Tool/software:
Hi team,
My customers use TLV9061 as voltage follower. The simulation is as below:
But in the actual test, they found that when they added a 50ohm load, like R17, the output which is 5~6mV, can't follow the input which is below 100mV; when they keep the load open, the output is normal which is same as input voltage. So I am not sure whether the Zo influence on the output, which is just 100ohm. Can it support to drive 50ohm load?
Hi Ron,
The input is 120khz ~<100mV PWM signal. And if with 2k load ,the waveform is as below:
the frequency is 120k.
And if with 50ohm, it seems no output, just some noise< 10mV.
If with open load, the waveform is as below:
Do yo think that 2.2uF capacitor influence on the op-amp output signal? The customers use it as block DC signal and the simulation has no issue. But the actual test has obvious issue. Could you help check and give your suggestion? How to change the circuit to realize the voltage follower function?
I believe the problem you see is caused by the short-circuit current limiting the charging rate of 2.2uF capacitive load. Since current through capacitor is defined by Ic = C*dV/dt, solving the equation for max slew rate: dV/dt = Ic/C = 50e-3/2.2e-6 = 0.023V/us where Ic is the short-circuit current and C your capacitive load.
