Patent ID: 8667353

Claim:
A semiconductor chip comprising: a functional block for generating an oscillating output signal to perform a communication function; an input circuit for selectively supplying a first oscillating test signal supplied from a test device to test the functional block during testing of the functional block and a modulated communication signal during normal operation of the semiconductor chip to the functional block, thereby causing the functional block to generate the oscillating output signal; a first test line through which the first oscillating test signal is supplied from the test device to the input circuit; a test circuit for detecting a first strength, the first strength being a strength of the oscillating output signal, and generating a strength signal indicating the first strength; a signal line for electrically connecting the functional block and the test circuit, thereby causing the oscillating output signal to be supplied from the functional block to the test circuit; a first external terminal for external output of the strength signal; a second external terminal for external output of the oscillating output signal; and a second test line for receiving a second oscillating test signal supplied from the test device and supplying the received second oscillating test signal to the test circuit without passing the input circuit and the functional block, wherein: the test circuit detects the first strength of the oscillating output signal supplied via the signal line and outputs the strength signal indicating the detected first strength to the first external terminal during the testing of the functional block, the test circuit detects a second strength, the second strength being a strength of the second oscillating test signal, generates other strength signal indicating the second strength and outputs the other strength signal to the first external terminal, and the functional block outputs the oscillating output signal to the second external terminal during the normal operation of the semiconductor chip.