In the paper 'A Wideband CMOS Variable Gain Amplifier With an Exponential Gain Control',a Voltage-to-Current Converter is realized and the structure is shown in the following figure。 ) I: C s$ N1 ~7 V / G5 m/ ?& t* i% \/ _2 k/ Q' j
In the figure,VC** denotes the voltage copier and current generation,Here ,i don't understand why VC** can copy voltage from node A to node B。; ]/ A& z6 ], R2 l/ {" D; s
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Could anybody explain it? thank you。