At sub-THz frequencies, the local oscillation for transceivers is often generated by an analog frequency multiplier tree. This paper studies the origins and minimization of spurious tones in a local oscillator multiplier consisting of a chain of frequency doublers. It is found that the nearest spurious components depend on the leakage of the input signal in the first multiplier, which can be minimized by active bias tuning, filtering in the first stage or better balance in the driving differential signal. To verify the nonlinearity modeling, 0.13-μm SiGe BiCMOS technology has been utilized.
Nokandi Mostafa Jafari, Pärssinen Aarno, Rahkonen Timo
A4 Article in conference proceedings
Place of publication:
2020 IEEE International Symposium on Circuits and Systems (ISCAS)
28 September 2020
M. J. Nokandi, A. Pärssinen and T. Rahkonen, “A Coherent Spurious Analysis for Sub-THz Frequency Multiplier Chains,” 2020 IEEE International Symposium on Circuits and Systems (ISCAS), Sevilla, 2020, pp. 1-5, doi: 10.1109/ISCAS45731.2020.9181163
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