Abstract :
On 31 March 2014, Distinguished Lecturer Dr. Eric Klumperink presented a seminar at Columbia University, "Cognitive Radio Transceiver Chips," that described his recent cutting- edge research on flexible transmitters, highly linear receivers, and on-chip spectrum analyzers. Utilizing a novel multipath polyphase technique, the presented transmitter was able to suppress unwanted spurs at harmonic frequencies. On the receiver side, Dr. Klumperink presented a technique where negative impedance is introduced at the input of the transimpedance amplifier in current-mode receivers. This improves the in-band linearity of the receiver and, hence, its tolerance to strong interferences. In the last part of the talk, Dr. Klumperink showed the possibility of using crosscorrelation to improve the sensitivity of a spectrum-sensing receiver along with experimental validation from a CMOS prototype.
