I want measure Johnson Noise across a resistor having certain over the certain range of frequency or bandwidth practically. I am starting from scratch, how can I build circuitry and instrumentation so that I will get more precise output values. Like theoretically we can calculate (for example, [Vn]^2 = 4RKT∆f ; Vn = 1.6mV for R=16kΩ, T=300K, ∆f=10kHz, K= Boltzmann constant ) but practically I am facing some problems with circuitry.

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    $\begingroup$ What kinds of instruments do you have available? Will you be measuring the resistor temperature? What circuitry is giving you problems? $\endgroup$
    – Gilbert
    Jan 4, 2020 at 20:58
  • $\begingroup$ Related question by same user : Johnson Noise experimental measurement. Also Noise Fundamentals - Johnson Noise. $\endgroup$ Jan 5, 2020 at 1:01
  • $\begingroup$ @Gilbert Yes I'm measuring the surrounding temperature of resistor. I'm having problem in building circuitry of op-amp and it's gain, feedback resistors. $\endgroup$
    – learner
    Jan 7, 2020 at 15:14
  • $\begingroup$ @learner probably you want to ask about the circuitry on the electrical engineering stack exchange. $\endgroup$
    – Gilbert
    Jan 7, 2020 at 15:20