S
sunpeak
Hi,
I am wondering if anyone can give me some suggestion on building an
integrator circuit using current feedback op-amps. It is a simple
circuit with R and C, while C is connected for the negtive feedback.
Since the current feeback op-amps like some specific feedback
resistance, I connect a 1k Ohm at the inverting input and then the
summing point for connecting R and C is the other side of this 1k Ohm
resistor. However, the test result is not resonable. If the input
signal is +/- 2.5V square wave, I was supposed to get a triangler wave
at the output if the non-inverting input of the opamp is grounded, but
what I saw at the op-amp output was a severe distorted triangler wave
with some offset volatge as high as 13V (the supply voltages are +/-
15V for the op-amp). Anyone knows why's this large offset and the
distortion?
Thanks,
Spunky
I am wondering if anyone can give me some suggestion on building an
integrator circuit using current feedback op-amps. It is a simple
circuit with R and C, while C is connected for the negtive feedback.
Since the current feeback op-amps like some specific feedback
resistance, I connect a 1k Ohm at the inverting input and then the
summing point for connecting R and C is the other side of this 1k Ohm
resistor. However, the test result is not resonable. If the input
signal is +/- 2.5V square wave, I was supposed to get a triangler wave
at the output if the non-inverting input of the opamp is grounded, but
what I saw at the op-amp output was a severe distorted triangler wave
with some offset volatge as high as 13V (the supply voltages are +/-
15V for the op-amp). Anyone knows why's this large offset and the
distortion?
Thanks,
Spunky