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circuit_design:2_transistors [2023/03/28 09:00] – mexleadmincircuit_design:2_transistors [2023/11/30 01:11] (aktuell) – mexleadmin
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-====== 2. Diodes and Transistors ======+====== 2 Diodes and Transistors ======
  
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-==== 2.9.7 Other MOSFET Applications====+==== 2.9.7 MOSFET as Substitution for Diodes ==== 
 + 
 +Diodes always show a voltage drop given by the forward voltage. To circumvent this issue a MOSFET can be used. \\ 
 +The following example shows one way to cope with it, when two voltage sources should be combined (e.g. a rechargeable battery with $U_1$ and a nonrechargable buffer battery with $U_2$): 
 +  * The __left side__ depicts a way to combine the two voltages with diodes. The higher voltages will be led through the diode. The diode of the lower voltage is set in reverse, since the cathode of the diode is on the higher voltage \\ The disadvantages of this setup are: 
 +    * One cannot choose the voltage on the output. It will be always given by the highest voltage. 
 +    * There will always be the voltage drop of the diode 
 +  * The __right side__ shows an alternative way to connect both voltages: the antiparallel p-MOSFETs avoid conductivity via the due to the body diode. The MOSFET pair is driven by a BJT in order to have a digital signal as an input. \\ The disadvantages of this setup are: 
 +    * It is possible to short-circuit both voltages  
 +    * It is more complex  
 +Often the rightside one can be simplified and the disadvantages can be avoided by using integrated circuits (like [[https://www.analog.com/en/products/ltc4417.html|LTC4417]]) 
 + 
 + 
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 +</WRAP> 
 + 
 + 
 +==== 2.9.8 Other MOSFET Applications====
  
 MOSFETs are not only used for pure switching of currents. Further applications are also: MOSFETs are not only used for pure switching of currents. Further applications are also: