A wideband inductorless dB-linear automatic gain control amplifier using a single-branch negative exponential generator for wireline applications
This paper reports a wideband inductorless automatic gain control (AGC) amplifier for wireline applications. To realize a dB-linear AGC range, a pseudo-folded Gilbert cell driven by a single-branch negative exponential generator (NEG) is proposed as the core variable-gain amplifier. The NEG features...
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| Main Authors: | , , , , |
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| 其他作者: | |
| 格式: | Article |
| 語言: | English |
| 出版: |
2020
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| 主題: | |
| 在線閱讀: | https://hdl.handle.net/10356/141113 |
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| 總結: | This paper reports a wideband inductorless automatic gain control (AGC) amplifier for wireline applications. To realize a dB-linear AGC range, a pseudo-folded Gilbert cell driven by a single-branch negative exponential generator (NEG) is proposed as the core variable-gain amplifier. The NEG features a composite of dual Taylor series to extend the AGC approximation range without sacrificing the precision. Fabricated in 65-nm CMOS, the AGC amplifier occupies a tiny die area of 0.045 mm 2 and consumes 28 mW at 1.2 V. Measured over a dB-linear gain range of ~40 dB, <; ± 1 dB gain error is achieved and the 3-dB bandwidth stays roughly constant at 7 GHz. For the closed-loop AGC measurement, the input dynamic range is ~40 dB (10 mVpp to 1 Vpp) for a BER <;10 -12 under a 2 7 - 1 PRBS data at 10 Gb/s. The achieved figure-of-merit (FOM) of 2.8 pJ/bit compares favorably with state-of-the-art. |
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