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spring1860
Joined: 02 Nov 2007
Posts: 94
Helped: 3
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 10 May 2008 17:06 tail transistor considerations |
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hi
about the tail transistor. how to consider it , such as L , gm, or some else .
please give your ideas
thanks.
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jecyhale
Joined: 19 Feb 2008
Posts: 371
Helped: 37
Location: China
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| 13 May 2008 5:10 Re: tail transistor considerations |
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Do you mean the tail current source?
if yes, I think the lengthis most imporment. Then you should make it work in saturation region.
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yschuang
Joined: 01 Feb 2004
Posts: 139
Helped: 10
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| 13 May 2008 5:52 Re: tail transistor considerations |
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If the tail transistor is for input pair, it is better to have a constant gm design for having stable gm.
If the tail transistor is for load like the current mirror, need larger gm, which equivalently means large length.
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