Question about opamp output Occsilation

[zhutao73]

occsilate

I use LT1078 to supply 300mv reference voltage. the input to -in is through 165k resistor and fixed to -1.2v, the feedback is 10uF capacitor in parallel with 42.2k resistor. +in is at GND. the output is then fixed at about 300mv. when the loading is only resistance and/or with small capacitance (say about 500 to 1000 pF), the output is good. when the load capacitance is increased to about 2000 pf, vout start to occsilate and occsilate loudly when load capacitance is about 10nF. occsilation frequency is about 50Khz. Could anybody has a idea to supress this occsilation ? Thank you for reading my question and your kindly help.

 

[zhov]

If you want to get 300mV from -1.2V, then what is the reason for using 10uF capacitance in parallel with the 42.2k resistor? Try to remove that capacitor, and check the circuit for oscillations.