Bipolar Power Supply Voltages:-
The circuit in Figure produces bipolar power supply voltages VPOS > 0 and VNEG REF > 0. Note that the OPAMP output is grounded and that its + VCC and -VCC terminals are connected to VPOS and VNEG, respectively.
(a) Show that VPOS = + VREF=2 and VNEG = -VREF=2 even if the load resistors RPOS and RNEG are not equal.
(b) If RPOS and RNEG are not equal, a current iG must flow into or out of ground. How does the ungrounded voltage source VREF supply this ground current?
(c) In effect, the OP AMP creates a "virtual ground" at point A(VA = 0) but draws no current in doing so. Why not just connect point A to a "real ground" and do away with the OP AMP?
