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How can i configure this Circuit to achieve open gain without DC offset ?

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  • #1 21678989
    NYAME EPHRAIM MECHANE
    Anonymous  
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  • #2 21678990
    Rick Curl
    Anonymous  
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  • #3 21678991
    NYAME EPHRAIM MECHANE
    Anonymous  
  • #4 21678992
    David Ashton
    Anonymous  
  • #5 21678993
    Rick Curl
    Anonymous  
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  • #6 21678994
    David Ashton
    Anonymous  
  • #7 21678995
    Sean Ellis
    Anonymous  
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  • #8 21678996
    Elizabeth Simon
    Anonymous  
  • #9 21678997
    David Ashton
    Anonymous  

Topic summary

✨ The discussion addresses achieving open gain in a transistor amplifier circuit without DC offset at the output. It is noted that the output is capacitor-coupled, which should inherently block DC offset. However, the presence of DC offset in simulation results suggests issues such as a faulty capacitor or measurement method. Measuring voltage after the coupling capacitor should yield a signal centered around ground. Simulation artifacts arise because ideal capacitors and voltmeters with infinite input impedance cause the output node to float, resulting in apparent DC offset. Adding a load resistor (e.g., 100kΩ or 220kΩ) across the output in simulation provides a DC path to ground, eliminating the offset and improving simulation accuracy. Suggested circuit improvements include adjusting resistor values (e.g., changing 30kΩ to 33kΩ, 1.6kΩ to 3.3kΩ, adding a 1kΩ emitter resistor, and changing 8.3kΩ to 10kΩ) to stabilize gain and reduce offset sensitivity due to transistor gain variations or supply voltage changes.
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