20090279717 | Circuit module for a condenser microphone - A circuit module for a condenser microphone includes a first chip mounted on a mounting surface of a printed circuit board and including an impedance converter circuit for amplifying an electrical signal received from a capacitive sensor via a first conductive pattern on the mounting surface and for outputting an amplified electrical signal. A second chip is mounted on the mounting surface of the printed circuit board, and includes a filtering circuit for filtering the amplified electrical signal received from the first chip via a conductive wire unit and a second conductive pattern on the mounting surface. The first chip and the second chip are further coupled to a ground pattern on the mounting surface. | 11-12-2009 |