Results 11 to 20 of about 56,904 (291)
Quadrature Oscillators Using Operational Amplifiers
Active and Passive Electronic Components, 2011 Two new quadrature oscillator circuits using operational amplifiers are presented. Outputs of two sinusoidal signals with 90° phase difference are available in each circuit configuration.
Jiun-Wei Horng
doaj +1 more source
Digitally Programmable Active-R Function Generator
Active and Passive Electronic Components, 1994 A new digitally programmable active-R function generator circuit is presented. The circuit uses four operational amplifiers, two operational transconductance amplifiers, and resistors. The circuit can provide sinusoidal, square, and triangular waves with
Muhammad Taher Abuelma'Atti
doaj +1 more source
Mathematical Circuit Root Simplification Using an Ensemble Heuristic–Metaheuristic Algorithm
Mathematics, 2023 Symbolic pole/zero analysis is a crucial step in designing an analog operational amplifier. Generally, a simplified symbolic analysis of analog circuits suffers from NP-hardness, i.e., an exponential growth of the number of symbolic terms of the transfer
Navid Behmanesh-Fard +3 more
doaj +1 more source
Novel active-compensated weighted summer [PDF]
, 1980 A summer amplifier with extended bandwidth is proposed. Compensation of the frequency characteristics is achieved by employing two operational amplifiers instead of external reactive ...
Huertas Díaz, José Luis +1 more
core +1 more source
Active and Passive Electronic Components, 2001 A new active-only sinusoidal oscillator is presented. The oscillator circuit uses two internally compensated operational amplifiers, two plus-type second-generation current conveyors and three operational transconductance amplifiers. The proposed circuit
Muhammad Taher Abuelmaatti
doaj +1 more source
Comparison of Howland and General Impedance Converter (GIC) circuit based current sources for bio-impedance measurements [PDF]
, 2010 The current source is a key component in bio-impedance measurement systems. The accuracy of the current source can be measured in terms of its output impedance together with other parameters, with certain applications demanding extremely high output ...
A Zarafshani +11 more
core +1 more source
Applied Sciences, 2020 This paper analyzes the noise sources in photoelectric detection circuits with several low-noise operational amplifiers cores. The fabricated circuits are low-noise pre-amplifiers that are used for optically pumped magnetometers. In the proposed circuits,
Leisong Liu +4 more
doaj +1 more source
New Electronically-Tunable Oscillator Circuit Using Only Two OTAs
Active and Passive Electronic Components, 1998 New oscillator circuit using two operational transconductance amplifiers and grounded capacitors is presented. The oscillator circuit enjoys independent control of the frequency and the condition of oscillation.
Muhammad Taher Abuelma'atti +1 more
doaj +1 more source
The establishment of operational amplifiers output steady state voltage [PDF]
Tehnika, 2015 Operational amplifiers (OA) present indispensable elements in analog signal processing. In practice it is often important to determine how much time an OP's output voltage takes to get close to a steady state within predetermined boundaries. The existing
Radetić Radojle M. +2 more
doaj +1 more source
Huddle test measurement of a near Johnson noise limited geophone [PDF]
, 2017 In this paper, the sensor noise of two geophone configurations (L-22D and L-4C geophones from Sercel with custom built amplifiers) was measured by performing two huddle tests.
Balik G. +17 more
core +3 more sources