A class AB current-controlled grounded resistor based on a translinear
loop implemented from bipolar transistors is described. Simulation re
sults show that its value is tunable from 30 to similar to 100k Ohm wi
th frequency responses up to 100MHz and beyond. With 12.5V supply volt
ages, the total harmonic distortion (THD) is < 1% for peak to peak mag
nitudes of the input current > 2.5 times the value of the control curr
ent. To illustrate its suitability, the results of a controlled amplif
ier, using this resistor and operating in current-mode, are also given
.