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Fully Uncoupled Electronically Controllable Sinusoidal Oscillator Employing VD-DIBAs  [PDF]
Data Ram Bhaskar, Dinesh Prasad, Kanhaiya Lal Pushkar
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.43035
Abstract: Recently, voltage differencing-differential input buffered amplifiers (VD-DIBA)-based electronically controllable sinusoidal oscillator has been presented that it does not have the capability of complete independence of frequency of oscillation (FO) and condition of oscillation (CO) as well as electronic control of both CO and FO. In this article, a new fully-uncoupled electronically controllable sinusoidal oscillator using two VD-DIBAs, two grounded capacitors and two resistors has been proposed which offers important advantages such as 1) totally uncoupled and electronically controlled condition of oscillation (CO) and frequency of oscillation (FO); 2) low active and passive sensitivities; and 3) a very good frequency stability factor. The effects of non-idealities of the VD-DIBAs on the proposed oscillator are also investigated. The validity of the proposed formulation has been confirmed by SPICE simulation with TSMC 0.18 μm process parameters.
Electronically Controllable Sinusoidal Oscillator Employing CMOS VD-DIBAs  [PDF]
Dinesh Prasad,D. R. Bhaskar,K. L. Pushkar
ISRN Electronics , 2013, DOI: 10.1155/2013/823630
Abstract: A new electronically controllable sinusoidal oscillator employing two voltage differencing-differential input buffered amplifiers (VD-DIBAs), two grounded capacitors, and one grounded resistor is presented. The proposed configuration offers (i) independent control of condition of oscillation (CO) and frequency of oscillation (FO) formerly by resistance and later through transconductance, (ii) low active and passive sensitivities, and (iii) a good frequency stability. The workability of the proposed configuration has been demonstrated by SPICE simulation. 1. Introduction Sinusoidal oscillators find numerous applications in communication, control systems, signal processing, instrumentation, and measurement systems. In the recent past, a large number of single resistance controlled oscillators (SRCOs) have been proposed, see [1–11]; however, in all these SRCOs, the frequency of oscillation can be controlled by varying the values of resistances involved. Obviously, by replacing one of the grounded resistors by JFETs/MOSFETs, electronic tunability can be established, see [2, 4] and the references cited therein. Electronically controllable sinusoidal oscillators (ECSOs) based on different active building blocks are available in the literature, see [12–17] and the references cited therein. The advantages, applications, and usefulness of recently introduced new active building block named voltage differencing-differential input buffered amplifier (VD-DIBA) are now being recognized in the literature [18–20]. Recently, electronically controllable grounded and floating simulated inductance circuits using VD-DIBAs have been introduced in [20]. However, to the best knowledge and belief of the authors, no ECSO using VD-DIBAs has yet been presented in the open literature so far. The purpose of this paper is, therefore, to propose a new ECSO using VD-DIBAs along with a minimum possible number of grounded passive components, which offers (i) independent control of oscillation frequency and condition of oscillation, (ii) low active and passive sensitivities, and (iii) a good frequency stability factor. 2. The Proposed Configuration The schematic symbol and behavioral model of the VD-DIBA are shown in Figures 1(a) and 1(b), respectively [18]. 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: Figure 1: (a) Schematic symbol, (b) behavioral model of
Electronically Controllable Sinusoidal Oscillator Employing CMOS VD-DIBAs
Dinesh Prasad,D. R. Bhaskar,K. L. Pushkar
ISRN Electronics , 2013, DOI: 10.1155/2013/823630
Abstract:
Electronically Controllable Explicit Current Output Sinusoidal Oscillator Employing Single VDTA  [cached]
Dinesh Prasad,D. R. Bhaskar
ISRN Electronics , 2012, DOI: 10.5402/2012/382560
Abstract:
Electronically Controllable Explicit Current Output Sinusoidal Oscillator Employing Single VDTA  [PDF]
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
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.
An Electronically Controllable Method for Radar Cross Section Reduction for a Microstrip Antenna
Yuping Shang;Shao-Qiu Xiao;Jia-Lin Li;Bing-Zhong Wang
PIER , 2012, DOI: 10.2528/PIER12022203
Abstract: PIN diodes are used to electronically switch a rectangular microstrip antenna between the optimal radiation state and the low radar cross section (RCS) state in this paper. A useful loading circuit is proposed. The circuit is connected between the patch and the ground plane of the antenna at each loading position. The loading positions of the circuit are determined by studying magnitude distributions of the induced electric field and analyzing statistically how many times that the maximum electric field occurs in each area for each discussed incident angle. PIN diodes are equivalent to capacitances and resistances when diodes are reverse-biased and forward-biased, respectively. When the antenna is not in service and excited by an incident plane wave, obvious RCS reduction is realized. In addition, the radiation performances are well maintained when the antenna is in service for transmitting or receiving signals.
New Electronically-Controllable Lossless Synthetic Floating Inductance Circuit Using Single VDCC  [PDF]
Dinesh Prasad, Javed Ahmad
Circuits and Systems (CS) , 2014, DOI: 10.4236/cs.2014.51003
Abstract:

A new electronically-controllable lossless floating inductance (FI) circuit (without any matching condition) has been presented, which employs only one Voltage Differencing Current Conveyor (VDCC), one grounded capacitor and one grounded resistor. The main aim of the paper is to present a new floating inductance simulator using single active device with minimum passive components. The proposed floating inductance simulator can be electronically controllable by changing the bias current. The workability of the new presented FI circuit has been verified using SPICE simulation with TSMC CMOS 0.18 μm process parameters.

Electronically Controllable Fully-Uncoupled Explicit Current-Mode Quadrature Oscillator Using VDTAs and Grounded Capacitors  [PDF]
Dinesh Prasad, Mayank Srivastava, Data Ram Bhaskar
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.42023
Abstract:

An electronically controllable fully uncoupled explicit current-mode quadrature oscillator employing Voltage Differencing Transconductance Amplifiers (VDTAs) as active elements has been presented. The proposed configuration employs two VDTAs along with grounded capacitors and offers the following advantageous features 1) fully and electronically independent control of condition of oscillation (CO) and frequency of oscillation (FO); 2) explicit current-mode quadrature oscillations; and 3) low active and passive sensitivities. The workability of proposed configuration has been demonstrated by PSPICE simulations with TSMC CMOS 0.18 μm process parameters.

A Current-mode Electronically Controllable Multifunction Biquadratic Filter Using CCCIIs
MONTREE SIRIPRUCHYANUN,Somchai Srisakultiew,Supawat Lawanwisut
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems , 2013, DOI: 10.11601/ijates.v2i2.11
Abstract: This article presents a current-mode multifunction biquadratic filter performing completely standard functions low-pass, high-pass, band-pass, band-reject and all-pass functions. The circuit principle is based on second-generation current-controlled current conveyor (CCCII) with three input terminals and one output terminal. The features of the circuit are that, the pole frequency can be electronically tuned via the input bias currents. The circuit topology is very simple, consisting of merely 2 CCCIIs and 2 grounded capacitors. Without any external resistor and using only grounded elements, the proposed circuit is very comfortable to further develop into an integrated circuit architecture. The PSpice simulation results are shown. The given results agree well with the theoretical anticipation. The total power consumption is approximately 1.87mW at ±1.5V power supply voltages.
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