.PS cct_init # Usual defs... qrt=dimen_/4; hlf=dimen_/2; dim=dimen_; Op1:opamp(right_,,,4*dim,P) line right_ hlf " $v_o$" ljust_ move to Op1.In1 then down_ dim/8; right_ line from rvec_(-hlf,0) to rvec_(hlf,0) source(down_,I,hlf); llabel(,I_{B_1}) ground(,T) move to Op1.In2 then up_ qrt; right_ line from rvec_(-hlf,0) to rvec_(hlf,0) source(down_,I,hlf);llabel(,I_{B_2}) ground(,T) "\tiny Bias" at (3*dim, -1.5*dim) rjust_ .PE