SAT_AP720111 Stevens Creek Blvd., #260 Cupertino, CA 95014. U.S.A. Tel: 408.253.3883 Fax: 408.253.6630 Lanwave Technology, Inc. System Application Note AN-7 Audio Section noise reduction methods in SATURN Cordless Phone Design L9002VX / VX2 Code Division Spread Spectrum Telephone Chip Revision: V1.2 Date: April 1999 Lanwave 1999 Page 1 20111 Stevens Creek Blvd., #260 Cupertino, CA 95014. U.S.A. Tel: 408.253.3883 Fax: 408.253.6630 Audio section noise reduction methods Digital Cordless Phone with high power radio design requires special layout precautions to minimizing audio noise due to RF AM coupling and TX/RX switching current change (commonly known as TDD noise). These problems exists in narrow band cordless phones to a smaller degree due to their low radiated power. In digital cordl……