Patent ID: 7484155

Claim:
An analog base-band (ABB) chipset in a mobile communication system, comprising: a memory configured to store a test pattern and test data; a test control unit configured to generate a test control signal during a test mode; an ABB unit configured to perform a test operation by receiving the test pattern from the memory and to output test data to the memory; and a path selection circuit configured to form a flow path for the test pattern in the ABB unit, wherein the ABB unit comprises: a transmitting digital-to-analog converter (TxDAC) configured to convert transmitted data into an ABB signal; an analog filter configured to filter the ABB signal from the TxDAC to remove harmonic frequencies; a receiving analog-to-digital converter (RxADC) configured to convert a received ABB signal into digital data; and a digital filter configured to filter the digital data output from the RxADC, wherein the path selection circuit comprises: a first multiplexer configured to determine an input of the TxDAC in response to the test control signal; a second multiplexer configured to determine a kind of an input of the analog filter in response to the test control signal; a third multiplexer configured to determine an input of the RxADC in response to the test control signal; and a fourth multiplexer configured to determine an input of the digital filter in response to the test control signal.