US 11,709,517 B2
Bias current generator circuit
Jiawei Fu, Suzhou (CN); Jianzhou Wu, Suzhou (CN); Jie Jin, Suzhou (CN); Yikun Mo, Suzhou (CN); and Stefano Pietri, Austin, TX (US)
Assigned to NXP USA, Inc., Austin, TX (US)
Filed by NXP USA, Inc., Austin, TX (US)
Filed on Mar. 10, 2021, as Appl. No. 17/249,717.
Claims priority of application No. 202010173143.8 (CN), filed on Mar. 12, 2020.
Prior Publication US 2021/0286389 A1, Sep. 16, 2021
Int. Cl. G05F 3/20 (2006.01); G05F 3/26 (2006.01); H01L 29/8605 (2006.01); H01L 27/08 (2006.01); H01L 27/06 (2006.01); H01L 49/02 (2006.01)
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
OG exemplary drawing
 
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.