A Circuit Technique for Blocker-Induced Modulated Spur Cancellation in 4G LTE Carrier Aggregation Transceivers
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In this paper, we propose a novel mixed-signal cancellation circuit for LTE carrier aggregation receivers targeting modulated spur interference. This circuit senses interference via an auxiliary analog path, and generates a reference signal for the adaptive digital cancellation. To evaluate the performance of the proposed technique, a demonstrator, realized in 28nm LP CMOS, is shown with a cancellation of over 20 dB and low impact on the main path while consuming 14.3mW. Measurement results show that the receiver?s noise figure is restored to a value within 0.1 dB of the reference value.