Papers by Dr. Dinesh Prasad
Multi-function biquad using single current differencing transconductance amplifier
Analog Integrated Circuits and Signal Processing, Dec 1, 2009
... Dinesh Prasad recieved B. Tech. ... He held the positions of Assistant Engineer in Delhi Elec... more ... Dinesh Prasad recieved B. Tech. ... He held the positions of Assistant Engineer in Delhi Electric Supply Undertaking, Delhi, from June 1981 to January 1984, Lecturer (19841990) and Senior Lec-turer (19901995) at the Elec-trical Engineering Department, Delhi College of ...
Grounded Lossy Inductance Simulator Using Single FTFNTA
IEEE India Conference, Dec 10, 2020
In this study, two topologies are proposed for the realization of grounded lossy inductance simul... more In this study, two topologies are proposed for the realization of grounded lossy inductance simulator, which performs as series RL or parallel RL impedances, using only one active FTFNTA (Four Terminal Floating Nullor Transconductance Amplifier) circuit and three grounded passive components. The designed lossy inductance simulator exhibits electronic tuning altered by the bias current of the FTFNTA. Also, the values of equivalent resistance and inductance are individually and independently controllable by changing the magnitude of different passive components. To validate the workability of the proposed design, it is used in a Passive RLC filter. All simulations are performed by the PSPICE simulator and these simulated results verify the theoretical interpretation.
Advances in Electrical and Electronic Engineering, 2016
This article presents a new dual-mode (i.e. both current-mode and voltage-mode) quadrature sinuso... more This article presents a new dual-mode (i.e. both current-mode and voltage-mode) quadrature sinusoidal oscillator using two Voltage Differencing Current Conveyors (VDCCs), two resistors and two capacitors. The proposed configuration use only grounded passive elements and enjoys independent resistor/electronic tuning of both Condition of Oscillation (CO) as well as Frequency of Oscillation (FO). The quadrature current and voltage mode outputs of this circuit are available at appropriate impedance terminals. The behavior of presented oscillator is also examined under non ideal/parasitic conditions. The validity of the proposed configuration has been confirmed by SPICE simulations with TSMC 0.18μm process parameters.
A novel digitally programmable quadrature oscillator using DCVDGA
2017 International Conference on Applied System Innovation (ICASI)
In this paper a novel digitally programmable voltage mode (VM) quadrature oscillator (QO) employi... more In this paper a novel digitally programmable voltage mode (VM) quadrature oscillator (QO) employing DCVDGAs has been presented. The idea of DCVDGA is developed by inserting a digital control unit (DCU) with conventional VDGA The proposed oscillator configuration consists of two DCVDGAs along with three grounded passive components (two capacitors and one resistor) and offers following beneficial features: (i) all the grounded passive elements are used (ii) independent control of frequency of oscillation (FO) and condition of oscillation(CO) (iii) independent electronic control of FO (iv) independent digital control of FO and (v) low active and passive sensitivities. The parasitics effect of DCVDGA's at high frequency behavior and tunability of presented topology is also shown. The performance of proposed circuit is verified using SPICE simulation with TMSC 0.18µm process parameters.
Journal of Engineering Science and Technology, 2017
In this paper a new grounded inductor simulator employing single voltage differencing transconduc... more In this paper a new grounded inductor simulator employing single voltage differencing transconductance amplifier (VDTA) and one grounded capacitor has been proposed. The proposed circuit is electronically controllable and exhibits low parasitic effects. The performance of proposed inductor simulator is demonstrated by SPICE simulations with TSMC CMOS .18 µm process parameters.
A voltage mode multi input single output (MISO)-type biquad using single output operational trans... more A voltage mode multi input single output (MISO)-type biquad using single output operational transconductance amplifiers (OTAs) is proposed. The presented circuit utilizes two OTAs, one buffer and two capacitors. The circuit performs all the basic five filter responses: Low Pass, High Pass, Band Pass, Band Reject and All Pass without any component matching constraints. The natural frequency (ω 0) and quality factor (Q 0) are orthogonally controllable. The functionality of the proposed biquad filter has been simulated using PSPICE with TSMC CMOS 0.18μm process parameters.
Novel Active Circuit for Realizing Variable Grounded Passive Elements
2016 International Conference on Micro-Electronics and Telecommunication Engineering (ICMETE), 2016
This research paper presents a novel circuit configuration which can increase or decrease the val... more This research paper presents a novel circuit configuration which can increase or decrease the value of an arbitrary grounded passive component. The proposed configuration employs two voltage differencing transconductance amplifiers (VDTAs) and does not require any passive component except the component to be scale. Hence, this configuration can be considered as a completely active circuit. The proposed circuit can increase/decrease the value of used passive component by a multiplication factor which includes the tranconductance gains of VDTAs. So, the value of passive element can be tuned electronically by varying bias currents. The presented configuration has several beneficial features such as no requirement(s) of component matching, low sensitivity indexes and excellent behavior under non-ideal conditions. The utilization of presented passive element multiplier has been validated by a high-pass filter design example. To verify the mathematical analysis, SPICE simulations have bee...
New CM/VM 3rd-order quadrature oscillator using VDCCs
2017 International Conference on Applied System Innovation (ICASI), 2017
This article proposes a new current-mode(CM)/voltage-mode (VM) 3rd-order quadrature oscillator us... more This article proposes a new current-mode(CM)/voltage-mode (VM) 3rd-order quadrature oscillator using three VDCCs, three capacitors and six resistors. The proposed configuration employs only grounded capacitors and provides quadrature current as well as voltage mode outputs. The proposed configuration has been verified by SPICE simulation with TSMC 180nm process parameters.
Automatika, 2018
Programmable resistor and analog computational circuits are essential for many applications such ... more Programmable resistor and analog computational circuits are essential for many applications such as analog signal processing units, automatic gain control, neural, fuzzy and instrumentation systems. A high-performance programmable grounded resistor (PGR) using complementary metal oxide semiconductor (CMOS) technology is proposed in this paper. A highly linear CMOS resistor with equivalent resistance ranging from 9.4 to 1.5 k is obtained by cancelling the nonlinear term present in the current equation of an MOSFET working in the linear region. The proposed resistor operates on both positive as well as negative input voltage. The inherited features of PGR are simplicity, extensive control voltage range, wider bandwidth and low-power dissipation. Additionally, analog computational units such as multiplier, squarer and divider are also discussed as applications of the PGR. All circuits are implemented and simulated using TSMC 0.13 µm CMOS technology in SPICE.
Journal of Engineering Science and Technology Review, 2015
This paper proposes a new active synthetic floating resistor circuit employing three voltage diff... more This paper proposes a new active synthetic floating resistor circuit employing three voltage differencing transconductance amplifiers (VDTAs). The proposed configuration enjoys following advantageous features; (a) purely active realization (b) electronically tunable resistance (c) no external component matching constraint(s) (d) good nonideal behavior and (e) low sensitivity values. The workability of proposed resistor simulator has been verified by an application example of voltage mode low-pass filter. To validate the theoretical analysis SPICE simulations with TSMC 0.18µm CMOS process parameters have been performed.
Electronics ETF, 2014
This paper proposes a new single resistancecontrolled sinusoidal oscillator (SRCO) which employs ... more This paper proposes a new single resistancecontrolled sinusoidal oscillator (SRCO) which employs only onevoltage differencing current conveyor (VDCC), two groundedresistors and two grounded capacitors. The presented circuitconfiguration offers the following advantageous features (i)explicit current-mode output with independent control ofcondition of oscillation (CO) and frequency of oscillation (FO) (ii)low active and passive sensitivities and (iii) a very good frequencystability. The proposed structure can also be configured as (a)trans-admittance low pass filter and band pass filter and (b)quadrature oscillator. The validity of the proposed SRCO,quadrature oscillator and trans-admittance low pass filter andband pass filter has been verified by PSPICE simulations usingTSMC CMOS 0.18μm process model parameters.
Electronics ETF, 2017
This paper proposes a new purely active floating resistance simulation circuit employing two volt... more This paper proposes a new purely active floating resistance simulation circuit employing two voltage differencing trans-conductance amplifiers (VDTAs). The proposed configuration enjoys following advantageous features; (i) purely active realization (ii) electronically tunable resistance (iii) no requirement of any active/passive component matching constraint (iv) good non-ideal behavior and (v) low sensitivity values. The Influence of VDTA terminal parasitics on high frequency behavior of proposed circuit is also investigated. The workability of proposed resistor simulator has been verified by an application example of voltage mode low-pass filter. To validate the theoretical analysis, SPICE simulations with TSMC 0.18μm CMOS process parameters have been performed.
Contemporary Engineering Sciences, 2017
A high performance FGMOS based current mirrors at low supply voltage is proposed in this paper. A... more A high performance FGMOS based current mirrors at low supply voltage is proposed in this paper. A combination of floating gate and CMOS technology is used to design this new simple current mirror at low supply voltage of 0.5V using 180nm CMOS technology. Very low input impedance of 14Ω with increased input voltage swing. In addition to accurate current copy, a very high output impedance of 5GΩ is achieved with low power consumption of 42.6 µW.
Advances in Electrical and Electronic Engineering, 2016
This article presents a new dual-mode (i.e. both current-mode and voltage-mode) quadrature sinuso... more This article presents a new dual-mode (i.e. both current-mode and voltage-mode) quadrature sinusoidal oscillator using two Voltage Differencing Current Conveyors (VDCCs), two resistors and two capacitors. The proposed configuration use only grounded passive elements and enjoys independent resistor/electronic tuning of both Condition of Oscillation (CO) as well as Frequency of Oscillation (FO). The quadrature current and voltage mode outputs of this circuit are available at appropriate impedance terminals. The behavior of presented oscillator is also examined under non ideal/parasitic conditions. The validity of the proposed configuration has been confirmed by SPICE simulations with TSMC 0.18 µm process parameters.
Contemporary Engineering Sciences, 2014
A new voltage mode quadrature oscillator (VMQO) employing single Voltage differencing transconduc... more A new voltage mode quadrature oscillator (VMQO) employing single Voltage differencing transconductance amplifier (VDTA), two grounded capacitors and one grounded resistor has been proposed. The proposed circuit enjoys following advantageous features: i) use of all grounded passive elements, ii) availability of electronic tuning, iii) independent control of frequency of oscillation (FO) and condition of oscillation (CO), iv) low parasitic effects and v) low active and passive sensitivities.
A VDVTA-Based Novel Configuration for Realizing Grounded Inductance
Advances in Intelligent Systems and Computing, 2016
This paper proposes a new active simulator of grounded inductance using single voltage differenci... more This paper proposes a new active simulator of grounded inductance using single voltage differencing voltage transconductance amplifier (VDVTA), one grounded capacitor and one grounded resistance. The presented configuration is electronically controllable, exhibits low nonideal effects and has low values of active and passive sensitivity. The working of the presented active inductor simulator is confirmed by employing it in designing of a voltage mode (VM) band-pass biquad filter. The performance of proposed inductor simulator and band-pass filter is demonstrated by SPICE simulations with TSMC CMOS 0.18 µm process parameters.
Novel VDCC based low-pass and high-pass Ladder filters
2015 Annual IEEE India Conference (INDICON), 2015
This paper presents 5th order Low-Pass (LP) and High-Pass (HP) Ladder filters employing two Volta... more This paper presents 5th order Low-Pass (LP) and High-Pass (HP) Ladder filters employing two Voltage Differencing Current Conveyors (VDCCs), four resistors and five capacitors. The workability of the proposed circuits has been tested using SPICE simulations.
Study of some Peak-to-Average Power Ratio reduction techniques in MIMO-OFDM system
2015 Annual IEEE India Conference (INDICON), 2015
Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique which ut... more Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique which utilizes the available spectrum in an efficient manner and provides high data rate transmission. Apart from this, OFDM is also considered to be a promising technique for power efficiency, multipath delay spread tolerance and robustness to the frequency selective fading channels. OFDM when used in combination with Multiple-input Multiple-output configuration increases the diversity gain and system capacity. This diversity is used to mitigate the impairments of wireless channels. With all these advantages, MIMO-OFDM has become the key technique for next generation WLAN and 4G mobile communications. It is used in IEEE 802.11n, IEEE 802.1 6m and LTE. However, MIMO-OFDM system faces the Peak-to-Average Power Ratio (PAPR) problem which results in many restrictions for practical applications. This paper reviews and analyzes some of the important PAPR reduction techniques on the basis of different parameters.
Novel current mode electronically tunable lossless integrator employing VDTA
2015 Annual IEEE India Conference (INDICON), 2015
This paper proposes a new lossless current-mode (CM) integrator employing one VDTA and single gro... more This paper proposes a new lossless current-mode (CM) integrator employing one VDTA and single grounded capacitor. The single active element based configuration has low power dissipation and less requirement of chip area and the use of grounded capacitor is favorable from monolithic integration point of view. The advantageous feature of proposed integrator are; (i) purely a resister-less realization (ii) facility of electronic control (iii) availability of explicit current output at high impedance port and (iv)very good non-ideal performance. The workability of proposed CM integrator is demonstrated by SPICE simulations with TSMC CMOS .18 μm process parameters.
Circuits and Systems, 2015
Three voltage mode universal filter biquads using digitally programmable second generation curren... more Three voltage mode universal filter biquads using digitally programmable second generation current conveyor (CCII) are presented in this paper. Salient features of proposed filter configurations include the realization of all the filter functions except allpass, independently programmable filter parameters, no component matching constraint and low sensitivity figure. Component count of proposed filter configurations is proved to be minimal for offering aforementioned set of features. The workability of proposed circuit is verified by including the SPICE simulations.
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Papers by Dr. Dinesh Prasad