Abstract: A method (1100) and a mobile station (160) for operating in accordance with a discontinuous transmission mode are described herein. The mobile station (160) may include a first time constant generator (340), a second time constant generator (350), and a logic unit (330). The first time constant generator (340) may generate a first time constant in response to a first command from the logic unit (330) whereas the second time constant generator (350) may generate a second time constant in response to a second command from the logic unit (330). The first time constant is greater than the second time constant, which in turn, is associated with the discontinuous transmission mode.

Abstract: This invention is a method of carrier suppression tuning of a wireless communication device (100) utilizing a quadrature modulator (104) in a transmission path (102). A power detector (128) and a processor (132) are coupled to the ends of the transmission path (102) to provide feedback to the quadrature modulator (104) and, thus, minimizes carrier feedthrough. For this invention, the transmission path (102) of the device (100) is enabled and “I” and “Q” DC offset values are set to default values. Then, output voltages from the power detector (128) are sampled and the “I” DC offset value is adjusted based on the sampled voltages. Similarly, output voltages from the power detector (128) are sampled and the “Q” DC offset value is adjusted based on the sampled voltages.

Abstract: This invention is a method of carrier suppression tuning of a wireless communication device (100) utilizing a quadrature modulator (104) in a transmission path (102). A power detector (128) and a processor (132) are coupled to the ends of the transmission path (102) to provide feedback to the quadrature modulator (104) and, thus, minimizes carrier feedthrough. For this invention, the transmission path (102) of the device (100) is enabled and “I” and “Q” DC offset values are set to default values. Then, output voltages from the power detector (128) are sampled and the “I” DC offset value is adjusted based on the sampled voltages. Similarly, output voltages from the power detector (128) are sampled and the “Q” DC offset value is adjusted based on the sampled voltages.

Abstract: The dual mode amplifier network of the present invention enables a radiotelephone to operate efficiently in both the U.S. Digital Cellular mode and the FM analog cellular mode. Multiple, switched branches (110 and 120) permit one branch (110) with an isolator (103) to be used in the in the U.S. Digital Cellular mode while the other branch (120) is switched out. In the analog mode, the transmit filter branch (120) is used while the isolator branch (110) is switched out.