Struct VariMuThreePort 

pub struct VariMuThreePort {
    pub model: VariMuModel,
    /* private fields */
}

3-port variable-mu triode for use with the grouped multi-port NR solver.

Presents 2 WDF ports to the R-type adaptor:

• Port 0: grid-to-cathode (grid conduction diode)
• Port 1: plate-to-cathode (Raffensperger plate current, depends on Vgk)

The grid voltage is no longer an external parameter — it comes from the grid port of the R-type adaptor, which connects to the grid-side passive network (threshold pots, bias resistors, etc.).

Grid current model: i_g = I_gs × (exp(V_gk / V_tg) - 1) This is essentially zero for Vgk < 0 (normal operation) and models forward grid conduction for Vgk > 0.

Plate current: Raffensperger equation (same as VariMuTriodeRoot) Ia = p1 × Vak^p2 / ((p3 - p4×Vgk)^p5 × (p6 + exp(p7×Vak - p8×Vgk)))

The cross-derivative ∂Ia/∂Vgk (transconductance) is: ∂Ia/∂Vgk = Ia × (p4×p5/D_base + p8×exp_term/(p6 + exp_term)) where D_base = p3 - p4×Vgk.

Fields

model: VariMuModel

Implementations

impl VariMuThreePort

pub fn new(model: VariMuModel) -> VariMuThreePort

pub fn new_with_v_max(model: VariMuModel, v_max: f64) -> VariMuThreePort

pub fn new_gnd_referenced( model: VariMuModel, supply_voltage: f64, ) -> VariMuThreePort

Create a VariMuThreePort for use in a GND-referenced MNA context.

VariMuThreePort evaluates vak = v[1] directly (no voltage offset), so this is equivalent to new_with_v_max — the supply voltage sets the upper plate-voltage clamp only.

pub fn with_parallel_count(self, count: usize) -> VariMuThreePort

pub fn set_v_max(&mut self, v_max: f64)

pub fn v_max(&self) -> f64

pub fn parallel_count(&self) -> usize

Trait Implementations

impl Clone for VariMuThreePort

fn clone(&self) -> VariMuThreePort

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for VariMuThreePort

impl Debug for VariMuThreePort

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

Formats the value using the given formatter.

impl NlDeviceGroupIv for VariMuThreePort

fn n_ports(&self) -> usize

Number of ports in this device group.

fn eval(&self, v: &[f64], currents: &mut [f64], jacobian: &mut [f64])

Evaluate currents and full Jacobian for all ports.

fn v_clamp_port(&self, port: usize) -> (f64, f64)

Voltage clamp bounds for a specific port.

fn limit_port_voltage(&self, _port: usize, v_new: f64, _v_old: f64) -> f64

SPICE-style junction voltage limiting (pnjlim) hook.