Patent ID: 11938515
Assignee: INVENSENSE, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  G  H  Y | IPC B  H

Claim 0:
1. A method comprising:
establishing an acceptable range of resonant frequencies (Δf0) for a plurality of piezoelectric micromachined ultrasonic transducer (PMUTs) (500);
providing the plurality of PMUTs such that each PMUT of the plurality thereof includes a membrane (204) that is characterized by a first design that includes a first lateral dimension (D1), a center (C1), and a periphery (P1), wherein each PMUT of the plurality thereof has a resonant frequency that is based on at least one of the stiffness and mass of its respective membrane;
determining a preliminary value (fn-1,1 through fn-M,N) for the resonant frequency of each PMUT of the plurality thereof;
determining a first desired resonant-frequency change for a first PMUT (502-1,1) of the plurality thereof, wherein the first desired resonant-frequency change is based on the acceptable range of resonant frequencies, the preliminary value (fn-1,1) for the first PMUT, and at least one other preliminary value of the plurality thereof; and
imparting the first desired resonant-frequency change on the first PMUT by establishing a first profile of at least one of stiffness and mass along the first lateral dimension of the first membrane (204-1,1).