Ri — ~rr where t is the thermal time constant C*/G* (s).
The load resistor RL is in parallel with the internal resistance of the detector R0 so the output voltage depends on the combination R = R0RL/(R0 + Rl). Similarly the capacitance is C = C0 + CL, if there is any external capacitance CL, stray or otherwise. The electrical time constant is RC, so the (voltage) responsivity is
The responsivity is plotted as a function of the load resistance RL in Fig. 9.4. It is desirable to operate at frequencies in the 'plateau' regime where uRC ^ 1
and wt ^ 1, because then the voltage responsivity is independent of chopping frequency
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