US 2011/0212747 A1 · DUAL-MODE MOBILE PHONE AND METHOD OF THE SAME FOR INHIBITING GSM/CDMA MUTUAL INTERFERENCE

Abstract

The present invention discloses a GSM/CDMA dual-mode mobile phone and method of the same for inhibiting a GC mutual interference, wherein the mobile phone comprises a dual-port antenna connected respectively with a duplexer and a GSM RF circuit and configured to access the signals of the GSM and the CDMA; a RF switch provided in the CDMA RF receiving circuit, wherein the RF switch is controlled by a GSM baseband chip and configured to cut off a CDMA signal (i.e., cutting off a receiving path of the CDMA) transmitted/received by the dual-port antenna when a GSM operational frequency and a CDMA operational frequency belong to close frequency band during a transmitting timeslot of the GSM, to enhance the isolation between a GSM signal and a CDMA signal. The present invention inhibits interference of GSM transmission with the CDMA receiving in the circuit, achieves high isolation, and also simplifies design of the antennas, lowers requirements of the double antennas on the appearance and volume of the overall machine, and improves the flexibility in the design of the dual-mode mobile phone.

Claims11

Dependent claims

A Global System for Mobile Communication GSM/Code Division Multiple Access CDMA dual-mode mobile phone, comprising:

a CDMA RF circuit, a GSM RF circuit, a baseband circuit comprising a CDMA baseband chip and a GSM baseband chip, with the CDMA RF circuit comprising a CDMA RF receiving circuit, a CDMA RF transmitting circuit and a duplexer, the CDMA RF transmitting circuit being connected respectively with the CDMA baseband chip and the duplexer, the CDMA RF receiving circuit comprising a CDMA receiver, a receiving filter and an LNA (i.e., a Low Noise Amplifier) which are sequentially connected, the CDMA receiver being connected with the CDMA baseband chip, the LNA being connected with the duplexer;
the GSM RF circuit being connected with the GSM baseband chip;
the mobile phone further comprising:
a dual-port antenna, connected respectively with the duplexer and the GSM RF circuit, and configured to transmit/receive signals of the GSM and the CDMA;
and
RF switch(s), provided in the CDMA RF receiving circuit, wherein the RF switch(s) is controlled by the GSM baseband chip and configured to cut off, when the GSM RF and the CDMA RF work at near frequency during a transmitting timeslot of the GSM, CDMA signal(s) accessed by the dual-port antenna.

3 more elements

Dependencies are inferred from the claim text.

Dual-mode mobile phone and method of the same for inhibiting gsm/cdma mutual interference

Life of this patent

Dual-mode mobile phone and method of the same for inhibiting gsm/cdma mutual interference

Life of this patent

Abstract

Claims11