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In this paper, an electronically tunable immitance circuit is proposed. The presented circuit can be configured as a tunable grounded inductor or capacitor multiplier. The proposed circuit employs a single active element called Voltage Differential Current Conveyor, a single resistor and a single capacitor. The presented circuit does not require element matching constraints. It is linearly tunable...
In this paper, a step-up dc-dc converter for mobile device applications is proposed. The converter is operated with 1 MHz high switching frequency. The power stage of converter includes an inductor, an output capacitor, MOS transistors and feedback resistors for control loop. The control stage consists of an error amplifier, comparator, a ramp generator for PWM block, bandgap reference and soft start...
Traditional mechanical OLTC has some disadvantages while changing the taps, such as causing arc, switching slowly, having high malfunction rate. This paper proposed a kind of intelligent OLTC which equips with vacuum interrupters controlled by permanent magnetic actuators (PMA) as its switching parts. In this paper, the overall structure and electrical circuit scheme of the OLTC were designed on the...
This paper presents a biopotential acquisition unit with an instrumentation amplifier and analog-to-information converter for wearable health monitoring applications. The instrumentation amplifier defines the quality of the acquired biopotential signals. At the heart of the system is an Analog to Information Converter (AIC) to enables the random under-sampling operation. AIC is used to digitize the...
This paper presents a low-power on-chip RC oscillator with compensation for temperature and supply voltage variation. This circuit is based on a conventional on-chip oscillator, with only a capacitor and a comparator to avoid mismatch. Multiple current sources flow through the same resistor to generate a reference voltage. This is complemented with the dynamic element matching technique to reduce...
Capacitance and tan δ measurements are usually carried out to check the healthiness of an insulation. Measuring equipment based on different methodologies to test insulation in cables, transformer bushings etc. are available. This paper presents the development of such a measuring equipment for a high voltage (HV) laboratory of a University. The design is divided into three parts as filter unit, test...
A loop stability compensation technique for continuous-time common-mode feedback (CMFB) circuits is presented. A Miller capacitor and nulling resistor in the compensation network provide a reliable and stable operation of the fully-differential operational amplifier without any performance degradation. The amplifier is designed in a 130 nm CMOS technology, achieves simulated performance of 57 dB open...
Historically, two classes of coupling circuits have been used for power-line communications (PLC), being capacitive couplers and inductive couplers. In this paper, resistive coupling as a radical and novel approach is investigated specifically for the reception of PLC data. The main goal of this new approach, is to reduce costs associated with traditional capacitive and inductive couplers, seeing...
This paper presents a compensation method in which the phase margin and unity gain bandwidth of an Operational Transconductance Amplifier (OTA) is improved by addition a(n) active/passive resistive to the frequency compensation circuit. This improvement is achieved without changing the power consumption of the OTA. Based on the proposed strategy, three different compensation structures including RHC,...
This paper presents a new electronically tunable voltage-mode quadrature sinusoidal oscillator employing four single-ended operational transconductance amplifiers (OTAs) and two grounded capacitors. In general, the single-ended OTA configuration is simpler than the multiple-output OTA counterpart and the requirement of grounded capacitors is preferable for an integrated circuit fabrication process...
This paper presents a new versatile voltage-mode quadrature oscillator circuit using three differential difference current conveyors, two grounded capacitors and three grounded resistors. Unlike the previously reported quadrature oscillator, the proposed circuit can realize a quadrature oscillator and a universal filter without changing the circuit topology. When the circuit works as a quadrature...
This paper presents a new mixed-mode quadrature oscillator using one current controlled current conveyor (CCCII), one CCCII with controlled current gain and two grounded capacitors. The oscillation condition and the oscillation frequency can be controlled orthogonally and electronically by the bias currents of the CCCIIs. The circuit provides two quadrature voltage outputs and four quadrature current...
A current-mode quadrature oscillator using single current follower transconductance amplifier (CFTA) as active element is given. The oscillator has high output impedance, employs two grounded capacitors, single resistor and has electronic control on oscillation condition and on oscillation frequency. The proposed circuit is suitable for integrated circuit (IC) architecture. PSpice simulation result...
A current-mode four-phase quadrature oscillator using 2 current controlled current conveyor transconductance amplifiers (CCCCTAs) and 2 grounded capacitors is presented. The proposed oscillator can provide 4 sinusoidal output currents with 90° phase difference. The oscillation condition and oscillation frequency can be electronically/independently controlled by adjusting the bias current of the CCCCTA...
A novel anti-ESD TGFPTD (Trench Gate and Field Plate and Trench Drain) SOI LDMOS was proposed firstly for improve ESD robustness of TGFPTD SOI LDMOS in this paper. The proposed device was obtained by introducing an additional n+ implantation and rapid thermal annealing into the widen p-well region of conventional TGFPTD SOI LDMOS. 2D simulation of the proposed device upon a negative current pulse...
Using a two-X and two-Z second-generation current conveyor (TXTZCCII) as an active building block, two new single-element-controlled sinusoidal oscillator circuits are proposed. The circuits use only the minimum passive components, two capacitors and two resistors. All proposed circuits enjoy oscillation control through a single grounded passive element(s) and independent frequency control through...
A current-mode quadrature oscillator using single current differencing transconductance amplifier (CDTA), 1 resistor and 2 grounded capacitors is presented. The proposed oscillator can provide 2 sinusoidal output currents with 90° phase difference. The oscillation condition and oscillation frequency can be controlled electronically by adjusting the bias current of the CDTA. High output impedances...
A new electronically tunable single-element-controlled current-mode quadrature oscillator circuit using current differencing transconductance amplifiers (CDTAs) is presented. The proposed oscillator is consisted of two CDTAs, two grounded capacitors and one grounded resistor, which is beneficial to monolithic integrated circuit implementation. The oscillation condition and oscillation frequency of...
We describe an in-situ analog technique for estimating time constant shifts in continuous-time single bit delta-sigma modulators. We show that the variance of the first integrator output of the modulator's loop filter is a good indicator of RC time constants. The nominal values of the time constants are restored by digitally controlling the resistance and capacitance values (realized as switched banks)...
This article presents a current-mode quadrature oscillator using current controlled current feedback amplifiers (CC-CFAs) as active elements. The proposed circuit is realized from a lossy integrator and a lossy differentiator. The oscillation condition and oscillation frequency can be orthogonally controlled via input bias currents. The circuit description is very simple, consisting of merely 2 CC-CFAs,...
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