In the LF155 BiFET op-amp in Figure 13.25, the combination of Q3, J6 and Q4 establishes the reference bias current. Assume the power supply voltages are V + = 10 V and V - = -10V. The transistor parameters are VEB(on) = 0.6 V, VBE(on) = 0.6 V, and VP = 4 V for Q3, Q4 and J6, respectively. Determine the required IDSS value for J6 to establish a reference current of IREF =g 0.8 mA.
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