Patent ID: 6931554
Filing Date: 2005-08-16
Classification: G06F

Abstract:
1. An add-on card for wireless communication capable of being inserted into a personal digital assistant (PDA) comprising: a rectangular housing having an opening formed on an upper side of the rectangular housing; an interface connector disposed in the opening of the rectangular housing for connecting to the PDA and comprising a DC power terminal for supplying a first direct current (DC); a radio-frequency (RF) circuit enclosed in the rectangular housing, the RF circuit electrically connected to the DC power terminal for receiving the first DC and electrically connected to the interface connector for transmitting an RF signal corresponding to an electrical signal from the interface connector or transmitting an electrical signal to the PDA via the interface connector according to a received RF signal; a power-managing circuit electrically connected to the DC power terminal for storing charges supplied by the first DC and electrically connected to the RF circuit for supplying a second DC to the RF circuit; and wherein when the RF circuit does not transmit the RF signal, the first DC supplies desired power of the RF circuit and charges the power-managing circuit simultaneously, and when the RF circuit transmits the RF signal, the power-managing circuit provides the second DC to the RF circuit and the first DC and the second DC flow into the RF circuit simultaneously for providing the desired power of the RF circuit.