I would like to ask about some questions which I am not sure of, am I right that the voltage across the RL is -1.25Vdc with a supply voltage of -4.05Vdc with the diodes arranging in such a way?
According to me, simple KVL can give u the answer.
Since each diode has a forward bias drop of 0.7V, the voltage across resistor will simply be Vsource - 4 * 0.7
sorry for the poor illustration... think this one would be a better one... i intent to pump in a negative DC voltage... and hope to achieve a -1.25Vdc at the load...