Using Signal Envelope Detection for Online and Offline RF MEMS Switch Testing

Abstract EN

The test of radiofrequency (RF) integrated circuits at their ever-increasing operating frequency range requires sophisticated test equipment and is time-consuming and, therefore, very expensive.

This paper introduces a new method combining low-frequency actuation signal as test stimuli and signal envelope detection applied on the RF output signal in order to provide a low-cost mean for production testing of RF MEMS switches embedded in system-in-package (SiP) devices.

The proposed approach uses the principle of alternate test that replaces conventional specification-based testing procedures.

The basic idea is to extract the high-frequency characteristics of the switch from the signal envelope of the response.

Output parameters like “on” and “off” transition time are extracted at low frequency and used in a regression process to predict RF conventional specifications like S-parameters.

The paper also provides a set of recursive estimation algorithms suitable for online testing.

In this context, “on” and “off” transition time estimated from the output low-frequency envelope is used as test metrics and is concurrently updated using recursive algorithms.

Validation results obtained on a capacitive RF switch model are presented.