Patent ID: 7346101

Claim:
A spectrum measurement system for measuring a spectrum of a wireless communication device, comprising: a preamplifier for receiving input signals from the wireless communication device and pre-amplifying the input signals; a down converter coupled to the preamplifier for decreasing frequencies of the input signals amplified and generating corresponding intermediate frequency (IF) signals; an IF filter coupled to the down converter for receiving the IF signals generated by the down converter and filtering the IF signals based on a predetermined frequency resolution and a predetermined center frequency; a power meter coupled to the IF filter for measuring powers of the IF signals received from the IF filter; and a personal computer (PC) coupled to the power meter via a first control interface, wherein the first control interface is operative to read the powers measured by the power meter and generate frequencies corresponding to the powers, and the PC is operative to read the frequencies received from the first control interface, convert the frequencies received from the first control interface into real frequencies based on a pre-established calibration table, mark the real frequencies on a frequency axis and the powers on a power axis, and plot a frequency analysis graph with respect to the wireless communication device.