| 摘要 |
PURPOSE: A clock generation circuit of a CDMA(Code Division Multiple Access) phone is provided to generate double a clock of a digital processor by installing a clock doubler in a clock portion between the digital processor and an SIM card. CONSTITUTION: A digital processor(1) is used for controlling a driving process of an SIM card(3). A level converter(2) is used for binding an auxiliary input terminal(Aux_PCM_Din) with an auxiliary output terminal(Aux_PCM_Dout) of the digital processor(1). In addition, the level converter(2) is connected between input terminals(DIO) of the SIM card(3) in order to perform a buffer function. The SIM card(3) is used for storing various information to protect private information and provide a roaming function between businessmen. A power supply portion(4) is used for electric power to each component. A clock doubler(10) is connected between a clock terminal(Aux_PCM_Clk) of a digital processor(1) and a clock terminal(Clock) of an SIM card(3) in order to generate double a clock of the digital processor(1).
|
