Patent ID: 7671427

Claim:
A film bulk acoustic resonator comprising: a semiconductor substrate; a lower electrode layer having a predetermined first area electrically in contact with a signal line of the semiconductor substrate and another second area spaced by a predetermined height from the semiconductor substrate, the second area being disposed above the semiconductor substrate, the semiconductor substrate being continuously present in the second area; a piezoelectric layer formed on an upper surface of the another second area of the lower electrode layer based on a shape of the lower electrode layer; and an upper electrode layer formed on an upper surface of the piezoelectric layer based on a shape of the piezoelectric layer, wherein at least one of a deposition pressure and a deposition power is controlled to generate an upward stress when depositing the upper electrode layer and the lower electrode layer, and wherein the lower electrode layer, the piezoelectric layer and the upper electrode layer are provided with a pre-generated upward stress.