| This thesis demonstrates the development of a current-mode system that integrates a front end mixer, an intermediate complex filter and a back end demodulation block, based on the theory of log domain filtering and the technique of state-space synthesis. The unique features of this system involve: (1) it is realized only with BJTs, current sources, capacitors and no op amps; (2) the intermediate complex filter is designed according to a specific state-space description and it integrates a multiple input and multiple output second-order band pass filter that is conveniently and precisely tunable in both Q and fc; (3) the topology of each block and the whole system is implemented with great symmetry, which is preferable in IC layout. |
