A 2 Gb/s ΔΣ Directly Driven Wireless Link

One-bit ΔΣ modulation in a wireless transmitter is studied as a potential candidate for multifunction broadband transmit front ends. Characterizing a single ΔΣ modulated transmit element is the first step towards a transmit array for radar/communication applications. A wireless link directly driven by a 2 Gb/s ΔΣ bit sequence is analyzed through simulation and measurement. Effects of clock jitter, asymmetrical rise/fall edges and asymmetrical rise/fall times of the digital signal are studied. A Xilinx Virtex II-Pro FPGA is used to generate the ΔΣ bit sequences. The transmit and receive antennas simultaneously perform bandpass filtering of the noise in the ΔΣ spectrum.