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Search Results: 1 - 10 of 372239 matches for " D. R. Bhaskar "
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Grounded and Floating Inductance Simulation Circuits Using VDTAs  [PDF]
Dinesh Prasad, D. R. Bhaskar
Circuits and Systems (CS) , 2012, DOI: 10.4236/cs.2012.34048
Abstract: New electronically-controllable lossless grounded and floating inductance simulation circuits have been proposed employing Voltage Differencing Transconductance Amplifiers (VDTA). The proposed grounded inductance (GI) circuit employs a single VDTA and one grounded capacitor whereas the floating inductance (FI) circuit employs two VDTAs and one grounded capacitor. The workability of the new circuits has been verified using SPICE simulation with TSMC CMOS 0.18 μm process parameters.
Single VDVTA-Based Voltage-Mode Biquad Filter  [PDF]
Ghanshyam Singh, Dinesh Prasad, D. R. Bhaskar
Circuits and Systems (CS) , 2015, DOI: 10.4236/cs.2015.63006
Abstract: In this paper, an application of voltage differencing voltage transconductance amplifier (VDVTA) in the realization of voltage-mode (VM) multi-input single output (MISO) type biquad is presented. The proposed topology uses one VDVTA as an active element, two capacitors and a grounded resistor. The configuration realizes low pass (LP), high pass (HP), band pass (BP) and notch (BR) filters without the requirement of any matching condition. The natural frequency (w0) and bandwidth (BW) are independently controllable. The proposed circuit offers low active and passive sensitivities of w0. The operation of the proposed circuit has been verified through SPICE simulation with TSMC CMOS 0.18 μm process parameters.
CDDITA-Based Voltage-Mode First Order All Pass Filter Configuration  [PDF]
Dinesh Prasad, Kuldeep Panwar, D. R. Bhaskar, Mayank Srivastava
Circuits and Systems (CS) , 2015, DOI: 10.4236/cs.2015.611025
Abstract: This realization of a voltage-mode first order voltage-mode all pass filter (VM-APF) employing single current differencing differential input transconductance amplifier (CDDITA) as active component is presented. The proposed configuration employs one CDDITA along with two resistors and one grounded capacitor. The pole frequency and phase shift of proposed VM-APF are electronically tunable by transconductance of CDDITA. To validate the theoretical analysis SPICE simulations with TSMC 0.18 μm CMOS process parameters have been performed.
Electronically Controllable Explicit Current Output Sinusoidal Oscillator Employing Single VDTA
Dinesh Prasad,D. R. Bhaskar
ISRN Electronics , 2012, DOI: 10.5402/2012/382560
Abstract:
Electronically Controllable Explicit Current Output Sinusoidal Oscillator Employing Single VDTA
Dinesh Prasad,D. R. Bhaskar
ISRN Electronics , 2012, DOI: 10.5402/2012/382560
Abstract: A new current-mode sinusoidal oscillator employing a single voltage differencing transconductance amplifier (VDTA), two grounded capacitors, and one grounded resistor has been proposed. The proposed sinusoidal oscillator offers the following advantageous features: (i) use of grounded capacitors which are attractive from the view point of IC implementation as well as eliminating/accommodating parasitic capacitances, (ii) independent control of frequency of oscillation and condition of oscillation, (iii) ready availability of explicit current-mode output, (iv) low active and passive sensitivities, and (v) a very good frequency stability. The workability of the proposed configuration has been established by PSPICE simulations. 1. Introduction In the synthesis of signal processing/signal generation circuits, current-mode (CM) operation has received much attention over the conventional voltage-mode (VM) operation due to its wider bandwidth and high linearity [1]. There is a growing interest in the realization of sinusoidal oscillators with explicit CM output because these oscillators may be employed as test signal generators for the testing of CM filters, CM precision rectifier, and so forth, which would otherwise require additional voltage to current converter when tested by using conventional VM oscillators [2]. Sinusoidal oscillators find numerous applications in communication, control systems, signal processing, instrumentation, and measurement systems; see [3–5] and the references cited therein. Explicit current-mode sinusoidal oscillators (ECMSOs) based upon different active single building blocks are available in the literature; see [6–13] and the references cited therein. In [14], many active building blocks have been introduced, VDTA is one of them. Although a CMOS realization of VDTA and its RF filter application has been introduced in [15], to the best knowledge and belief of the authors no other application has been reported in the open literature so far. Therefore, the purpose of this paper is to propose a new ECMSO using a single VDTA along with three passive components (two grounded capacitors and one grounded resistor), which offers (i) use of grounded capacitors which are attractive from the viewpoint of IC implementation as well as eliminating/accommodating parasitic capacitances, (ii) independent control of frequency of oscillation and condition of oscillation (iii) ready availability of explicit current-mode output, (iv) low active and passive sensitivities, and (v) a very good frequency stability. Apart from realizing the intended type
New Grounded and Floating Simulated Inductance Circuits using Current Differencing Transconductance Amplifiers
D. Prasad,D. R. Bhaskar,A. K. Singh
Radioengineering , 2010,
Abstract: Current differencing transconductance amplifier (CDTA) is receiving considerable attention as a building block for current-mode (CM) analog signal processing / signal generation. In this paper, new CDTA based lossless grounded and floating inductance simulation circuits have been proposed. The proposed grounded simulated inductance circuit employs two CDTAs and a single grounded capacitor whereas the floating simulated inductance circuit employs three CDTAs and a grounded capacitor. The circuit for grounded inductance does not require any realization conditions whereas in case of floating inductance only equality of two transconductances is needed (which can be easily maintained in practice by ensuring equal dc bias currents in the two transconductance amplifiers). Some sample results demonstrating the applications of the new simulated inductors using CMOS CDTAs have been given to confirm the workability of the new circuits.
Electronically Controllable Grounded Capacitor Current-Mode Quadrature Oscillator using single MO-CCCDTA
D. Prasad,D. R. Bhaskar,A. K. Singh
Radioengineering , 2011,
Abstract: This paper presents an electronically controllable grounded capacitor quadrature oscillator using single multiple-output current controlled current differencing transconductance amplifier (MO-CCCDTA) as an active element. The proposed circuit employs a single MOCCCDTA, two grounded capacitors and one grounded resistor and offers the advantages of (i) independent control of condition of oscillation (CO) and frequency of oscillation (FO), and (ii) low active and passive sensitivities. The workability of proposed configuration has been demonstrated by PSPICE simulation.
Synthesis of New Single CFOA-Based VCOs Incorporating the Voltage Summing Property of Analog Multipliers
S. S. Gupta,D. R. Bhaskar,R. Senani
ISRN Electronics , 2012, DOI: 10.5402/2012/463680
Abstract:
Synthesis of New Single CFOA-Based VCOs Incorporating the Voltage Summing Property of Analog Multipliers
S. S. Gupta,D. R. Bhaskar,R. Senani
ISRN Electronics , 2012, DOI: 10.5402/2012/463680
Abstract: Recently, current feedback operational amplifier (CFOA) and analog multiplier-(AM-) based-voltage controlled oscillators (VCOs) have been published in the literature which require 2?CFOAs and 2?AMs for linear tuning law between control voltage and frequency of oscillation. In this paper, a family of eight new voltage-controlled oscillators (VCOs), with linear tuning laws, employing only a single CFOA in conjunction with two analog multipliers (AMs), has been derived through a systematic state-variable methodology. This has been made possible by exploiting the voltage summing property of the multiplier chosen which has never been done in the literature earlier. The workability of the presented VCOs has been verified by experimental results based on AD844 type CFOAs and AD534 type AMs, and the advantages of new circuits over the previously known CFOA-AM-based VCOs have been highlighted. 1. Introduction Although a number of new building blocks and concepts related to current-mode circuits have been investigated in the literature [1–3], the use of current feedback operational amplifiers (CFOAs) as an alternative to the traditional voltage-mode op-amps (VOAs) has attracted considerable attention (see [4–7] and the references cited therein) in various instrumentation, signal processing, and signal generation applications due to their commercial availability as off-the-shelf ICs as well as due to the well-known advantages offered by CFOAs over the VOAs [4–6]. Because of these reasons, the use of CFOAs has been extensively investigated in realizing oscillators, for instance, see [6, 8–11] and the references cited therein. Although a variety of CFOAs are available from various manufacturers, AD844 (from Analog Devices), which contains a CCII+ followed by a voltage buffer is particularly flexible and popular due to the availability of -terminal of the CCII+ therein as an externally accessible lead which permits AD844 to be used as a CCII+ (one AD844) or as CCII-(realizable with two AD844s) or as a general 4-terminal building block [6]. This paper is concerned with the use of CFOAs in the realization of voltage-controlled oscillators (VCOs) which are required in several instrumentation, electronic, and communication systems, such as in function generators, in production of electronic music to generate variable tones, in phase locked loops, and in frequency synthesizers [12–17]. Although, recently, the use of CFOAs in the realization of linear VCOs has been reported in [7, 11], in this paper, the voltage summing property of the commercially available analog
Realization of New Electronically Controllable Grounded and Floating Simulated Inductance Circuits Using Voltage Differencing Differential Input Buffered Amplifiers
Dinesh Prasad,D. R. Bhaskar,K. L. Pushkar
Active and Passive Electronic Components , 2011, DOI: 10.1155/2011/101432
Abstract: A new active circuit is proposed for the realisation of lossless grounded and floating inductance employing Voltage Differencing Differential Input Buffered Amplifiers (VD-DIBAs). The proposed grounded simulated inductance circuit employs two VD-DIBAs and a single-grounded capacitor whereas the floating simulated inductance circuit employs three VD-DIBAs and a grounded capacitor. The circuit for grounded inductance does not require any realization conditions whereas in case of floating inductance, only equality of two transconductances is needed. Some sample results demonstrating the applications of the new simulated inductors using VD-DIBAs have been given to confirm the workability of the new circuits. 1. Introduction Several synthetic grounded and floating inductance circuits using different active elements such as operational amplifiers (op-amps) [1–5], current conveyors (CCs) [6–13], current controlled conveyors (CCCIIs) [14, 15], current feedback operational amplifiers (CFOAs) [16], operational mirrored amplifiers (OMAs) [17], differential voltage current conveyors (DVCCIIs) [18], current differencing buffered amplifiers (CDBAs) [19–21], current differencing transconductance amplifiers (CDTAs) [22, 23], and operational transconductance amplifier (OTA) [24] are reported in the literature. Recently, various active building blocks have been introduced in [25], VD-DIBA is one of them. Although some applications of VD-DIBAs have been reported in the literature such as in the realization of all pass section [26], to the best knowledge and belief of the authors, no grounded/ floating inductance simulation circuits using VD-DIBAs have yet been reported in the open literature so far. The purpose of this paper is, therefore, to propose new VD-DIBA-based lossless grounded and floating inductance simulation circuits. 2. The Proposed New Configurations The schematic symbol and equivalent model of the VD-DIBA are shown in Figures 1(a) and 1(b) [26]. The model includes two controlled sources: the current source controlled by differential voltage ( - ), with the transconductance?? , and the voltage source controlled by differential voltage ( - ), with the unity voltage gain. The VD-DIBA can be described by the following set of equations: The proposed configurations are shown in Figures 2 and 3, respectively. Figure 1: (a) Schematic symbol and (b) equivalent model of VD-DIBA [ 26]. Figure 2: Proposed grounded inductance simulation configuration. Figure 3: Proposed floating inductance simulation configuration. A routine analysis of the circuit shown in Figure 2
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