I'm trying to design a clock with 1.8V CMOS. I've designed the Op-amp and individually it works fine (simulated with up to 10MHz pulse input) . But when I use this opamp to draw the feedback circuit , it provides no output.
Output stays tends to zero volts (actually -41 uV ). As there is no desired output,I'v tried many capacitor value and feedback resistor value to see any kind of output pulse, but no luck. As I do not concern with limiting current, current limiting resistor is not used. I even manually give pulse in input to provide startup condition, no luck there either.
Please, could you give my any suggestion, where could I possibly do wrong? How should I approach next?
thank you for your time.