TDMATDMA TDMA TDMA āā " " " " , āā Johnson āā āā1/f āā 1496 Allan Soriano 20065 , āā āāpn pn - āāTDMA""GSM 217Hz 4 āāGSM TDMA BTL R,1 20197019 1. AN-1496 2006 National Semiconductor Corporation AN201970 www.national.com AN-1496 TDMA āā 1 VIN A10dBA1 A2 0dBA2 A2A1180A1A2 VOUT , BTL 2 20197003 2. āāGSMBTL RFI " "TDMAGSMTDMA 800MHz900MHz 1800MHz 1900MHz RF 1A217Hz 0.5ms āā 217Hz"" āā " " 217Hz TDMA ǖ, RFRF RF 3 20197004 3. āā 217Hz RF www.national.com 2 AN-1496 TDMA 20197020 4.RF āā RF RF RF, RFRF ǖ , RF , āā ǖ RFRF RF 90'' RF āā RF āāRF RFRF GSM 900MHz1800MHz 10pF39pF RF RF 4 5LM4845 3dB 1MHz GSM 30dB 3 www.national.com AN-1496 TDMA 20197021 5. āāGSMLM4845 TDMA LM4845 RF LM49466LM48……