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Re: trying to understand the design of op-amp

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  • David
    ... Check here: http://groups.yahoo.com/group/softrock40/message/66096
    Message 1 of 2 , Jun 30, 2012
      --- In softrock40@yahoogroups.com, "tomshong" <tomshong@...> wrote:
      > I see the op-amps in RX II are wired such that its `high' is connected to VDD, and `low'is connect to ground, and that tells me it should only be able to operate between VDD and ground.
      > Yet, when I ran transient simulation in LTspice, shows the output voltage swings such that it's going between + and – range.
      > I see there are the DC-blocking cap, C46 and C47, at the output of the Op-Amp. It seems, after that point, only the AC component will pass through, and will be biased to whatever is after the cap.
      > So why is the op-amp is designed such that the output drops to the negative range when the op-amp is biased between VDD and ground?
      > Tom

      Check here: http://groups.yahoo.com/group/softrock40/message/66096
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