Precision rectifier

About: Precision rectifier is a research topic. Over the lifetime, 4952 publications have been published within this topic receiving 63668 citations. The topic is also known as: super diode.

A Low Walk Error Analog Front-End Circuit With Intensity Compensation for Direct ToF LiDAR

Abstract: An analog front-end (AFE) circuit comprising an amplifier module, a peak detector, and a timing discriminator has been designed to facilitate the target identification for direct time-of-flight (dToF) LiDAR. The amplitude saturation error (ASE) is compensated in this article for the intensity determination, which is conducted based on the combination of the pulse width and peak detector. Together with the improved walk error compensation scheme, the proposed AFE circuit can attain the distance and intensity information simultaneously with lower cost and larger dynamic range. A specific frequency compensation method is proposed with a shunt feedback TIA, which improves the stability and mitigates the impact of the package parasitics. The measured -3-dB bandwidth, transimpedance gain, and the input-referred noise current are 281 MHz, 86 dB $\Omega $ , and 4.68 pA/ $\surd $ Hz respectively. The proposed AFE circuit, which is fabricated in $0.18~\mu \text{m}$ CMOS technology, achieves the distance accuracy of ±30 ps and the intensity accuracy of ±4% in the dynamic range of 1:5000 without gain control scheme.

High fidelity hearing aid amplifier

Abstract: A single integrated circuit chip is provided with transistors, diodes, resistor and capacitors thereon for forming a variable gainamplifier (40) and gain control circuitry which provides a level dependent frequency response characteristic, operative at low signal levels to enhance gain at higher frequencies relative to that at lower frequencies. The gain control circuitry includes logarithmic rectifier means (48) operative to develop an AC output signal having a peak value varying as a logarithmic function of a signal level which may be that at the output of the variable gain amplifier (40). The AC output signal so developed is applied to a peak detector circuit in a compression ratio control circuit (46) to develop a DC signal which is amplified by a DC amplifier and applied to a control input of the variable gain amplifier (40).

A new single-phase ZCS-PWM boost rectifier with high power factor and low conduction losses

Abstract: This paper proposes a new single-phase high power factor rectifier, which features regulation by conventional PWM, soft commutation and instantaneous average line current control. A new zero-current-switching pulse-width modulation (ZCS-PWM) auxiliary circuit is configured in the presented ZCS-PWM rectifier to perform ZCS in the active switches and ZVS in the passive switches. Furthermore, soft commutation of the main switch is achieved without additional current stress by the presented ZCS-PWM auxiliary circuit. A significant reduction in the conduction losses is achieved, since the circulating current for the soft switching flows only through the auxiliary circuit and a minimum number of switching devices are involved in the circulating current path and the proposed rectifier uses a single converter instead of the conventional configuration composed of a four-diode front-end rectifier followed by a boost converter. Seven transition states for describing the behavior of the ZCS-PWM rectifier in one switching period are described. The PWM switch model is used to predict the system performance. A prototype rated at 1 KW, operating 60 kHz, with an input AC voltage of 220 V/sub rms/ and an output voltage 400 V/sub dc/ has been implemented in laboratory. An efficiency of 98.3% and power factor over 0.99 has been measured. Analysis, design, and the control circuitry are also presented in this paper.

High Speed Rectifier Circuit

Abstract: Provided is a rectifier circuit that includes a depletion mode semiconductor having an output connected to a rectified signal output node of the rectifier circuit and a hot carrier semiconductor diode having a cathode connected to a source node of the depletion mode semiconductor and an anode connected to a gate node of the depletion mode semiconductor. The rectifier may include an alternating current (AC) input node that is connected to the anode of the hot carrier semiconductor diode and the gate node of the depletion mode semiconductor and that is configured to receive an AC input signal.

High efficiency asymmetrical half-bridge converter using a self-driven synchronous rectifier

Abstract: A novel high efficiency asymmetrical half-bridge converter using a self-driven synchronous rectifier is presented. The proposed converter improves the system efficiency using the characteristics of the asymmetrical half-bridge converter and the self-driven synchronous rectifier. The synchronous rectifier applied to the proposed converter is the new topological synchronous rectifier, which is a slightly modified type of the conventional synchronous rectifier used in the conventional asymmetrical half-bridge converter. The type of the new topological synchronous rectifier slightly changes the transformer structure and the synchronous switch connection in the asymmetrical half-bridge converter with a conventional self-driven synchronous rectifier. The operational principle of the proposed converter is explained in detail. Since the proposed converter utilises the transformer leakage inductor as its resonant inductor, its structure is simplified. A design example for a 90 W (12 V/7.5 A) prototype is discussed in detail. Experimental results are shown for the designed prototype converter under universal AC input voltage (180-265 V). It is shown that the efficiency of the proposed converter can be significantly improved.