Struct JfetModel 

pub struct JfetModel {
    pub vto: f64,
    pub beta: f64,
    pub lambda: f64,
    pub gate_is: f64,
    pub n: f64,
    pub rd: f64,
    pub rs: f64,
    pub cgs: f64,
    pub cgd: f64,
    pub is_n_channel: bool,
}

JFET model parameters in standard SPICE Level 1 parameterization.

Uses VTO (threshold voltage) and BETA (transconductance coefficient) directly from SPICE .MODEL statements rather than the derived Idss.

Fields

vto: f64

Threshold (pinch-off) voltage (V). Negative for N-channel depletion mode.

beta: f64

Transconductance coefficient (A/V²). Ids_sat = BETA × (Vgs - VTO)².

lambda: f64

Channel-length modulation parameter (1/V).

gate_is: f64

Gate junction saturation current (A).

n: f64

Gate junction ideality factor.

rd: f64

Drain ohmic resistance (Ω).

rs: f64

Source ohmic resistance (Ω).

cgs: f64

Gate-source zero-bias junction capacitance (F).

cgd: f64

Gate-drain zero-bias junction capacitance (F).

is_n_channel: bool

True for N-channel, false for P-channel.

Implementations

impl JfetModel

pub fn idss(&self) -> f64

Zero-gate-voltage drain saturation current: Idss = BETA × VTO².

pub fn gate_source_current(&self, vgs: f64) -> f64

Compute gate-source junction diode current.

Igs = IS × (exp(Vgs / (N × Vt)) - 1)

pub fn gate_drain_current(&self, vgd: f64) -> f64

Compute gate-drain junction diode current.

Igd = IS × (exp(Vgd / (N × Vt)) - 1)

pub fn gate_source_conductance(&self, vgs: f64) -> f64

Compute d(Igs)/d(Vgs): conductance of the gate-source junction diode.

dIgs/dVgs = IS / (N × Vt) × exp(Vgs / (N × Vt))

Returns the external-convention derivative (same sign convention as gate_source_current).

Trait Implementations

impl Clone for JfetModel

fn clone(&self) -> JfetModel

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for JfetModel

impl Debug for JfetModel

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.