Reconfigurable multiple input multiple output wideband integrated transceiver with local oscillator distribution circuit

Abstract

Reconfigurable multiple input multiple output wideband integrated transceiver with two transmit, two receive paths and four identical dedicated local oscillation signal PLL synthesizers, is presented. A local oscillator distribution circuit, which interconnects all PLL synthesizers outputs to all transmit and receive path quadrature signal generator inputs and radio frequency signal mixers, is also provided. Proposed transmit and receive path structure, and local oscillator distribution circuit, enables to reconfigure the transceiver for two frequency conversion architecture designs – direct or double frequency conversion. Both frequency conversion architecture designs can be used in either frequency or time division duplex mode. The presented transceiver can be reconfigured for a total of seven different frequency conversion and duplex mode configurations.