Author Topic: problem in designing multi-stage amplifier  (Read 1463 times)

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Offline massprogTopic starter

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problem in designing multi-stage amplifier
« on: January 20, 2017, 04:19:51 pm »
hi dears
I should design an amplifier as soon as possible and for this reason I got confused
amplifier description is : input resistor 250K \$\Omega\$ , output resistor 50 \$\Omega\$ , gain = 80 and minimum swing 3V
I know how to analyse amplifier and how them works.
I got confused that how should start design,what structure should I use and ...
thank you
 

Offline LvW

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Re: problem in designing multi-stage amplifier
« Reply #1 on: January 20, 2017, 05:17:48 pm »
You can use BJT`s, FET`s, classical opamp(s), other amplifying IC`s,....
Any preference?
 

Offline dmills

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Re: problem in designing multi-stage amplifier
« Reply #2 on: January 20, 2017, 05:19:14 pm »
Missing half the spec.

Frequency range? Noise performance? What 1/f corner? Supply voltage? Current consumption?
50 ohm output resistor or capable of driving a 50 ohm load, these are very different objectives.... 

Something jfet input feels right (High Z input), but it very much depends on the other parameters, this could be a single opamp maybe with an additional current booster, or it could be several pages of clever circuitry it depends.

73 Dan.
 

Offline massprogTopic starter

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  • Posts: 5
  • Country: ir
Re: problem in designing multi-stage amplifier
« Reply #3 on: January 20, 2017, 05:26:50 pm »
You can use BJT`s, FET`s, classical opamp(s), other amplifying IC`s,....
Any preference?
I should design simple bjt amplifier with description that I mentioned
 

Offline massprogTopic starter

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  • Posts: 5
  • Country: ir
Re: problem in designing multi-stage amplifier
« Reply #4 on: January 20, 2017, 05:32:28 pm »
Missing half the spec.

Frequency range? Noise performance? What 1/f corner? Supply voltage? Current consumption?
50 ohm output resistor or capable of driving a 50 ohm load, these are very different objectives.... 

Something jfet input feels right (High Z input), but it very much depends on the other parameters, this could be a single opamp maybe with an additional current booster, or it could be several pages of clever circuitry it depends.

73 Dan.
50 ohm output not load
supply voltage could considered 12v
I want design very simple not advanced design
thank you
« Last Edit: January 20, 2017, 06:02:17 pm by massprog »
 


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