A Versatile 10–80-Gb/s PRBS-Based Broadband Transmitter With Arbitrary 20–60-GHz Spectrum Shifting

A versatile pseudorandom bit sequence (PRBS)-based transmitter with the ability to mix the generated PRBS spectrum to arbitrary frequencies is presented. It incorporates a 2
¹¹
-1 80-Gb/s PRBS generator, employing parallel architecture. The generator is optimized to provide a high bit rate as well as a long sequence length for low power consumption without any need of inductive peaking, compared with the PRBS generators reported in the literature. The PRBS generator is capable of generating bit rates ranging from 10 up to 80 Gb/s. The transmitter can shift the generated PRBS spectrum to arbitrary frequencies ranging from 20 to 60 GHz via a broadband mixer of a double sideband output spectrum of 80-GHz bandwidth. A radar is realized using the presented transmitter, where a range resolution of 7.5 mm could be achieved. The transmitter consumes power ranging from 576 mW to 1 W, depending on the output bit rate of the integrated PRBS generator. The proposed circuit was manufactured in an 0.35-μm SiGe technology with an f
_t
of 200 GHz.