CPC G05F 3/205 (2013.01) [G05F 3/262 (2013.01); H01L 27/0629 (2013.01); H01L 27/0802 (2013.01); H01L 28/20 (2013.01); H01L 29/8605 (2013.01)] | 19 Claims |
1. A bias current generator circuit comprising:
a first current path between a supply voltage terminal and a ground level and comprising a series connection of the respective main terminals of a first transistor, a second transistor, and a third transistor;
a second current path between the supply voltage terminal and the ground level and comprising a series connection of the respective main terminals of a fourth transistor and a fifth transistor, and a diffusion resistor;
wherein the diffusion resistor has an upper terminal connected to the fifth transistor, a lower terminal connected in the second current path, and a well contact; the diffusion resistor has a reverse leakage current in response to a voltage at the well contact higher than that at the upper terminal;
a leakage control circuit comprising series connected a sixth transistor and a seventh transistor; wherein the sixth transistor is connected to the supply voltage, and the seventh transistor has a source terminal connected to the well contact of the diffusion resistor to:
apply a driving voltage to the well contact of the diffusion resistor of the second current path; and
allow the reverse leakage current of the diffusion resistor to flow into the leakage control circuit by way of the well contact of the diffusion resistor.
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