Universal Voltage-Mode/Current-Mode Biquad Filter Realised with Current Feedback Op-Amps

Frequenz ◽  
1997 ◽  
Vol 51 (7-8) ◽  
Author(s):  
Raj Senani ◽  
S. S. Gupta
Keyword(s):  
Current Mode ◽  
Current Feedback ◽  
Voltage Mode ◽  
Biquad Filter ◽  
Op Amps

VARIOUS CURRENT-MODE AND VOLTAGE-MODE INSTRUMENTATION AMPLIFIER TOPOLOGIES SUITABLE FOR INTEGRATION

2010 ◽  
Vol 19 (03) ◽  
pp. 689-699 ◽  
Author(s):  
ERKAN YUCE
Keyword(s):  
Integrated Circuit ◽  
Experimental Tests ◽  
Current Mode ◽  
The Other ◽  
Operational Amplifiers ◽  
Instrumentation Amplifier ◽  
Nmos Transistor ◽  
Current Feedback ◽  
Voltage Mode ◽  
Current Feedback Operational Amplifiers

In this paper, four instrumentation amplifier (IA) topologies, one of which is current-mode (CM) while the others are voltage-mode (VM), are presented. Three of the IAs use one to two current feedback operational amplifiers (CFOAs) while the other one employs only a single NMOS transistor. One of the IA circuits, given as an example, is simple while others are novel. The CM IA is composed of only grounded resistors which have some advantages in integrated circuit (IC) process. Non-ideality effects such as non-ideal gain and parasitic impedances on the performance of introduced IAs are discussed. In order to show the performance of the circuits, we perform experimental tests and simulations by using SPICE program.

scholarly journals High-Input Impedance Voltage-Mode Multifunction Filter

2021 ◽  
Vol 11 (1) ◽  
pp. 387
Author(s):  
San-Fu Wang ◽  
Hua-Pin Chen ◽  
Yitsen Ku ◽  
Yi-Fang Li
Keyword(s):  
Input Impedance ◽  
Angular Frequency ◽  
High Input ◽  
High Input Impedance ◽  
Current Feedback ◽  
Circuit Performance ◽  
Voltage Mode ◽  
Biquad Filter ◽  
Low Pass ◽  
Multifunction Filter

This paper proposes a high-input impedance voltage-mode (VM) multifunction biquad filter which employs three current-feedback amplifiers (CFAs), three resistors, and two grounded capacitors. The proposed VM multifunction biquad filter has single-input and triple-output and can realize non-inverting low-pass (NLP), inverting band-pass (IBP), and non-inverting band-stop (NBS) voltage responses at the same time without increasing component selection. The proposed VM multifunction biquad filter enjoys the orthogonal tunability of angular frequency and quality factor and also provides the advantage of using only two grounded capacitors, high-input impedance and low active/passive sensitivity. The performance of the proposed VM multifunction biquad filter is verified through its hardware implementation and OrCAD PSpice simulation based on AD844-type CFAs. The circuit analysis, sensitivity analysis, and NLP, IBP, and NBS voltage responses are also shown in this paper. The paper presents a method to effectively reduce the active and passive components, maintain good circuit performance, and reduce circuit costs.

scholarly journals Three-Input Single-Output Electronically Controllable Dual-Mode Universal Biquad Filter Using DO-CCCIIs

2007 ◽  
Vol 2007 ◽  
pp. 1-6 ◽  
Author(s):  
M. Siripruchyanun ◽  
W. Jaikla
Keyword(s):  
Integrated Circuit ◽  
Current Mode ◽  
Dual Mode ◽  
Voltage Mode ◽  
Single Output ◽  
Biquad Filter ◽  
Biquadratic Filter ◽  
Circuit Description ◽  
Electronically Controllable ◽  
The Given

This article presents a dual-mode (voltage-mode and current-mode) universal biquadratic filter performing completely standard functions: lowpass, highpass, bandpass, band-reject, and allpass functions, based on plus-type dual-output second-generation, current controlled, current conveyor (DO-CCCII+). The features of the circuit are that the bandwidth and natural frequency can be tuned electronically via the input bias currents: the circuit description is very simple, consisting of merely 2 DO-CCCIIs and 2 capacitors: the circuit can provide either the voltage-mode or current-mode filter without changing circuit topology. Additionally, each function response can be selected by suitably selecting input signals with digital method. Without any external resistors, the proposed circuit is very suitable to further develop into an integrated circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. The maximum power consumption is approximately 1.81 mW at±1.5 V supply voltages.

Current-mode and voltage-mode universal biquads using a single current-feedback amplifier

1999 ◽  
Vol 86 (8) ◽  
pp. 929-932 ◽  
Author(s):  
CHUN-LI HOU ◽  
CHIEN-CHIH HUANG ◽  
YU-SHI LAN ◽  
JENG-JER SHAW ◽  
CHUN-MING CHANG
Keyword(s):  
Current Mode ◽  
Current Feedback ◽  
Voltage Mode ◽  
Feedback Amplifier ◽  
Current Feedback Amplifier ◽  
Universal Biquads

scholarly journals Voltage-Mode Multifunction Biquad Filter and Its Application as Fully-Uncoupled Quadrature Oscillator Based on Current-Feedback Operational Amplifiers

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6681
Author(s):  
San-Fu Wang ◽  
Hua-Pin Chen ◽  
Yitsen Ku ◽  
Ming-Xiu Zhong
Keyword(s):  
Oscillation Frequency ◽  
Transfer Functions ◽  
Amplitude Ratio ◽  
Experimental Results ◽  
Control Factor ◽  
Current Feedback ◽  
Quadrature Oscillator ◽  
Voltage Mode ◽  
Biquad Filter ◽  
Oscillation Condition

This research introduces a new multifunction biquad filter based on voltage mode (VM) current-feedback operational amplifier (CFOA) and a fully uncoupled quadrature oscillator (QO) based on the proposed VM multifunction biquad filter. The proposed VM multifunction biquad filter has high impedance to the input voltage signal, and uses three CFOAs as active components, while using four resistors and two grounded capacitors as passive components. The VM CFOA-based multifunction biquad filter realizes band-reject, band-pass, and low-pass transfer functions at high-input impedance node simultaneously, which has the feature of easy cascading in VM operation without the need for additional voltage buffers. Additionally, the filter control factor parameter pole frequency (ωo) and quality factor (Q) of the proposed VM multifunction biquad filter can be independently set by varying different resistors. By slightly modifying the VM multifunction biquad filter topology, a VM fully-uncoupled QO is easily obtained. The difference from the previous VM CFOA-based multifunction biquad filter is that the proposed VM CFOA-based multifunction biquad filter can be independently controlled by the filter control factor parameters, ωo and Q. The proposed VM CFOA-based multifunction biquad filter can be transformed into a VM QO with fully-uncoupled adjustable of the oscillation condition and the oscillation frequency. The oscillation condition and the oscillation frequency can be fully-uncoupled and controlled by varying two sets of completely different resistors. The proposed VM fully-uncoupled QO solves the amplitude instability. The constant amplitude ratio of two quadrature sinusoidal waveforms can be realized when tuning FO. PSpice simulation and experimental results prove the performances of the proposed VM multifunction filter and VM fully-uncoupled QO. Simulation and experimental results confirm the theoretical analysis of the proposed circuits.

Extending voltage-mode op amps to current-mode performance

1990 ◽  
Vol 137 (2) ◽  
pp. 116 ◽  
Author(s):  
C. Toumazou ◽  
F.J. Lidgey ◽  
C.A. Makris
Keyword(s):  
Current Mode ◽  
Voltage Mode ◽  
Op Amps

DUAL FUNCTION CAPABILITY OF RECENTLY PROPOSED FOUR-CURRENT-CONVEYOR-BASED VM BIQUAD

2005 ◽  
Vol 14 (01) ◽  
pp. 51-56 ◽  
Author(s):  
VINOD KUMAR SINGH ◽  
ABDHESH K. SINGH ◽  
RAJ SENANI
Keyword(s):  
Current Mode ◽  
Current Conveyor ◽  
Dual Function ◽  
Voltage Mode ◽  
Biquad Filter

This letter shows how, by simple modifications, the four-current-conveyor (CC) voltage mode biquad filter recently proposed by Singh and Senani provides dual function capability, i.e., the same circuit also yields all the five current-mode (CM) filters.

scholarly journals Voltage/Current-Mode Multifunction Filters Using Current-Feedback Amplifiers and Grounded Capacitors

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Jiun Wei Horng ◽  
Pei-Young Chou ◽  
Jian-Yu Wu
Keyword(s):  
Current Mode ◽  
Current Feedback ◽  
Matching Conditions ◽  
Voltage Mode ◽  
Component Matching ◽  
Circuit Configuration

One configuration for realizing voltage-mode multifunction filters and another configuration for realizing current-mode multifunction filters each using two current-feedback amplifiers (CFAs) are presented. The proposed voltage-mode circuit exhibits simultaneously lowpass, bandpass, and highpass filters. The proposed current-mode circuit also exhibits simultaneously lowpass, bandpass, and highpass filters. The proposed circuits offer the following features: no requirements for component matching conditions, low active and passive sensitivities, employing only grounded capacitors, and the ability to obtain multi-function filters from the same circuit configuration.

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