Design Review of Four Transistor Current Source

One of the engineer's in my group asked if I had any information on how a four transistor current source works. I decided that to pull together a quick Mathcad worksheet. The Wikipedia refers to this current source configuration as a four-transistor improved current mirror. Figure 1 shows an image of this circuit from the Wikipedia.

Figure 1: Four-Transistor Improved Current Mirror (Source: Wikipedia).

Figure 1: Four-Transistor Improved Current Mirror (Source: Wikipedia).

I have attached a PDF version of the Mathcad worksheet and included a link to Mathcad 15 source in a zip file. There is a macro in it that just generates the table of contents.

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3 Responses to Design Review of Four Transistor Current Source

  1. Dp says:

    Hello sir,
    Could you please upload the BJT mirror circuit containing PNP pair at the top and the NPN pair at the bottom and give a explaination for the same.

  2. Dp says:

    Ok mathscinotes. Thanks !

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