3/9/23, 7:04 PM MOSFET DC Operating Point Output MOSFET DC Operating Point Output 1: General MOSFET DC Operating Point Output Quantities Definitions id Channel current ibs B-S bulk-to-source current ibd B-D bulk-to-drain current vgs G-S gate-source voltage vds D-S drain-source voltage vbs B-S bulk-source voltage vth Threshold voltage vdsat Saturation voltage beta Beta value gam eff Gamma effective gm DC gate transconductance gds D-S drain-source conductance gmb B-S bulk-source conductance cdtot Total drain capacitance cgtot Total gate capacitance cstot Total source capacitance cbtot Total bulk capacitance (total floating body capacitance for SOI MOSFET) cgs Total gate- to-source capacitance cgd Total gate- to-drain capacitance The PrimeSim Continuum solution also supports extended DC operating point output using .OPTION EXT_OP=1 or by setting the environment variable ext_op to 1. The extended DC OP output supports MOSFET model Level=49 (BSIM3), Level 54 (BSIM4), Level 69 (PSP), and Level 76 (UTSOI): Name Unit Formulation Description Ide A - Total DC drain current Ige A - Total DC gate current Ise A - Total DC source current Ibe A - Total DC bulk current Total currents Internal currents Ids A - DC Drain current, excluding avalanche, tunnel, GISL, GIDL, and junction currents idb A - DC drain-bulk current isb A - DC source-bulk current V - Drain-Source DC voltage V - Source-Bulk DC voltage V - Gate-Source DC voltage Applied voltages V V V ds sb gs Transconductances Gm A/V δ (ide)/δ (V ) DC transconductance Gmb A/V δ (ide)/δ (V ) DC bulk transconductance Gds A/V δ (ide)/δ (V ) DC output conductance gs sb ds Transcapacitors Cgs F See Transcapacitance AC Gate-Source capacitance, including overlap capacitances Cgd F See Transcapacitance AC Gate-Drain capacitance, including overlap capacitances Csb F See Transcapacitance AC Source-Bulk capacitance https://spdocs.synopsys.com/dow_retrieve/qsc-u/dg/primesim_continuum/U-2023.03/primesim_continuum_olh/primesim_continuum_mosmod/technology_summary_for_hspice_mosfet_models/mosfet_dc_operating_… 1/2 3/9/23, 7:04 PM MOSFET DC Operating Point Output Name Unit Formulation Description Cgb F See Transcapacitance AC Gate-Bulk capacitance Cdb F See Transcapacitance AC Drain-Bulk capacitance Cds F See Transcapacitance AC Drain-Source capacitances Cdg F See Transcapacitance AC Drain-Gate capacitance Csg F See Transcapacitance AC Source-Gate capacitance Csd F See Transcapacitance AC Source-Drain capacitance Cbd F See Transcapacitance AC Bulk-Drain capacitance Cbg F See Transcapacitance AC Bulk-Gate capacitance Cbs F See Transcapacitance AC Bulk-Source capacitance Cgg F See Capacitance AC Gate capacitance. Including overlap capacitances Cdd F See Capacitance AC Drain capacitance Css F See Capacitance AC Source capacitance Cbb F See Capacitance AC Bulk capacitance Capacitors Derived parameters Vth V - Threshold voltage including back bias and drain bias effects Vgt V Vgs - Vth Effective gate drive voltage including back bias and drain bias effects Vdss V - Drain saturation voltage at actual bias Vsat_marg V Vds – Vdss Vds margin Self_gain - Gm/Gds Transistor self gain Rout Ω 1/gds AC output resistor Beff A/(V*V) 2*abs(jide)/(vgt*vgt Gain factor ) Fug Hz Gm/[2 * pi* cgg] Unity gain frequency at actual bias Rgate Ω See Rgate MOS gate resistance Gmoverid 1/V Gm/Ids Gm over Id Vearly V abs(ide)/gds Equivalent early voltage https://spdocs.synopsys.com/dow_retrieve/qsc-u/dg/primesim_continuum/U-2023.03/primesim_continuum_olh/primesim_continuum_mosmod/technology_summary_for_hspice_mosfet_models/mosfet_dc_operating_… 2/2