Patent ID: 6642803
Filing Date: 2003-11-04
Classification: H03L

Abstract:
A temperature compensated crystal oscillator, comprising:a first layered structure comprising at least one layer and being provided with a cavity formed therein; a second layered structure arranged on an upper surface of the first layered structure, said second layered structure comprising at least one layer and being provided with a cavity formed in a region that does not overlap the cavity of the first layered structure; an IC chip received in the cavity of the first layered structure; a crystal vibrating chip received in the cavity of the second layered structure; a mold portion made of resin received in the cavity of the first layered structure that accommodates the IC chip, said mold portion having a bottom surface flush with a bottom surface of the first layered structure; and a sealing cover arranged on an upper surface of the second layered structure and covering the cavity formed in the second layered structure; wherein the first layered structure comprises two layers, and the cavity of the first layered structure is an integrated cavity formed through the two layers.