A fully integrated highly linear receiver with automatic IP2 calibration schemes for multi-standard applications

This paper presents an entire receiver chain from RF to baseband with fully integrated self-calibration circuitries for suppressing the 2
^nd
-order intermodulation (IM
₂
) distortions in Homodyne receivers for multi-standard applications. All the potential sources for IM
₂
generation are identified and tackled independently in the proposed receiver by architectural and calibration techniques, which results in a very robust IP
₂
enhancement with independency of the amplitude and the frequency of the blockers. The prototype receiver implemented in a 90 nm CMOS process achieves at least 10 dB improvement on the receiver IP
₂
performance at high-power blockers and less than 100 μs calibration cycle for whole receiver chain. It potentially provides truly SAW-Less, fully integrated, and frequency-agile receivers.