Investigation of band-stop to all pass reconfigurable filter

Adoum, Bakhit Amine; Wen, Wong Peng

doi:10.1109/icias.2012.6306185

Cited by 15 publications

(12 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to see conceptual differences, typical solutions using lumped elements as well as microwave approaches are compared in Table I. The analysis of solutions, presented in Table I, leads to the following conclusions: a) resonators are not frequently used for design of reconfigurable filters in standard lumped elements-based approaches (it is a significant domain of microwave circuits) [3]- [6]; b) the highest degree of reconfigurability of the filter requires a complex circuitry and multiparameter adjustable active elements [5], [6]; c) the adjustment of the order reconfiguration influences the slope between pass and stop band, without change of the transfer type [5]; d) the number of available transfer responses in microwave resonator based approaches is either quite low [7], [8], [10] or does not include band-pass (BP) response (it is the most frequently used response in many applications) [7], [8]; e) the adjustment of microwave filters has not electronic character [7]- [9], only several cases include some electronic adjustment employing variable capacity of diode (varicap) by bias voltage [10], [11]; f) transfer responses of special character (untypical behavior magnitude and phase responses) together with simple amplification (simultaneously) are not available and studied.…”

Section: A Reconfigurable Filtersmentioning

confidence: 99%

Electronically Reconfigurable and Tunable Fractional-Order Filter Using Resonator Concept and Feedforward Path for Low-Frequency Tone Signalization

Domansky

Šotner²,

Langhammer

et al. 2021

IEEE Access

View full text Add to dashboard Cite

A novel electronically reconfigurable fractional-order filter allowing independent electronic frequency tuning and switchless change of the transfer response by a single parameter between standard bandpass, inverting all-pass response and special type band-reject response is presented in this work. The differences between these special transfer characteristics and standard features consist in magnitude and phase response behavior. Inverting amplification or attenuation is also available. The filter has tested frequency range between 1 Hz and 100 kHz. The proposed fractional-order filter (using two fractional-order element having equivalent capacity 8.7 uF/sec^1/4, α = 3/4) tunability yields one-decade range approximately between 10 Hz and 100 Hz by transconductance between 0.19 and 1.1 mS (fractional-order design helps with reduction of driving force less than one decade). The application example in frequency/phase detector (operationability around center frequency 100 Hz -between 50 and 180 Hz) and further signaling frequency detecting system for frequency shift keying demodulator offers maximal detectable voltage (about 300 mV) for alignment (zero phase shift) of the signals of the same frequency (center frequency of the proposed filter in inverting all-pass mode). It also offers an interesting application in frequency shift keying demodulation process (or for identification/signalization purposes of certain frequencies) by usage of a simple additional comparator generating clear output state. Cadence simulations as well as experimental tests using integrated cells of special multipliers fabricated in ON Semiconductor 0.35 μm I3T25 CMOS process confirm operationability of the proposed concept as well as simple application of special response of the filter for phase/frequency detection and demodulation purposes.

show abstract

Section: A Reconfigurable Filtersmentioning

confidence: 99%

Electronically Reconfigurable and Tunable Fractional-Order Filter Using Resonator Concept and Feedforward Path for Low-Frequency Tone Signalization

Domansky

Šotner²,

Langhammer

et al. 2021

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Many papers present the filters referred to as reconfigurable [11], [12] but in point-of-view of adjustability of bandwidth or quality factor (in the case of band-pass response). From our point of view, reconfigurable filter [13], [14] represents the type of transfer function where reconfigurability is available without any reconnection in the structure.…”

Section: A Reconfigurability Of the Transfer Functionmentioning

confidence: 99%

Reconnection-less Electronically Reconfigurable Filter with Adjustable Gain Using Voltage Differencing Current Conveyor

Jeřábek¹,

Šotner²,

Polák³

et al. 2016

ElAEE

View full text Add to dashboard Cite

This paper presents a novel reconnection-less and electronically reconfigurable analogue filter. It employs two active elements, Voltage-Differencing Current Conveyor (VDCC) and Dual-Output Current Amplifier (DO-CA) with two independently tunable gains. Filter has the single input and single output topology (SISO). The current-mode transfer function of the filter can be tuned electronically from the lowpass (LP) response to the high-pass (HP) response, via the band-stop (BS) response, without reconnection of the input or output terminal. It is designed in order to provide tuning of both the stop-band gain and also pass-band gain of all the transfer functions, because also transfer functions with additional and intended zero in transfer function are available. The theoretical presumptions are confirmed by both simulations and lab measurements with available devices.

show abstract

“…The most general form is multiple input multiple output (MIMO) [10] type, usually with many input or output terminals. When a filter is universal [11][12], each of five standard transfer functions (low pass, high pass, band pass, band reject and all pass) is available from the same topology by proper selection of input, output or by reconfiguration in case of reconfigurable filters [13][14]. A filter is adjustable or tunable if one or more of its parameters (angular frequency, quality factor, bandwidth, pass-band or stop-band gain) are controllable and their control must be mutually independent [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Dual-parameter control of the pole frequency in case of universal filter with MCDU elements

Jeřábek

Šotner

Herencsár

et al. 2016

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

This paper presents an universal filter with control of the pole frequency by two mutually independent parameterscurrent gain (B) and intrinsic resistance (RX) in frame of two MCDU active elements. This type of control extend and also improve features of the tuning range and is referred to as dual-parameter control. The current-mode filter is of the second order and the required type of the response (low pass, inverting band pass, high pass, band reject and all pass) is obtained by proper selection/combination of input(s)this filter is of the multiple-input single-output type (MISO). The filter employs two capacitors, two modified current differencing units (MCDUs), each of them with four controllable parameters and one multiple-output current follower (MO-CF). The paper includes tuning range analysis, the simulation results with behavioral models and also laboratory measurement results with the same models. Moreover, designed transistor-level structures of both the active elements proposed in ON Semi I3T CMOS 0.35 um technology that were used for final simulations confirming the workability and features of the designed concept.

show abstract

Investigation of band-stop to all pass reconfigurable filter

Cited by 15 publications

References 9 publications

Electronically Reconfigurable and Tunable Fractional-Order Filter Using Resonator Concept and Feedforward Path for Low-Frequency Tone Signalization

Electronically Reconfigurable and Tunable Fractional-Order Filter Using Resonator Concept and Feedforward Path for Low-Frequency Tone Signalization

Reconnection-less Electronically Reconfigurable Filter with Adjustable Gain Using Voltage Differencing Current Conveyor

Dual-parameter control of the pole frequency in case of universal filter with MCDU elements

Contact Info

Product

Resources

About