Design of low input and high output impedance current-mode biquad filter using CDTAs with independent control of quality factor and pole frequency

2013 ◽  
Author(s):  
Somsak Sattanaco ◽  
Winai Jaikla ◽  
Piya Supavarasuwat ◽  
Wipobh Jaikhang
Keyword(s):  
Quality Factor ◽  
Current Mode ◽  
Output Impedance ◽  
Independent Control ◽  
Low Input ◽  
Biquad Filter ◽  
High Output Impedance ◽  
High Output

scholarly journals A Novel Current–Mode High–Frequency Polyphase Filter using Multi–Output Current Differencing Transconductance Amplifiers

2016 ◽  
Vol 67 (5) ◽  
pp. 311-322
Author(s):  
Hao Peng ◽  
Chunhua Wang ◽  
Xiaotong Tian
Keyword(s):  
Input Impedance ◽  
Current Mode ◽  
Output Impedance ◽  
Output Current ◽  
Polyphase Filter ◽  
Low Input ◽  
Centre Frequency ◽  
Transconductance Amplifiers ◽  
High Output Impedance ◽  
High Output

Abstract This paper introduces a novel polyphase filter working at high centre frequency using multi-output current differencing transconductance amplifiers (MOCDTAs). The MOCDTA possesses characteristics of low input impedance, high output impedance, wide work frequency and linearly adjustable transconductance. The proposed filter consists of two MOCDTAs, two grounded capacitors, and no resistors. The features of low input impedance and high output impedance make it suitable for cascade. The bandwidth and centre frequency could be adjusted independently by external bias voltage VC and VCa. The image rejection ratio (IRR) could reach 31.6 dB at the centre frequency of 114 MHz, and its bandwidth could be 11.1 MHz. Besides, the centre frequency could be tuned from 38 MHz to 150 MHz with bandwidth of 20.1 MHz. Simulation results which verify the theory are included.

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.

scholarly journals Versatile Tunable Current-Mode Universal Biquadratic Filter Using MO-DVCCs and MOSFET-Based Electronic Resistors

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Hua-Pin Chen
Keyword(s):  
Current Mode ◽  
Angular Frequency ◽  
Input Current ◽  
Current Conveyors ◽  
Output Impedance ◽  
Output Circuit ◽  
Single Output ◽  
Biquadratic Filter ◽  
High Output Impedance ◽  
High Output

This paper presents a versatile tunable current-mode universal biquadratic filter with four-input and three-output employing only two multioutput differential voltage current conveyors (MO-DVCCs), two grounded capacitors, and a well-known method for replacement of three grounded resistors by MOSFET-based electronic resistors. The proposed configuration exhibits high-output impedance which is important for easy cascading in the current-mode operations. The proposed circuit can be used as either a two-input three-output circuit or a three-input single-output circuit. In the operation of two-input three-output circuit, the bandpass, highpass, and bandreject filtering responses can be realized simultaneously while the allpass filtering response can be easily obtained by connecting appropriated output current directly without using additional stages. In the operation of three-input single-output circuit, all five generic filtering functions can be easily realized by selecting different three-input current signals. The filter permits orthogonal controllability of the quality factor and resonance angular frequency, and no inverting-type input current signals are imposed. All the passive and active sensitivities are low. Postlayout simulations were carried out to verify the functionality of the design.

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