Now, i want to achieve the 1hz-1khz sinusoidal signal -90 degree phase shift, and the signal is not interfered by noise after phase shift (the measurement is the thermal noise of the input resistance, and the voltage is very small and easy to be interfered), if i use the following circuit, is there any recommended operational amplifier(now i used LT1357) or should pay something attention to the circuit?
1. After phase shift, try not to add miscellaneous noise
2. - 90 ° phase shift
3. Are there any operational amplifiers or other circuits recommended?
Really appreciate for your help.