveyor (DDCC), one grounded capacitor and two resistors. Results: This circuit offers the following advantageous features: high output impedance, employing only one active component, using a grounded capacitor, the versatility to synthesize any type of first-order filter transfer functions. Conclusion: Each standard first-order filter function can be obtained by using only one current input signal from the proposed circuit.

CMOS FIRST-ORDER CURRENT-MODE ALL-PASS FILTER WITH ELECTRONIC TUNING CAPABILITY AND ITS APPLICATIONS

2013 ◽  
Vol 22 (03) ◽  
pp. 1350007 ◽  
Author(s):  
LEILA SAFARI ◽  
SHAHRAM MINAEI ◽  
ERKAN YUCE
Keyword(s):  
Integrated Circuit ◽  
Low Voltage ◽  
Current Mode ◽  
Passive Component ◽  
Pass Filter ◽  
First Order ◽  
Sinusoidal Oscillator ◽  
Minimum Number ◽  
Component Matching ◽  
Electronically Tunable

In this paper, a novel first-order current-mode (CM) electronically tunable all-pass filter including one grounded capacitor and two dual-output current followers (DO-CFs) is presented. The used DO-CFs are implemented using only 10 MOS transistors granting the proposed CM all-pass filter extremely simple structure. The proposed filter is suitable for integrated circuit (IC) fabrication because it employs only a grounded capacitor and is free from passive component matching conditions. Interestingly the introduced configuration uses minimum number of components compared to other works. It also offers other interesting advantages such as, alleviating all disadvantages associated with the use of resistors, easy cascadability and satisfies all technology requirements such as small sizing, simple realization, low voltage and low power operation. Additionally, the circuit parameters can be easily set by adjusting control voltages. Most favorably, the proposed CM all-pass filter can be simply used as a voltage-mode (VM) all-pass filter with outstanding properties of adjustable gain and tunability. To further show the versatility of the proposed structure a sinusoidal oscillator is also derived from presented CM all-pass filter. Nonideal gain and parasitic impedance effects on developed CM filter are discussed. Finally, simulation results with SPICE program are included to confirm the theory.

A DVCC-Based Current-Mode First-Order Universal Filter

2021 ◽  
pp. 2150305
Author(s):  
Firat Yucel
Keyword(s):  
Integrated Circuit ◽  
Current Mode ◽  
Current Conveyors ◽  
Circuit Realization ◽  
Passive Element ◽  
Pass Filter ◽  
Typical Application ◽  
First Order ◽  
Low Pass ◽  
High Output Impedance

A current-mode first-order filter configuration simultaneously providing noninverting and inverting low-pass (LP) and high-pass (HP) responses depending on passive element choice is proposed. In addition, all-pass filter (APF) responses can be easily obtained with interconnection of LP and HP output currents. The proposed filter employs only two differential voltage current conveyors, a grounded resistor and a grounded capacitor, so it is suitable for integrated circuit realization. It provides the feature of high output impedance. It does not need any passive element matching constraints. A voltage-mode oscillator based on the inverting APF is presented as a typical application. The performance of the proposed configuration is verified through many SPICE simulation and experimental test results.

scholarly journals A Current Mode Universal Filter and a Single Resistance Controlled Oscillator Employing only Grounded Passive Elements: Applications of VDCC

2021 ◽  
Vol 25 (2) ◽  
pp. 65-76
Author(s):  
Tajinder Singh Arora ◽  
Keyword(s):  
Integrated Circuit ◽  
Current Mode ◽  
Paper Analysis ◽  
Current Conveyor ◽  
Universal Filter ◽  
Dual Mode ◽  
Passive Element ◽  
Research Article ◽  
Sinusoidal Oscillator ◽  
A Current

This research article explores the possible applications of voltage differencing current conveyor (VDCC), as a current mode universal filter and a sinusoidal oscillator. Without the need for an additional active/passive element, a very simple hardware modification makes it a dual-mode quadrature oscillator from the filter configuration. Both the proposed circuit requires only two VDCC and all grounded passive elements, hence a preferable choice for integration. The filter has some desirable features such as availability of all five explicit outputs, independent tunability of filter parameters. Availability of explicit quadrature current outputs, independence in start and frequency of oscillations, makes it a better oscillator design. Apart from prevalent CMOS simulation results, VDCC is also realized and experimentally tested using the off-the-shelf integrated circuit. All the pen and paper analysis such as non-ideal, sensitivity and parasitic analysis supports the design.

Improved Electronically-Tunable Current-Mode Square-Root-Domain First-Order Multifunction Filter

2021 ◽  
pp. 2150190
Author(s):  
Manoj Kumar Jain
Keyword(s):  
Transient Response ◽  
Current Mode ◽  
Square Root ◽  
Spice Simulation ◽  
First Order ◽  
Low Pass ◽  
Multifunction Filter ◽  
Simulation Results ◽  
Electronically Tunable ◽  
High Pass

Some time back, Kircay reported an electronically-tunable current-mode square-root-domain first-order filter capable of realizing low-pass (LP), high-pass (HP) and all-pass (AP) filter functions. When simulated in SPICE, Kircay’s circuit has been found to exhibit DC offsets in case of LP and AP responses and incorrect transient response in case of HP response. In this paper, an improved circuit overcoming these difficulties/deficiencies has been suggested and its workability of the improved circuit as well as its capability in meeting the intended objectives has been demonstrated by SPICE simulation results.

High output impedance current-mode first-order allpass networks with four grounded components and two CCIIs

2006 ◽  
Vol 93 (9) ◽  
pp. 613-621 ◽  
Author(s):  
J.-W. Horng ◽  
C.-L. Hou ◽  
C.-M. Chang ◽  
W.-Y. Chung ◽  
H.-L. Liu ◽  
...  
Keyword(s):  
Current Mode ◽  
Output Impedance ◽  
First Order ◽  
High Output Impedance ◽  
High Output

GROUNDED CAPACITOR CM-APS WITH HIGH OUTPUT IMPEDANCE

2007 ◽  
Vol 16 (04) ◽  
pp. 567-576 ◽  
Author(s):  
SUDHANSHU MAHESHWARI
Keyword(s):  
Current Mode ◽  
Bias Current ◽  
Output Impedance ◽  
Quadrature Oscillator ◽  
Pspice Simulations ◽  
First Order ◽  
External Bias ◽  
High Output Impedance ◽  
High Output

This paper presents a new first order current mode all-pass section (CM-APS) with a grounded capacitor and employing a modified current controlled conveyor. The new circuit with high output impedance is ideal for current-mode cascading and is tunable through an external bias current. The proposed circuit is unique due to its features, not exhibited by any of the available works on the topic. An application of the circuit in realizing a quadrature oscillator is also given. The theory is validated through PSPICE simulations using real device transistors.

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