1.57 A designer is required to provide, across a 10-k load, the weighted sum, vO = 10v1 + 20v2, of input signals v1 and v2, each having a source resistance of 10 k. She has a number of transconductance amplifiers for which the input and output resistances are both 10 k and G m = 20 mA/V, together with a selection of suitable resistors. Sketch an appropriate amplifier topology with additional resistors selected to provide the desired result. Your design should utilize the minimum number of amplifiers and resistors. (Hint: In your design, arrange to add currents.)

57 10 - 1.57 A designer is required to provide, across a 10-k load, the weighted sum, vO = 10v1 + 20v2, of input signals v1 and v2, each having a source resistance of 10 k. She has a number of transconductance amplifiers for which the input and output resistances are both 10 k and G m = 20 mA/V, together with a selection of suitable resistors. Sketch an appropriate amplifier topology with additional resistors selected to provide the desired result. Your design should utilize the minimum number of amplifiers and resistors. (Hint: In your design, arrange to add currents.)

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images - 1.57 A designer is required to provide, across a 10-k load, the weighted sum, vO = 10v1 + 20v2, of input signals v1 and v2, each having a source resistance of 10 k. She has a number of transconductance amplifiers for which the input and output resistances are both 10 k and G m = 20 mA/V, together with a selection of suitable resistors. Sketch an appropriate amplifier topology with additional resistors selected to provide the desired result. Your design should utilize the minimum number of amplifiers and resistors. (Hint: In your design, arrange to add currents.)

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