Direct sigma-delta receiver

A sigma delta receiver comprising:

• a first integrator stage to receive an analog radio frequency (RF) signal from an antenna and to generate an analog baseband signal based on the analog RF signal;
• an isolation stage coupled to an output of the first integrator stage, the isolation stage to receive the analog baseband signal from the first integrator stage and to amplify the analog baseband signal;
• a second integrator stage coupled to an output of the isolation stage to receive the analog baseband signal, to further amplify the analog baseband signal, wherein the second integrator stage comprises an amplifier and a feedback capacitor that is connected in parallel with the amplifier, wherein the amplifier has a positive input terminal and a negative input terminal, and wherein the positive input terminal is connected to the ground;
• and
• a quantization stage coupled to an output of the second integrator stage to convert the analog baseband signal to a digital signal, and to output the digital signal.