Patent ID: 7113760

Claim:
A receiver circuit comprising the following: a first direct conversion receiver configured to generate a first in-phase differential signal and a first quadrature-phase differential signal that are at least derived from a baseband signal; a first in-phase amplifier configured to receive and amplify the first in-phase differential signal; a first in-phase summer configured to receive and sum the amplified first in-phase differential signal; a first quadrature-phase amplifier configured to receive and amplify the first quadrature-phase differential signal; a first quadrature-phase summer configured to receive and sum the amplified first quadrature-phase differential signal, the summed first in-phase signal and the summed first quadrature-phase signal representing a first differential baseband-derived signal; a first log amplifier configured to receive the first differential baseband-derived signal and generate a signal that is approximately proportional to a log of the amplitude of the first differential baseband-derived signal; a second direct conversion receiver configured to generate a second in-phase differential signal and a second quadrature-phase differential signal that are at least derived from a baseband signal; a second in-phase amplifier configured to receive and amplify the second in-phase differential signal; a second in-phase summer configured to receive and sum the amplified second in-phase differential signal; a second quadrature-phase amplifier configured to receive and amplify the second quadrature-phase differential signal; a second quadrature-phase summer configured to receive and sum the amplified second quadrature-phase differential signal, the summed second in-phase signal and the summed second quadrature-phase signal representing a second differential baseband-derived signal; a second log amplifier configured to receive the second differential baseband-derived signal and generate a signal that is approximately proportional to a log of the amplitude of the second differential baseband-derived signal; and an amplitude summer configured to receive and sum the first and second differential baseband-derived signals.