Cascading Op Amp: Practical Experience Needed

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Discussion Overview

The discussion focuses on the practical experience of cascading video amplifiers, specifically the NE592 and LM733, to achieve wide bandwidth and high gain. Participants explore the implications of high gain, including noise and oscillation concerns, while discussing target specifications for bandwidth and gain.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks practical experience with cascading video amplifiers for achieving wide bandwidth and high gain.
  • Another participant raises concerns about the potential for increased noise with high gain and asks for the application and target specifications.
  • Concerns are expressed regarding the possibility of oscillations when using high gain and wide bandwidth configurations.
  • A participant specifies a target bandwidth of at least 10 MHz and a voltage gain of at least 10^6, mentioning prior experience with two cascaded ICs.
  • A follow-up question asks for clarification on what is meant by "3 or more pcs" and inquires about plans to mitigate oscillations given the awareness of feedback issues.

Areas of Agreement / Disagreement

Participants express concerns about noise and oscillations associated with high gain configurations, but there is no consensus on specific strategies to address these issues or on the practical experiences with more than two cascaded amplifiers.

Contextual Notes

Participants have not fully defined the application context or provided detailed specifications, which may affect the discussion's conclusions. The discussion also lacks resolution on the best practices for avoiding oscillations in high-gain configurations.

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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