A Low-Power Wideband dB-Linear Variable Gain Amplifier With DC-Offset Cancellation for 60-GHz Receiver
A Low-Power Wideband dB-Linear Variable Gain Amplifier With DC-Offset Cancellation for 60-GHz Receiver
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适用于 60 GHz 接收器的具有 DC 偏移消除功能的低功耗宽带 dB 线性可变增益放大器
DOI：
10.1109/access.2018.2875764
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Wang Zhigong
中科院分区：
文献类型：
--
作者：
He Long;Li Lianming;Wu Xu;Wang Zhigong
This paper presents a two-channel (I+Q) variable gain amplifier (VGA) for low power 60-GHz wireless receiver. The VGA consists of four-stage gain cells, an efficient DC-offset cancelling circuit and an output buffer for test purposes. To achieve wide bandwidth and low power consumption, a modified Cherry—Hooper amplifier gain cell is used. With a tunable transistor and its parasitic capacitance, a dB-linear characteristic and a flat gain response are achieved without any additional exponential circuit. The DC-offset is cancelled effectively with two proposed feedback loops. The measurement results show that the VGA achieves a gain range of 6 to 44 dB, an OP1dB of 1 dBm, and a 3-dB bandwidth of over 1 GHz with an excellent flat gain response. Fabricated in a 65-nm CMOS technology, the two-channel VGA core occupies a silicon area of only 0.055 mm2 and consumes only 10 mA from a 1.2 V power supply.
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