VERSATILE TRANSADMITTANCE-MODE OTA-C UNIVERSAL BIQUAD FILTER USING MINIMUM COMPONENTS WITH INDEPENDENTLY ELECTRONIC TUNABILITY

2014 ◽  
Vol 23 (07) ◽  
pp. 1450102 ◽  
Author(s):  
CHEN-NONG LEE
Keyword(s):  
Pass Band ◽  
Cmos Process ◽  
Process Technology ◽  
Filter Function ◽  
Matching Conditions ◽  
Control Factors ◽  
Biquad Filter ◽  
Theoretical Predictions ◽  
Low Pass ◽  
Passive Sensitivity

This paper presents a transadmittance-mode (TAM) universal biquad filter with independently electronic tunability. The proposed biquad filter only employs three operational transconductance amplifiers (OTAs) and two grounded capacitors which are the minimum components count necessary for realizing independently electronic tunability of the parameters ω0 and ω0/Q without the need of control factors matching conditions. Moreover, the proposed circuit still achieves nearly all of the main advantages: (i) simultaneous realizations of universal filtering responses (low-pass, high-pass, band-pass, band-reject and all-pass) from the same topology, (ii) versatile input/output functions, (iii) orthogonally electronic tunability of the parameters ω0 and Q without the need of control factors matching conditions, (iv) no need of any resistors, (v) cascadable feature for all input and output terminals, (vi) no need of extra inverting or non-inverting amplifiers, (vii) the employment of only grounded capacitors, (viii) no component-value constraints (except for allpass filter function) and (ix) low active and passive sensitivity performances. H-spice simulations with TSMC 0.35 μm 2P4M CMOS process technology validate theoretical predictions.

Mixed-Mode Universal Biquadratic Filter with No Need of Matching Conditions

2016 ◽  
Vol 25 (09) ◽  
pp. 1650106 ◽  
Author(s):  
Chen-Nong Lee
Keyword(s):  
Mixed Mode ◽  
Current Mode ◽  
Cmos Process ◽  
Current Conveyors ◽  
Process Technology ◽  
Matching Conditions ◽  
Fully Differential ◽  
Control Factors ◽  
Biquadratic Filter ◽  
Component Matching

None of the previously reported mixed-mode universal filters can achieve the following important advantage: no need of component matching conditions. This paper presents a new mixed-mode (including voltage, current, transadmittance, and transimpedance modes) universal biquadratic filter with no need of matching conditions (including no need of component matching and no need of input matching conditions). The proposed filter structure with nine outputs employs two plus-type fully differential current conveyors (P-type FDCCIIs), two grounded capacitors, four grounded resistors and one floating/grounded resistor, which can realize voltage, current, transadmittance, and transimpedance modes universal filtering responses (lowpass, highpass, bandpass, notch, and allpass) from the same topology without matching conditions. Moreover, the proposed circuit still offers many important advantages: the employment of two grounded capacitors, the simultaneous realizations of a lot of filtering functions, using only grounded resistors as the control factors of all filter parameters and gains, having controllable gains in current and transimpedance modes without disturbing filter parameters [Formula: see text], [Formula: see text]/Q, and Q, cascadably connecting the former voltage-mode (VM) stage and the latter current-mode (CM) stage, no capacitors bringing extra poles degrading high-frequency performance, and low active and passive sensitivity performances. H-spice simulations with TSMC 0.18[Formula: see text][Formula: see text]m 1[Formula: see text]P6M CMOS process technology validate theoretical predictions.

Design and Simulation of Switched Capacitor Filter for Speed Change Parameter Converter

2013 ◽  
Vol 562-565 ◽  
pp. 1132-1136
Author(s):  
Xiao Wei Liu ◽  
Jian Yang ◽  
Song Chen ◽  
Liang Liu ◽  
Rui Zhang ◽  
...  
Keyword(s):  
Stop Band ◽  
Cutoff Frequency ◽  
Rapid Change ◽  
Pass Band ◽  
Cmos Process ◽  
Switched Capacitor ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
The Time Domain

In this paper, we design a high-order switched capacitor filter for rapid change parameter converter. This design uses a structure which consists of three biquads filter sub-units. The design is a 6th-order SC elliptic low-pass filter, and the sample frequency is 250 kHz. By the MATLAB Simulink simulation, the system can meet the design requirements in the time domain. In this paper, the 6th-order switched capacitor elliptic low-pass filter was implemented under 0.5 um CMOS process and simulated in Cadence. The final simulation results show that the pass-band cutoff frequency is 10 kHz, and the maximum pass-band ripple is about 0.106 dB. The stop-band cutoff frequency is 20 kHz, and the minimum stop-band attenuation is 74.78 dB.

Programmable Universal Filters Using Current Conveyor Transconductance Amplifiers

2017 ◽  
Vol 26 (07) ◽  
pp. 1750121 ◽  
Author(s):  
Thanat Nonthaputha ◽  
Montree Kumngern
Keyword(s):  
Transfer Functions ◽  
Current Mode ◽  
Current Conveyor ◽  
Pass Band ◽  
Cmos Process ◽  
Low Pass ◽  
Band Pass ◽  
Transconductance Amplifiers ◽  
Biquadratic Filters ◽  
High Pass

This paper presents new programmable universal biquadratic filters using current conveyor transconductance amplifiers (CCTAs) by which both voltage- and current-mode filters can be obtained. The proposed filters use second-generation current conveyor (CCII) which is the first stage of CCTA to operate as current conveyor analog switch (CCAS) and this CCAS will be used to program the filtering functions such as low-pass, high-pass, band-pass, band-stop and all-pass filters. Unlike previous universal filters, the filtering functions of the proposed filters can be programmed using the bias currents of CCTAs without changing any input and output connections. The natural frequency and quality factor of all filtering functions can be controlled electronically and orthogonally using the bias currents of transconductance amplifiers. Also gain response of all transfer functions can be adjusted. The active and passive sensitivities of the filters are low. The proposed programmable filters have been simulated using 0.18[Formula: see text][Formula: see text]m CMOS process from TSMC. PSPICE simulation results are included to confirm workability of the proposed circuits.

scholarly journals A New CMOS Controllable Impedance Multiplier with Large Multiplication Factor

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Munir A. Al-Absi
Keyword(s):  
Cmos Technology ◽  
Cmos Process ◽  
Multiplication Factor ◽  
Process Technology ◽  
Subthreshold Region ◽  
Low Pass ◽  
Simulation Results ◽  
High Pass

This paper presents a new compact controllable impedance multiplier using CMOS technology. The design is based on the use of the translinear principle using MOSFETs in subthreshold region. The value of the impedance will be controlled using the bias currents only. The impedance can be scaled up and down as required. The functionality of the proposed design was confirmed by simulation using BSIM3V3 MOS model in Tanner Tspice 0.18 μm TSMC CMOS process technology. Simulation results indicate that the proposed design is functioning properly with a tunable multiplication factor from 0.1- to 100-fold. Applications of the proposed multiplier in the design of low pass and high pass filters are also included.

A Voltage-Mode Universal Biquadratic Filter Using DDCCTA

2016 ◽  
Vol 25 (05) ◽  
pp. 1650034 ◽  
Author(s):  
Punnavich Phatsornsiri ◽  
Montree Kumngern ◽  
Panit Lamun
Keyword(s):  
Angular Frequency ◽  
Current Conveyor ◽  
Cmos Process ◽  
Passive Component ◽  
Voltage Mode ◽  
Transconductance Amplifier ◽  
Theoretical Predictions ◽  
Low Pass ◽  
Biquadratic Filter ◽  
Component Matching

This paper presents a new voltage-mode (VM) universal biquadratic filter using differential difference current conveyor transconductance amplifier (DDCCTA) as an active element. The circuit employs one DDCCTA, two floating resistors and two floating capacitors which can realize five biquadratic filters, namely low-pass (LP), band-pass (BP), band-stop (BS), high-pass (HP) and all-pass (AP) into one single topology. For realizing these filtering functions, passive component-matching conditions, inverting-type and/or doubling-input signal requirements and changing circuit configuration are absent. The natural angular frequency and quality factor of the filter can be orthogonally controlled deliberately. The VM biquadratic filter using grounded passive components with high-input and low-output impedances can be obtained by adding an additional DDCCTA or differential difference current conveyor (DDCC). The simulation results with 0.5[Formula: see text][Formula: see text]m CMOS process from MIETEC are given to confirm the theoretical predictions and the experimental results are also included to verify the workability of the proposed structure.

scholarly journals Filter function synthesis by Gegenbauer generating function

2006 ◽  
Vol 3 (1) ◽  
pp. 55-62
Author(s):  
Vlastimir Pavlovic
Keyword(s):  
Generating Functions ◽  
Free Parameter ◽  
Transfer Functions ◽  
Pass Band ◽  
Filter Function ◽  
Temperature Changes ◽  
New Class ◽  
Good Shape ◽  
Low Pass ◽  
Amplitude Characteristics

Low-pass all-pole transfer functions with non-monotonic amplitude characteristic in the pass-band and at least (n -1) flatness conditions for ? = 0 are considered in this paper. A new class of filters in explicit form with one free parameter is obtained by applying generating functions of Gegenbauer polynomials. This class of filters has good selectivity and good shape of amplitude characteristics in the pass-band. The amplitude characteristics of these transfer functions have gain in the upper part of pass-band with respect to the gain for ? = 0. This way we have greater margin of attenuation in the upper part of the pass-band. This means a greater tolerance of elements or for elements with given tolerances, greater ambient temperature changes. The appropriate choice of the free parameter enables us to generate filter functions obtained with Chebyshev polynomials of the first and second kind and Legendre polynomials.

VERSATILE VOLTAGE-MODE DDCC-BASED UNIVERSAL FILTER

2011 ◽  
Vol 20 (04) ◽  
pp. 681-696 ◽  
Author(s):  
HUA-PIN CHEN
Keyword(s):  
Angular Frequency ◽  
Pass Band ◽  
Current Conveyors ◽  
Voltage Mode ◽  
Input Signals ◽  
Low Pass ◽  
Single Input ◽  
Band Pass ◽  
Passive Sensitivity ◽  
Quality Factor Q

A novel versatile three-input five-output universal voltage-mode filter employing two differential difference current conveyors, two grounded capacitors and three resistors is proposed. The proposed configuration can be used as either a single-input five-output or three-input two-output. Unlike the previously reported works, it can simultaneously realize five different generic signals: low-pass, band-pass, high-pass, notch and all-pass. Moreover, the proposed circuit still offers the following advantages: (i) the employment of two grounded capacitors, (ii) no need to employ inverting-type input signals, (iii) no need to impose component choice, (iv) orthogonal control of the resonance angular frequency ωo and the quality factor Q and (v) low active and passive sensitivity performances.

Mixed-Mode Universal Biquad Filter Using OTAs

2019 ◽  
Vol 29 (10) ◽  
pp. 2050162 ◽  
Author(s):  
Data R. Bhaskar ◽  
Ajishek Raj ◽  
Pragati Kumar
Keyword(s):  
Integrated Circuit ◽  
Mixed Mode ◽  
Current Mode ◽  
Cmos Process ◽  
Design Environment ◽  
Single Output ◽  
Biquad Filter ◽  
Low Pass ◽  
Band Pass ◽  
Electronically Tunable

This paper introduces an electronically tunable mixed-mode universal biquad filter configuration employing four single output operational transconductance amplifiers (OTAs), one dual output OTA and two grounded capacitors (GCs) (ideal for integrated circuit implementation and absorbing shunt parasitic capacitances). The presented structure can realize all second-order filter functions, namely, low pass (LP), high pass (HP), band pass (BP), band reject (BR) and all pass (AP) responses in voltage mode (VM), current mode (CM), transresistance mode (TRM) and transconductance mode (TCM) using appropriate selection(s) of input signals. The cut-off frequency ([Formula: see text] and bandwidth (BW) of the realized filters can be tuned orthogonally through the transconductance (by varying the bias currents) of the OTAs. The proposed biquad configuration enjoys low active and passive sensitivities. The workability of this multifunctional biquad filter topology has been confirmed through simulations using MATLAB and Analog Design Environment (ADE) spectre tool provided by Cadence Virtuoso, using 0.18[Formula: see text][Formula: see text]m CMOS process parameter. The post-layout simulations have also been carried out to validate the theory.

A Low-Power Mixed-Mode SIMO Universal Gm–C Filter

2017 ◽  
Vol 26 (10) ◽  
pp. 1750164 ◽  
Author(s):  
Mostafa Parvizi ◽  
Abouzar Taghizadeh ◽  
Hamid Mahmoodian ◽  
Ziaadin Daei Kozehkanani
Keyword(s):  
Integrated Circuit ◽  
Mixed Mode ◽  
Current Mode ◽  
Cmos Technology ◽  
Pass Band ◽  
Subthreshold Region ◽  
Fully Differential ◽  
Input Multiple Output ◽  
Low Pass ◽  
Passive Sensitivity

This paper describes a new single-input multiple-output (SIMO) mixed-mode universal biquad [Formula: see text]–[Formula: see text] filter. It can realize all kinds of filter responses including high-pass, band-pass, low-pass, band-stop and all-pass filters, simultaneously. Moreover, in this structure, all of these filters in all states of voltage mode, current mode, transresistance mode and transconductance mode are achieved by the same topology without any convertor. The proposed filter employs three operational transconductance amplifiers (OTAs) with four inputs and one output, three fully differential OTAs and two grounded capacitors. In other words, this filter is composed of six [Formula: see text] blocks and two grounded capacitors. The grounded capacitors are suitable for integrated circuit implementation. In order to reduce the power consumption, the OTAs are biased in subthreshold region. In addition, sensitivity analysis is included to show the low active and passive sensitivity performances of the filter. This filter is designed and simulated in HSPICE with 0.18[Formula: see text][Formula: see text]m model CMOS technology parameters. The simulation results show that the filter consumes only 75[Formula: see text][Formula: see text]W and operates at 1.5[Formula: see text]MHz with [Formula: see text]0.5[Formula: see text]V supply voltages and capacitors [Formula: see text][Formula: see text]pF.

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