Patent ID: 8687827

Claim:
A MEMS microphone chip with an expanded back chamber, comprising: a first chip unit having a first substrate, a vibration membrane layer being formed above a first end of the first substrate, a space being formed below the vibration membrane layer, so that the vibration membrane layer being suspended above the first substrate to vibrate; and a second chip unit having a second substrate to couple with a second end of the first substrate, and a groove being formed in the second substrate, a width of the groove being larger than a width of the space, the groove and the space being connected with each other, when the first substrate and the second substrate being coupled together, the groove and the space being combined together as a back chamber of the vibration membrane layer; wherein the first substrate further includes a pad, and the second substrate includes an application specific integrated circuit (ASIC) and the ASIC is electrically connected to the pad.