Method for measuring system noise figure of a mobile communication (CDMA) receiver including an automatic gain control (AGC) circuit

摘要

(A ", b", c ") of a frequency down-converter output signal including AGC (a, b, c) after inputting a signal and noise including a carrier using an RF signal generator 501, And the noise figure is obtained by obtaining the signal-to-noise ratio. The present invention allows the receiver to have a high gain because the frequency divider itself does not require a separate amplifier, and a low ENR Noise amplifier having a gain of about 20dB at the front end of the frequency divider is not required. In addition, in the case where the low noise amplifier is located at the rear end of the low noise amplifier, Since the measurement error on the total system noise figure is reduced to about 1/100, the error occurring in the measurement does not significantly affect the noise figure of the entire system.