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what is the main input for the bandgap?

 
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wolf001



Joined: 09 Sep 2004
Posts: 27
Helped: 1
Location: shanghai,china
Post21 Oct 2004 9:46   what is the main input for the bandgap?
Now I need to do AC analasis for a bandgap. But whar is the main input for the bandgap?

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pixel



Joined: 16 Sep 2004
Posts: 569
Helped: 59
Post21 Oct 2004 11:17   Re: what is the main input for the bandgap?
From my view it is Vcc.
When you put AC generator (with VDC=Vcc, ampl 1V) instead of Vcc you will see output voltage freq. dependance on Vcc noise.
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Fom



Joined: 10 Mar 2004
Posts: 758
Helped: 56
Location: Taiwan
Post21 Oct 2004 12:25   Re: what is the main input for the bandgap?
Inside bangap you should disconnect feedback, insert DC source vdc=0V vac=1mV and run AC analysis. Input is one terminal of DC source output is another. If gain>1 when phase=0 the bandgap is unstable. For your schematic I suppose to insert the DC source into base Q79. Terminal connected to base will be input, another terminal is output.
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kkoko



Joined: 07 Dec 2004
Posts: 22
Post05 Jan 2005 18:27   Re: what is the main input for the bandgap?
Bangap has not a input , but you can make noise analysis to view output noise
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