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(a) Large supply drop across the 8 mm long shank changes the bias voltage, ΔVb. This is due to the high current in the supply rail (consumed by all PAs), that causes voltage drop within a bias region (ΔVDDG); (b) a tree-like power supply ensures that supply change ΔVDL is close to zero within each region, due to the lower current in the local rail. Each region contains its dedicated local bias generator.
