the main amplifier core circuit 106 and to a gate of a main current transistor mp77 the gate of the current switch mn73 is coupled to the biasing circuit 102 the source of the current switch mn73 is coupled to the source of a current switch mn74 the drain of the current switch mn74 is coupled to the voltage supply vdd the gate of the current switch mn74 is coupled to a clock clk the clock clk is coupled to ground 108 and to a voltage source v13 the voltage source v13 is also coupled to ground 108 the drain of the main fixed current source mn72 is coupled to the sources of the current switches mn73 and mn74 the gate of the main fixed current source mn72 is coupled to the biasing circuit 102 the gate and the source of the main fixed current source mn72 is coupled to the biasing circuit 102 0040 fig3 is the op amp 100 showing only the dynamic current switching circuit 104 and the main amplifier core 106 in greater detail referring to fig2 and fig3 simultaneously the main amplifier core circuit 106 includes two common gate pmos current sources mp24 mp25 the gate of the pmos current source mp24 and the gate of the pmos current source mp25 are coupled to the biasing circuit 102 by the voltage bias vbiasp the drain of the pmos current source mp24 is coupled to the drain of the main current transistor mp76 the source of the pmos cascode mp31.