| Citation: |
Duan Lian, Huang Wei, Ma Chengyan, He Xiaofeng, Jin Yuhua, Ye Tianchun. A single-to-differential low-noise amplifier with low differential output imbalance[J]. Journal of Semiconductors, 2012, 33(3): 035002. doi: 10.1088/1674-4926/33/3/035002
Duan L, Huang W, Ma C Y, He X F, Jin Y H, Ye T C. A single-to-differential low-noise amplifier with low differential output imbalance[J]. J. Semicond., 2012, 33(3): 035002. doi: 10.1088/1674-4926/33/3/035002.
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A single-to-differential low-noise amplifier with low differential output imbalance
doi: 10.1088/1674-4926/33/3/035002
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Abstract
This paper presents a single-ended input differential output low-noise amplifier intended for GPS applications. We propose a method to reduce the gain/amplitude and phase imbalance of a differential output exploiting the inductive coupling of a transformer or center-tapped differential inductor. A detailed analysis of the theory of imbalance reduction, as well as a discussion on the principle of choosing the dimensions of a transformer, are given. An LNA has been implemented using TSMC 0.18 μm technology with ESD-protected. Measurement on board shows a voltage gain of 24.6 dB at 1.575 GHz and a noise figure of 3.2 dB. The gain imbalance is below 0.2 dB and phase imbalance is less than 2 degrees. The LNA consumes 5.2 mA from a 1.8 V supply. -
References
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