Understand Diode Connected MOSFET Circuit

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SUMMARY

The discussion focuses on the operation of a diode-connected MOSFET circuit, specifically analyzing the relationship between input voltages (Vh and Vl) and output voltages (Vbn and Vbp). It is established that the drains of all four MOSFETs are connected to their gates, resulting in Vds equaling Vgs, which ensures that the MOSFETs operate in saturation or cutoff regions. The conclusion confirms that Vbn and Vbp will yield identical outputs when Vh and Vl are applied as inputs.

PREREQUISITES
  • Understanding of MOSFET operation principles
  • Familiarity with circuit analysis techniques
  • Knowledge of saturation and cutoff regions in transistors
  • Basic concepts of voltage and current relationships in electronic circuits
NEXT STEPS
  • Study the characteristics of diode-connected MOSFETs in detail
  • Learn about MOSFET saturation and cutoff conditions
  • Explore circuit simulation tools like LTspice for practical analysis
  • Investigate applications of diode-connected MOSFETs in analog circuits
USEFUL FOR

Electrical engineers, circuit designers, and students studying semiconductor devices will benefit from this discussion, particularly those interested in MOSFET circuit design and analysis.

shaikss
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Hi,

Can you please let me know how does the attached circuit work?
Vh and Vl are inputs ; Vbn and Vbp are outputs.

Thanks in advance.
 

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Drains of all four MOSFETs are attached to Gates. Thus for all of them Vds=Vgs (> Vgs - Vth). So all of them are in either saturation or cutoff.
However, if Vh and Vl are inputs VBN and VBP will give same output for sure.
 

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