Cascading Op Amp: Practical Experience Needed

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SUMMARY

The discussion centers on the practical experience of cascading video operational amplifiers, specifically the NE592 and LM733, to achieve a bandwidth of at least 10 MHz and a voltage gain of 10^6. Participants highlight the challenges associated with high gain, including increased noise and potential oscillations. The original poster seeks insights from those who have successfully tested configurations with three or more op-amps in cascade, emphasizing the need for strategies to mitigate oscillation issues.

PREREQUISITES
  • Understanding of operational amplifier characteristics and configurations
  • Familiarity with bandwidth and gain specifications in audio/video applications
  • Knowledge of feedback mechanisms and oscillation prevention techniques
  • Experience with NE592 and LM733 operational amplifiers
NEXT STEPS
  • Research techniques for cascading operational amplifiers effectively
  • Learn about noise reduction strategies in high-gain circuits
  • Investigate methods to prevent oscillations in op-amp configurations
  • Explore practical applications of NE592 and LM733 in video amplification
USEFUL FOR

Electronics engineers, audio/video system designers, and anyone involved in high-performance amplifier design will benefit from this discussion.

Ravaner
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Hello. I'm looking for someone having practical experience of cascading video amp like NE592 or LM733 in order to get wide bandwidth and huge gain.
 
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Ravaner said:
Hello. I'm looking for someone having practical experience of cascading video amp like NE592 or LM733 in order to get wide bandwidth and huge gain.

With huge gain can come huge noise. What is the application? What are your target specs?
 
berkeman said:
With huge gain can come huge noise. What is the application? What are your target specs?

And with huge gain and wide bandwidth can come oscillations.
 
Hi. I know that for noise and possible oscillations. My target is BW >= 10 MHz, Av >= 10^^6. I already saw with 2 Ic's cascaded, and I just want to know if someone has really tested with 3 or more pcs.
 
Ravaner said:
Hi. I know that for noise and possible oscillations. My target is BW >= 10 MHz, Av >= 10^^6. I already saw with 2 Ic's cascaded, and I just want to know if someone has really tested with 3 or more pcs.

What's "3 or more pcs"? And if you "know" about the feedback oscillation issue, what is your plan to avoid the oscillations?
 

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