arXiv:2611.09508v1 Announce Type: new Abstract: A spiking model, called the High-Pass (HP) model, has recently been proposed as a minimal excitable primitive. This model is composed of a static activation function, usually a sigmoid, in positive feedback with a high-pass filter. The HP model enters a tonic spiking regime whenever its input lies in the high-gain zone of the sigmoid, where the sigmoid's slope exceeds 1. In neuroscience, the frequency-current (FI) curve is the standard way of characterizing the tonic spiking regime of a neuron. So far, the FI curve of the HP model has been characterized analytically only for specific sigmoids, and has otherwise been computed through simulation. These simulations are computationally heavy, since simulating neurons requires solving a stiff system of differential equations. This paper bridges this gap by analytically characterizing the FI curve of the HP model with a first-order high-pass filter, for a broad class of sigmoid functions. The FI curve of the first-order HP model can be computed by solving two input-independent equations and evaluating two input-dependent integrals, with no need to simulate the model itself. A spiking primitive is said to be Type I (resp. Type II) if tonic spiking starts at a zero (resp. non-zero) frequency. This paper also shows that, for the HP model, the type depends solely on the local shape of the sigmoid at the outer edges of its high-gain zone. A sharp corner, where the derivative approaches a value strictly smaller than 1 from the outside, yields a Type I primitive. A locally twice differentiable corner, with a bounded second derivative and a derivative approaching 1 at the edge, yields a Type II primitive.