IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543

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An amplifier-doubler chain with conversion gain improvement techniques
Guiheng ZhangWei ZhangJun FuBo Song
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JOURNAL FREE ACCESS Advance online publication

Article ID: 15.20171118

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Abstract

This paper presents an amplifier-douler chain to double the signal frequency from 21GHz to 42GHz with about 10GHz bandwidth of output frequency. For the improvement of conversion gain, the doubler adopts the fully differential Gilbert structure which provides large bandwidth and high conversion gain. Meanwhile, an inductive series LC network is used to form resonant tank with the parasitic capacitor to suppress the second harmonic of input frequency, hence the conversion gain of doubler is improved. Once again, the RLC parallel resonant network is employed as load of doubler and power amplifier, and it can improve bandwidth and conversion gain, too. What’s more, transformer matching networks (TMN) are adopted to optimize the bandwidth and conversion gain of amplifier-douler chain. Finally, the amplifier-douler chain which fabricated by IBM SiGe 0.13μm BiCMOS technology shows 6.1dB conversion gain and -4.1dBm saturation output power with 26.5mA operating current and 2.8V supply voltage, and the fundamental and 3rd harmonic rejection at 42GHz are 17.5dB and 38.6dB, respectively.

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