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Q&A How building a follower satisfying rather extreme requirements.

What is your best suggestion for building a follower that would ideally satisfy the following spec: frequency: from 100 Hz (or lower) to 1 GHz input signal impedance: 1 Mohm input signal ampli...

1 answer  ·  posted 3y ago by coquelicot‭  ·  edited 1y ago by Lorenzo Donati‭

Question transistor opamp voltage-follower circuit-design
#5: Post edited by user avatar Lorenzo Donati‭ · 2023-08-09T21:19:44Z (over 1 year ago)
Retagged.
Analog transistor follower
transistor opamp voltage-follower circuit-design
#4: Post edited by user avatar coquelicot‭ · 2021-03-17T14:28:34Z (over 3 years ago)
  • What is your best suggestion for building a follower that would ideally satisfy the following spec:
  • * frequency: from 100 Hz (or lower) to 1 GHz
  • * input signal impedance: 1 Mohm
  • * input signal amplitude: from 1 mV to 1V at least
  • * output load to be driven: 50 Ohm.
  • * The follower need not be absolutely flat (gain = 1), but actually, it is allowed to reduce the signal by a factor of 0.5.
  • * some signal distortion allowed.
  • * also, a small DC offset voltage of few mV can be allowed, as I am interested in the AC component of the signal.
  • If that is not possible, please give me the suggestion that best approaches these specs. Also, I would be happy if the part names or part numbers are indicated.
  • What is your best suggestion for building a follower that would ideally satisfy the following spec:
  • * frequency: from 100 Hz (or lower) to 1 GHz
  • * input signal impedance: 1 Mohm
  • * input signal amplitude: from 1 mV to 1V at least
  • * output load to be driven: 50 Ohm.
  • * The follower need not be absolutely flat (gain = 1), but actually, it is allowed to reduce the signal by a factor of 0.5.
  • * some signal distortion allowed.
  • * also, a small DC offset voltage of few mV can be allowed, as I am interested in the AC component of the signal.
  • If that is not possible, please give me the suggestion that best approaches these specs. Also, I would be happy if the part names or part numbers are indicated.
  • EDIT: as pinpointed by Olin Lathrop, the 1 GHz requirement is fundamentally incompatible with the 1 M Ohm input impedance requirement. So, there is no point to go further for the moment.
#3: Post edited by user avatar coquelicot‭ · 2021-03-16T11:28:29Z (over 3 years ago)
  • What is you best suggestion for building a follower that would ideally satisfy the following spec:
  • * frequency: from 100 Hz (or lower) to 1 GHz
  • * input signal impedance: 1 Mohm
  • * input signal amplitude: from 1 mV to 1V at least
  • * output load to be driven: 50 Ohm.
  • * The follower need not be absolutely flat (gain = 1), but actually, it is allowed to reduce the signal by a factor of 0.5.
  • * also, a small DC offset voltage of few mV can be allowed, as I am interested in the AC component of the signal.
  • If that is not possible, please give me the suggestion that best approach these specs. Also, I would be happy if the part names or part numbers are indicated.
  • What is your best suggestion for building a follower that would ideally satisfy the following spec:
  • * frequency: from 100 Hz (or lower) to 1 GHz
  • * input signal impedance: 1 Mohm
  • * input signal amplitude: from 1 mV to 1V at least
  • * output load to be driven: 50 Ohm.
  • * The follower need not be absolutely flat (gain = 1), but actually, it is allowed to reduce the signal by a factor of 0.5.
  • * some signal distortion allowed.
  • * also, a small DC offset voltage of few mV can be allowed, as I am interested in the AC component of the signal.
  • If that is not possible, please give me the suggestion that best approaches these specs. Also, I would be happy if the part names or part numbers are indicated.
#2: Post edited by user avatar coquelicot‭ · 2021-03-16T08:29:19Z (over 3 years ago)
  • How doing a follower satisfying rather extreme requirements.
  • How building a follower satisfying rather extreme requirements.
#1: Initial revision by user avatar coquelicot‭ · 2021-03-16T08:28:41Z (over 3 years ago) 
How doing a follower satisfying rather extreme requirements.
What is you best suggestion for building a follower that would ideally satisfy the following spec:

* frequency: from 100 Hz (or lower) to 1 GHz
* input signal impedance: 1 Mohm
* input signal amplitude: from 1 mV to 1V at least
* output load to be driven: 50 Ohm.
* The follower need not be absolutely flat (gain = 1), but actually, it is allowed to reduce the signal by a factor of 0.5. 
* also, a small DC offset voltage of few mV can be allowed, as I am interested in the AC component of the signal.

If that is not possible, please give me the suggestion that best approach these specs. Also, I would be happy if the part names or part numbers are indicated.
Analog transistor follower