Electronic filter

About: Electronic filter is a research topic. Over the lifetime, 13207 publications have been published within this topic receiving 93063 citations. The topic is also known as: filter.

Integration of analog filters in a bipolar process

Abstract: Monolithic analog filters are described which are based on the integration of electronic transconductors and capacitors. The method used allows simulation of inductor capacitor filters. The transconductors are voltage-controlled current sources provided with a scaling multiplier. The value of one external resistor and matching of integrated elements determine the transconductances. Capacitors are made with an oxide/nitride dielectric on the low-ohmic emitter diffusion and with an aluminium top electrode. Applications include PCM low-pass filters, viewdata modem filters, etc. The method is extendable from the audio band up to video frequencies. Simple breadboarding, no need for special CAD, and an extremely low supply power consumption are features of the filter type. The filters are on-chip compatible with analog and digital system parts.

Front end filter circuitry for a dual band GSM/DCS cellular phone

Abstract: A front end circuit for an RF dual band GSM/DCS phone includes a first channel including an elliptical high-pass filter, a first SAW filter, and a low noise amplifier and a second channel including a second SAW filter and a second low noise amplifier. The output of each channel is alternately switchable to a single-side band mixer circuit. This front end circuit arrangement provides significantly reduced cost and part count over other approaches.

Passive Harmonic Filter Planning in a Power System With Considering Probabilistic Constraints

Abstract: This paper presents a new method for planning single-tuned passive harmonic filters to control harmonic voltage distortion throughout a power system. In the problem, the probabilistic characteristics of the harmonic source currents and network harmonic impedances in the filter planning are taken into account. The objective is to minimize the total filter installation cost, while the harmonic voltage limits and filter component constraints are satisfied with predetermined confidence levels. To obtain the optimal size of each filter component of the planning problem, the proposed procedure is first to find the candidate filter buses based on the sensitivity analysis. Next, the formulated probability-constrained problem is transformed into a deterministic nonlinear programming problem and is solved by a genetic-algorithm-based optimizer. The proposed solution procedure is tested with an actual distribution network and is verified by the conventional deterministic approach and by the Monte Carlo simulation. Numerical experiences show that the proposed method yields favorable results compared with the other two approaches.

DC/DC ZVS full bridge converter power supply method and apparatus

Abstract: Disclosed is a DC/DC converter apparatus comprising a full bridge non-resonant pulse-width-modulated (PWM) switching circuit, which includes inductive device(s), clamp diodes, and an output transformer rectifier and filter circuit. Capacitive and diode elements associated with bridge switching devices operate to switch current through the switches at substantially zero voltage (ZVS). The inductor element and clamp diodes are used to reduce the primary transition shoot through current resulting from reverse recovery of the transformer secondary rectification stage while also reducing emi and semiconductor stresses.