How the ungrounded voltage source vref supply ground current

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Reference no: EM131295272

Bipolar Power Supply Voltages:-

The circuit in Figure produces bipolar power supply voltages V_POS > 0 and VNEG _REF > 0. Note that the OPAMP output is grounded and that its + V_CC and -V_CC terminals are connected to V_POS and V_NEG, respectively.

(a) Show that V_POS = + V_REF=2 and V_NEG = -V_REF=2 even if the load resistors R_POSand R_NEG are not equal.

(b) If R_POS and R_NEG are not equal, a current i_G must flow into or out of ground. How does the ungrounded voltage source V_REF supply this ground current?

(c) In effect, the OP AMP creates a "virtual ground" at point A(V_A = 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?

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Reference no: EM131295272

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