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[SOLVED] Gain increment with resistive network

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ashrafsazid

ashrafsazid

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Hi,

Can anybody help me to design a resistive network which will give 16 steps gain with Rf/R1, where Rf will vary 16 times. The gain will increase from 1 to 16, with an increment of 1. Do I need individual 16 Rf resistors or there could be other techniques to follow?

Thanks for your response. Please help.
 

Give us more details. What supplies do you have available ?
Is this a power application ?
What is the output power needed?
What is the load?
Etc...

- - - Updated - - -

How do you control the gain ? Manually ? (i.e. by hand with a pot) or analogically? with uC ? ...
 

Its an instrumentation application, supply 1.8V, load 5pF. There will be a 4 bit control signal, I will use a 4-to-16 decoder for 16 step control.
 

Thanks a lot FvM, I did not think that way. Its much simpler than using 16 resistors in series and 16 switches. Case solved!
 

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