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- US4287479A - Operational amplifier circuit - Google Patents
- Operational Amplifiers Design and Applications - G E Tobey
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A method by means of which the dynamic range of signals may be increased and the dynamic error of the input stages of measuring devices based on Rail-to-Rail operational amplifiers reduced is described. The electrical circuit of the equipment is developed. Results of testing of Rail-to-Rail operational amplifiers in tracking power supply are presented. This is a preview of subscription content, access via your institution. Rent this article via DeepDyve. Wang, L.
US4287479A - Operational amplifier circuit - Google Patents
A design for an amplifier for bioelectric events is presented that has fewer parts than conventional designs. The design allows the construction of amplifiers of a high quality in terms of noise and common mode rejection, with reduced dimensions and with a lower power consumption. Gain, bandwidth and number of channels are easily adapted to a wide range of biomedical applications. An application example is given in the form of a multichannel EEG amplifier gain is , in which each channel consists of three operational amplifiers one single and one dual , six resistors and two capacitors. The equivalent input noise voltage and current are 0. This is a preview of subscription content, access via your institution. Rent this article via DeepDyve.
Operational Amplifiers Design and Applications - G E Tobey
An operational amplifier often op amp or opamp is a DC-coupled high- gain electronic voltage amplifier with a differential input and, usually, a single-ended output. Operational amplifiers had their origins in analog computers , where they were used to perform mathematical operations in linear, non-linear, and frequency-dependent circuits. The popularity of the op amp as a building block in analog circuits is due to its versatility.
This invention relates generally to operational amplifier op amp circuits and, more particularly, to op amp circuits having means for reducing the generation of noise. In the past, op amp circuits have typically included a first amplification stage having a differential pair of matched transistors in a common-emitter configuration. The base elements of the two transistors serve, respectively, as non-inverting and inverting input terminals, and an output signal, proportional to the difference between signals being applied to the two input terminals, is produced at the collector element of one of the transistors. To ensure stability, the gain-bandwidth product of the first amplification stage must ordinarily be limited so that propagation delays in second and subsequent amplification stages won't reduce the phase margin by too much at the unity-gain frequency of the first stage. The customary technique for limiting the gain-bandwidth product of the first amplification stage is to place a resistor in the emitter circuit of each of the two transistors.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Graeme and Gene E. Tobey and L. Graeme , Gene E.
Published June by Mcgraw-Hill Tx. Written in English.