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how do u find ripple rejection ratio of a voltage follower regulator circuit?

if input and output voltages are given for the above circuit and max load current and hfe(min) are given too…….the how do we find
1. ripple rejection ratio
2. load regulation
3. line regulation

The circuit would be helpful. If this is a simple emitter follower with a reference applied to the base:

Ripple rejection depends on the slope of the collector curves, or change in HFE and leakage current with VCB. With what you are given, it would have to be measured.

Load regulation. At high load, calculate IB = IC/HFE. Is this base current enough to change the reference voltage? If not, check VBE versus current, it will have an effect. Probably easier to measure it.

Line regulation is the same as ripple regulation.

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This entry was posted on Friday, July 2nd, 2010 at 9:26 am and is filed under line follower. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “how do u find ripple rejection ratio of a voltage follower regulator circuit?”

  1. hobart_elf Says:
    July 2nd, 2010 at 3:00 pm

    In an ideal voltage follower, the output will be exactly the same as the input.
    References :

  2. billrussell42 Says:
    July 2nd, 2010 at 3:45 pm

    The circuit would be helpful. If this is a simple emitter follower with a reference applied to the base:

    Ripple rejection depends on the slope of the collector curves, or change in HFE and leakage current with VCB. With what you are given, it would have to be measured.

    Load regulation. At high load, calculate IB = IC/HFE. Is this base current enough to change the reference voltage? If not, check VBE versus current, it will have an effect. Probably easier to measure it.

    Line regulation is the same as ripple regulation.

    .
    References :

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