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What is saturation current in amplifier?
Amplifier saturation occurs when the input voltage is greater than: or when the input voltage is less than: Often, we find that these voltage limits are symmetric, i.e.: For example, the output limits of an amplifier might be L+ = 15 V and L- = -15 V.
What is saturation voltage?
saturation voltage, collector-emitter (VCE(sat)) The voltage between the collector and emitter terminals under conditions of base current or base-emitter voltage beyond which the collector current remains essentially constant as the base current or voltage is increased. (Ref. IEC 747‑7.)
How to prevent the op amp from saturating?
The only way to keep the OpAmp from saturating is to provide an inner feedback loop. This could be done by changing the switch to from a SPST to a DPST type and adding a local feedback resistor Rfb. When SW1 and SW2 are open feedback would be provided by Rfb.
How does a differential amplifier kill the gain?
1 – differential outputs in a differential amplifier 2 – the single-ended output to the internal node in the differential branch. Of course, this kills the gain, but everything is biased properly and the amplifier doesn’t saturate.
How big of resistor do I need for Vout?
When Vout approaches Vzener negative feedback is provided. The resistor from OA- to Vsense needs to be large enough for the zener to dominate with minimal effect from Rsense. A 1K should be fine but something like 100 x Rsense for low values of Rsense should be an OK compromise.
Are there any Rohm Zeners with low capacitance?
Capacitance falls with increasing reverse voltage. Here are some ROHM zeners specifically designed to be low capacitance. The only way to keep the OpAmp from saturating is to provide an inner feedback loop. This could be done by changing the switch to from a SPST to a DPST type and adding a local feedback resistor Rfb.