Electrical verification of the top level bias block

To run all simulations do “make all”

Loop stability analysis (lstb)

Uses Tian/Middelbrook to check the phase-margin of the RPLY_BIAS circuit

Name Parameter Description   Min Typ Max Unit
Bandwidth f3db   Spec 10.000 150.000 300.000 kHz
      Sch_typ   37.907    
      Sch_etc 23.807 37.686 54.634  
      Sch_3std 26.953 37.881 48.808  
      Sch_std 34.238 37.881 41.523  
Gain Margin gm_db   Spec -50.00 -10.00 -10.00 dB
      Sch_typ   -11.46    
      Sch_etc -14.94 -12.22 -9.27  
      Sch_3std -14.14 -11.71 -9.29  
      Sch_std -12.52 -11.71 -10.90  
DC gain lf_gain   Spec 35.00 40.00 55.00 dB
      Sch_typ   47.57    
      Sch_etc 45.18 47.20 48.75  
      Sch_3std 45.22 47.54 49.86  
      Sch_std 46.76 47.54 48.31  
Phase Margin pm_deg   Spec 45.00 60.00 75.00  
      Sch_typ   49.41    
      Sch_etc 39.48 52.30 60.55  
      Sch_3std 40.51 50.18 59.85  
      Sch_std 46.96 50.18 53.41  
Unity Gain Frequency ug   Spec 3.00 1.50 15.00 MHz
      Sch_typ   8.26    
      Sch_etc 4.66 7.46 11.75  
      Sch_3std 5.82 8.24 10.66  
      Sch_std 7.44 8.24 9.05  
PMOS gate v(lpo)   Spec 0.40 1.00 1.30 V
      Sch_typ   0.79    
      Sch_etc 0.54 0.81 1.12  
      Sch_3std 0.77 0.79 0.82  
      Sch_std 0.78 0.79 0.80  
Diode voltage v(xdut.vd1)   Spec 0.50 1.00 1.30 V
      Sch_typ   0.75    
      Sch_etc 0.58 0.72 0.85  
      Sch_3std 0.74 0.75 0.75  
      Sch_std 0.74 0.75 0.75  
VD Error vdiff   Spec -2.00 0.00 2.00 mV
      Sch_typ   -0.18    
      Sch_etc -2.74 -0.37 1.13  
      Sch_3std -25.76 -1.48 22.80  
      Sch_std -9.58 -1.48 6.61  

Transient analysis (tran)

Check transient operation, and make sure it starts up

Name Parameter Description   Min Typ Max Unit
Delta VD error dvderr   Spec -10.000 0.000 10.000 mV
      Sch_typ   2.019    
      Sch_etc -0.087 2.441 6.022  
      Sch_3std -25.407 1.589 28.584  
      Sch_std -7.410 1.589 10.587  
OTA input offset offset   Spec -10.00 0.00 10.00 mV
      Sch_typ   0.14    
      Sch_etc -1.28 0.27 2.69  
      Sch_3std -25.34 0.17 25.69  
      Sch_std -8.33 0.17 8.68  
Bias current ibp_1u_0   Spec 0.55 0.78 1.09 uA
      Sch_typ   0.78    
      Sch_etc 0.61 0.80 1.00  
      Sch_3std 0.38 0.79 1.19  
      Sch_std 0.65 0.79 0.92  
Bias current ibp_1u_1   Spec 0.55 0.78 1.09 uA
      Sch_typ   0.78    
      Sch_etc 0.61 0.80 1.00  
      Sch_3std 0.34 0.77 1.20  
      Sch_std 0.63 0.77 0.91  
Bias current ibp_1u_2   Spec 0.55 0.78 1.09 uA
      Sch_typ   0.78    
      Sch_etc 0.61 0.80 1.00  
      Sch_3std 0.39 0.80 1.20  
      Sch_std 0.66 0.80 0.93  
Bias current ibp_1u_3   Spec 0.55 0.78 1.09 uA
      Sch_typ   0.78    
      Sch_etc 0.61 0.80 1.00  
      Sch_3std 0.45 0.78 1.11  
      Sch_std 0.67 0.78 0.89  
Active current i_active   Spec 10.00 30.00 50.00 uA
      Sch_typ   26.97    
      Sch_etc 21.62 27.39 34.36  
      Sch_3std 17.97 26.74 35.50  
      Sch_std 23.81 26.74 29.66  
Power down current i_pwrdwn   Spec 0.00 0.00 10.00 nA
      Sch_typ   84.89    
      Sch_etc 60.11 110.02 223.46  
      Sch_3std 83.60 85.07 86.54  
      Sch_std 84.58 85.07 85.56  

Temperature sweep (tsweep)

Temperature sweep to check vref accuracy variation with temperature

Name Parameter Description   Min Typ Max Unit
OTA input offset offset_max   Spec -10.00 0.00 10.00 mV
      Sch_typ   1.36    
      Sch_etc 0.18 1.37 2.69  
      Sch_3std -25.00 1.50 28.00  
      Sch_std -7.33 1.50 10.34  
OTA input offset offset_min   Spec -10.00 0.00 10.00 mV
      Sch_typ   -0.47    
      Sch_etc -1.24 -0.49 0.34  
      Sch_3std -24.46 -1.08 22.30  
      Sch_std -8.87 -1.08 6.72  
Current at 25C ibp   Spec 2.700 3.000 3.300 uA
      Sch_typ   3.116    
      Sch_etc 3.089 3.115 3.143  
      Sch_3std 1.977 3.079 4.181  
      Sch_std 2.712 3.079 3.447  
Temp Coefficient ibp_max_ppm_c   Spec 2400.0 3000.0 3600.0 ppm/C
      Sch_typ   3454.5    
      Sch_etc 3437.3 3455.5 3478.3  
      Sch_3std 2325.7 3523.9 4722.1  
      Sch_std 3124.5 3523.9 3923.3  
Temp Coefficient ibp_typ_ppm_c   Spec 2400.0 3000.0 3600.0 ppm/C
      Sch_typ   3003.5    
      Sch_etc 2981.8 3004.1 3026.3  
      Sch_3std 1883.7 3070.7 4257.8  
      Sch_std 2675.1 3070.7 3466.4  
Temp Coefficient ibp_min_ppm_c   Spec 2400.0 3000.0 3600.0 ppm/C
      Sch_typ   2480.6    
      Sch_etc 2450.2 2482.7 2509.0  
      Sch_3std 1352.1 2551.4 3750.7  
      Sch_std 2151.7 2551.4 2951.2