Patent ID: 6167244
Filing Date: 2000-12-26
Classification: H03G,H04L

Abstract:
A gain control method used for controlling the gain of a receiver including an attenuator for attenuating an input signal depending upon each of a first set value and a second set value, an amplifier for amplifying said input signal depending upon a control signal, and a controller for generating the first set value, the second set value, and the control signal, said gain control method comprising the steps of:separately attenuating said input signal using said first set value to obtain a first attenuated input signal, and using said second set value to obtain a second attenuated input signal, and determining a control error of each of said first and second attenuated input signals;deciding whether a receive level of said input signal falls in a first control error range corresponding to the first set value or a second control error range corresponding to the second set value by comparing the control error of the first attenuated input signal with said first control error range, and comparing the control error of the second attenuated input signal with said second control error range; andthereafter controlling the gain by attenuating an input signal in the attenuator using the first set value when it is decided in the decision step that the receive level falls in the first control error range and using the second set value when it is decided that the receive level falls in the second control error range, and amplifying an input signal in the amplifier.