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... 2.18.5 Background Resistors are used at ac in similar ways to those dc applications of earlier assignments. There is no phase shift across a true resistance, and the ratio of voltage to current shown by a resistance is constant with frequency, so the behaviour at ac is no different from its behaviou ...
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... DAC can be used to control both attenuators. In addition, a step-up/down feature allows user-programmable attenuator stepping through command pulses without reprogramming the SPI interface. The MAX19791 is a monolithic device designed using one of Maxim’s proprietary SiGe BiCMOS processes. The part ...
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... The following are precautions for individual products. Please also refer to the common precautions for Fixed Resistors in this catalog. 1. Transient voltage If there is a possibility that the transient phenomenon (significantly high voltage applied in a short time) may occur or that a high voltage p ...
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... Gas residuals have a negative influence on the current stability. Molecules or atoms can be ionised by the emitted electrons and the emitter gets destroyed by ion bombardment [10]. Additionally a change of the emitter work function is possible by adsorption of gas residuals on the emitter surface [11 ...
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< 1 ... 9 10 11 12 13 14 15 16 17 ... 984 >

Current mirror

A current mirror is a circuit designed to copy a current through one active device by controlling the current in another active device of a circuit, keeping the output current constant regardless of loading. The current being 'copied' can be, and sometimes is, a varying signal current. Conceptually, an ideal current mirror is simply an ideal inverting current amplifier that reverses the current direction as well or it is a current-controlled current source (CCCS). The current mirror is used to provide bias currents and active loads to circuits. It can also be used to model a more realistic current source (since ideal current sources don't exist).The circuit topology covered here is one that appears in many monolithic ICs. It is a Widlar mirror without an emitter degeneration resistor in the follower (output) transistor. This topology can only be done in an IC as the matching has to be extremely close and cannot be achieved with discretes.Another topology is the Wilson mirror. The Wilson mirror solves the Early effect voltage problem in his design.
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