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mindsinmotion
Joined: 18 Nov 2005
Posts: 2
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 18 Nov 2005 0:25 Urgent!Need Help!Designing Telescopic Amplifier |
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Hi all,
I need help designing the 2 stage telescopic amplifier using both Bipolar as well as MOS devices.The gain required is grater than 100,000(greatest possible).I will greatly appreciate any inputs like where to use bipolars in the design which will benefit me most.
Thanks
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bastos4321
Joined: 01 Jan 1970
Posts: 341
Helped: 24
Location: space
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18 Nov 2005 0:47 Re: Urgent!Need Help!Designing Telescopic Amplifier |
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| mindsinmotion wrote: |
Hi all,
I need help designing the 2 stage telescopic amplifier using both Bipolar as well as MOS devices.The gain required is grater than 100,000(greatest possible).I will greatly appreciate any inputs like where to use bipolars in the design which will benefit me most.
Thanks |
I would use the bipolars in the diferential pair to get higher gm and in the cascode transistors.
Bastos
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sunking
Joined: 25 May 2004
Posts: 914
Helped: 46
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18 Nov 2005 2:14 Urgent!Need Help!Designing Telescopic Amplifier |
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the input should use biplor, not only higher gm, but also low offset, low noise
the output can use biplor too for low output resistor.
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18 Nov 2005 2:14 Ads |
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mindsinmotion
Joined: 18 Nov 2005
Posts: 2
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18 Nov 2005 4:40 Re: Urgent!Need Help!Designing Telescopic Amplifier |
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But then where shall I use MOS devices?
By input I think you mean the i/p differential pair.
By o/p do you mean 2nd stage or p channel current mirrors on top of i/p differential pair?
Also how should I bias such a high gain opamp?
What other tricks can I use to ensure highest gain, what about common mode feedback, cascoded stages, or are there any other techniques?
I appreciate your help.
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