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Frequency multipliers are key components for high quality sinusoidal signal provision in millimeter-wave systems. Suppression of unwanted harmonics is an important challenge, for regulatory reasons, but also since unwanted harmonics can negatively impact system performance. Explicit filtering of fundamental frequency and unwanted harmonics (even interstage in cascaded multipliers), comes at the expense...
This paper presents a novel bootstrapped frequency doubler, which is used to implement a wideband frequency multiplier-by 8 with balanced differential output. In terms of conversion gain, common mode rejection, and output balance, the proposed frequency doubler achieved better performance than the conventional Gilbert-cell frequency doubler by adopting the proposed bootstrapping technique. Wideband...
This paper presents the design and characterization of an ultra wideband FMCW radar sensor. The radar frontend consists of transmitter and receiver chips in SiGe BiCMOS technology with on-chip antennas. Both chips share the same reference chirp signal, multiplied 8 times to the desired operation band. The radar frontend demonstrates a bandwidth of 56.8 GHz from 104.4 GHz to 161.2 GHz, which corresponds...
This paper presents a wideband frequency multiply-by-8 IC for F band FMCW radar application. It combines an active balun, three push-push doubler stages and a buffer stage. The doubler stage uses a transformer for single to differential conversion, with good output balance and compact size. The measured 3 dB output bandwidth of the multiplier is about 30 GHz from 110 GHz to 140 GHz with low harmonics...
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