Hi,
I have a peak detector circuit (based on sparkfun SEN-12642). This is supplied by a standard DC supply at 4.5V.
I've altered the circuit so i am inputting an AC signal (between 50 and 200mV) directly to the peak detector part and observing the 'Envelope' output on a scope.
The AC input is being generated by a function generator (Tektronix AFG1062).
I've noticed that the output is changing with Vin so the peak detector appears to be working but i'm concerned as the voltage measured at envelope is always higher than the AC peaks. i.e. about 50mV higher than input.
I've struggled with how to ground this setup and assume that maybe the problem.
Could anyone give direction about how to correctly link the power supply to the function generator so the input is not just 'floating'?
Thanks!
I have a peak detector circuit (based on sparkfun SEN-12642). This is supplied by a standard DC supply at 4.5V.
I've altered the circuit so i am inputting an AC signal (between 50 and 200mV) directly to the peak detector part and observing the 'Envelope' output on a scope.
The AC input is being generated by a function generator (Tektronix AFG1062).
I've noticed that the output is changing with Vin so the peak detector appears to be working but i'm concerned as the voltage measured at envelope is always higher than the AC peaks. i.e. about 50mV higher than input.
I've struggled with how to ground this setup and assume that maybe the problem.
Could anyone give direction about how to correctly link the power supply to the function generator so the input is not just 'floating'?
Thanks!