NEW ALL-PASS FILTER CIRCUIT COMPENSATING FOR C-CDBA NON-IDEALITIES

2010 ◽  
Vol 19 (02) ◽  
pp. 381-391 ◽  
Author(s):  
BILGIN METIN ◽  
KIRAT PAL
Keyword(s):  
Output Impedance ◽  
Pass Filter ◽  
First Order ◽  
Electronically Tunable ◽  
Theoretical Results

In this paper, a CMOS current controlled current differencing buffered amplifier (C-CDBA) realization is presented. Also, a new first-order all-pass filter that compensates for some C-CDBA non-idealities is given as an application example. The all-pass filter circuit has low output impedance for easy cascadability and it can be made electronically tunable using the proposed C-CDBA implementation. The theoretical results are verified with SPICE simulations.

scholarly journals Cascadable Current-Mode First-Order All-Pass Filter Based on Minimal Components

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Jitendra Mohan ◽  
Sudhanshu Maheshwari
Keyword(s):  
Current Mode ◽  
Current Conveyor ◽  
Cmos Process ◽  
Output Impedance ◽  
Circuit Realization ◽  
Pass Filter ◽  
First Order ◽  
High Output Impedance ◽  
Theoretical Results ◽  
High Output

A novel current-mode first-order all-pass filter with low input and high output impedance feature is presented. The circuit realization employs a single dual-X-second-generation current conveyor, one grounded capacitor, and one grounded resistor, which is a minimum component realization. The theoretical results are verified using PSPICE simulation program with TSMC 0.35 μm CMOS process parameters.

scholarly journals All-Pass Filter Based Linear Voltage Controlled Quadrature Oscillator

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Koushick Mathur ◽  
Palaniandavar Venkateswaran ◽  
Rabindranath Nandi
Keyword(s):  
Current Feedback ◽  
Pass Filter ◽  
Quadrature Oscillator ◽  
First Order ◽  
Feedback Amplifier ◽  
Current Feedback Amplifier ◽  
Control Node ◽  
Node Voltage ◽  
Electronically Tunable ◽  
Linear Voltage

A linear voltage controlled quadrature oscillator implemented from a first-order electronically tunable all-pass filter (ETAF) is presented. The active element is commercially available current feedback amplifier (AD844) in conjunction with the relatively new Multiplication Mode Current Conveyor (MMCC) device. Electronic tunability is obtained by the control node voltage (V) of the MMCC. Effects of the device nonidealities, namely, the parasitic capacitors and the roll-off poles of the port-transfer ratios of the device, are shown to be negligible, even though the usable high-frequency ranges are constrained by these imperfections. Subsequently the filter is looped with an electronically tunable integrator (ETI) to implement the quadrature oscillator (QO). Experimental responses on the voltage tunable phase of the filter and the linear-tuning law of the quadrature oscillator up to 9.9 MHz at low THD are verified by simulation and hardware tests.

CASCADABLE ALL-PASS AND NOTCH FILTER CONFIGURATIONS EMPLOYING TWO PLUS-TYPE DDCCs

2011 ◽  
Vol 20 (02) ◽  
pp. 329-347 ◽  
Author(s):  
SUDHANSHU MAHESHWARI ◽  
JITENDRA MOHAN ◽  
DURG SINGH CHAUHAN
Keyword(s):  
Input Impedance ◽  
Notch Filter ◽  
Second Order ◽  
Output Impedance ◽  
High Input ◽  
Notch Filters ◽  
High Input Impedance ◽  
Pspice Simulations ◽  
First Order ◽  
Theoretical Results

In this paper, twelve new circuit configurations for realization of first-order, second-order voltage-mode all-pass and notch filters with high input impedance and low output impedance are presented. The proposed circuit configurations use two plus type DDCCs, and two impedances. The circuits use one grounded capacitor and two grounded resistors for realizing first-order all-pass filters, and two grounded capacitors and two resistors for realizing second-order all-pass/notch filters. High input impedance and low output impedance of the configuration enable the circuits to be cascaded without additional buffers. As an application, a quadrature oscillator is realized. The theoretical results are verified with PSPICE simulations using 0.5 μm CMOS parameters.

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.

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 Design of Voltage Mode Electronically Tunable First Order All Pass Filter in ±0.7 V 16 nm CNFET Technology

Electronics ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 95 ◽  
Author(s):  
Muhammad Masud ◽  
Abu A’ain ◽  
Iqbal Khan ◽  
Nasir Husin
Keyword(s):  
Low Voltage ◽  
Wide Frequency Range ◽  
Passive Components ◽  
Pass Filter ◽  
First Order ◽  
Voltage Mode ◽  
Tunable Range ◽  
Low Voltage Operation ◽  
Unity Gain ◽  
Electronically Tunable

A novel voltage mode first order active only tuneable all pass filter (AOTAPF) circuit configuration is presented. The AOTAPF has been designed using ±0.7 V, 16 nm carbon nanotube field effect transistor (CNFET) Technology. The circuit uses CNFET based varactor and unity gain inverting amplifier (UGIA). The presented AOTAPF is realized with three N-type CNFETs and without any external passive components. It is to be noted that the realized circuit uses only two CNFETs between its supply-rails and thus, suitable for low-voltage operation. The electronic tunability is achieved by varying the voltage controlled capacitance of the employed CNFET varactor. By altering the varactor tuning voltage, a wide tunable range of pole frequency between 34.2 GHz to 56.9 GHz is achieved. The proposed circuit does not need any matching constraint and is suitable for multi-GHz frequency applications. The presented AOTAPF performance is substantiated with HSPICE simulation program for 16 nm technology-node, using the well-known Stanford CNFET model. AOTAPF simulation results verify the theory for a wide frequency-range.

scholarly journals Tunable First-Order Resistorless All-Pass Filter with Low Output Impedance

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Parveen Beg
Keyword(s):  
Building Block ◽  
Active Element ◽  
Higher Order ◽  
Current Conveyor ◽  
Passive Component ◽  
Output Impedance ◽  
Pass Filter ◽  
Mos Transistor ◽  
First Order ◽  
Voltage Mode

This paper presents a voltage mode cascadable single active element tunable first-order all-pass filter with a single passive component. The active element used to realise the filter is a new building block termed as differential difference dual-X current conveyor with a buffered output (DD-DXCCII). The filter is thus realized with the help of a DD-DXCCII, a capacitor, and a MOS transistor. By exploiting the low output impedance, a higher order filter is also realized. Nonideal and parasitic study is also carried out on the realised filters. The proposed DD-DXCCII filters are simulated using TSMC the 0.25 µm technology.

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