Patent ID: 6934344

Claim:
An automatic gain controller operating on a quadrature modulated communication signal having amplitude modulated and phase modulated components, comprising: a logarithmic detector providing logs of amplitudes of the quadrature modulated signal and a first analog to digital converter for converting the logs of the amplitudes of the quadrature modulated signal into digital values of the logs; the controller characterized by comprising: a limiting amplifier receiving the quadrature modulated communication signal and limiting the quadrature modulated communication signal to produce an output signal; an I and Q demodulator for demodulating the output signal produced by the limiting amplifier into I and Q components; an I analog to digital converter for converting the demodulated I components into digital values of the I components representing chase information of an I portion of the quadrature modulated signal; and a Q analog to digital converter for converting the demodulated Q components into digital values of the Q component representing phase information of a Q portion of the quadrature modulated signal.