Patent ID: 6728517
Filing Date: 2004-04-27
Classification: H03D,H04B

Abstract:
A multiple-input multiple-output (MIMO) radio transceiver comprising:a. a receiver comprising at least first and second receiver circuits each to process a signal from a corresponding one of first and second antennas, i. the first receiver circuit comprising: 1. a first downconverter coupled to the first antenna to downconvert a first receive signal detected by the first antenna to produce a first baseband signal; and 2. a first lowpass filter coupled to the first downconverter that lowpass filters the first baseband signal; ii. the second receiver circuit comprising: 1. a second downconverter coupled to the second antenna to downconvert a second receive signal detected by the second antenna to produce a second baseband signal; and 2. a second lowpass filter coupled to the second downconverter that lowpass filters the second baseband signal; b. a transmitter comprising at least first and second transmitter circuits each of which processes a signal to be transmitted by a corresponding one of the first and second antennas, i. the first transmitter circuit comprising: 1. a first upconverter that upconverts a first baseband analog signal to generate a first RF signal; 2. a first bandpass filter coupled to the output of the first upconverter that filters the first RF signal; and 3. a first power amplifier coupled to the output of the bandpass filter that amplifies the filtered RF signal to produce a first amplified signal that is coupled to the first antenna for transmission; ii. the second transmitter circuit comprising: 1. a second upconverter that upconverts a second baseband analog signal to generate a second RF signal; 2. a second bandpass filter coupled to the output of the second upconverter that filters the second RF signal; and 3. a second power amplifier coupled to the output of the second bandpass filter that amplifies the second filtered RF signal to produce a second amplified signal that is coupled to the second antenna for transmission.