In one embodiment of an integrated circuit, the integrated circuit includes a power transistor with a power control terminal, a first power load terminal and a second power load terminal. The PCBA includes a supporting portion and a connecting portion. A first layer of a semi-transparent film having a surface with a first surface area, is formed overlying the substrate surface. The adjusted noise floor level is then used to identify valid echoes in the echo signal and generate an echo signal profile. The present disclosure provides a method of modulating activation and differentiation of CD4+ T cells. A cross-sectional area of the extended portion is greater than that of the connecting portion.