A Low-Power Wideband dB-Linear Variable Gain Amplifier With DC-Offset Cancellation for 60-GHz Receiver

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 C...

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Bibliographic Details
Published in:IEEE access 2018, Vol.6, p.61826-61832
Main Authors: He, Long, Li, Lianming, Wu, Xu, Wang, Zhigong
Format: Article
Language:English
Subjects:
Amplification
Amplifiers
Bandwidth
Bandwidths
Broadband
Circuits
CMOS
dB-linear
DC-offset cancellation
Feedback loop
Feedback loops
Gain
gain flatness
low power
Parasitics (electronics)
Power consumption
Radio frequency
Receivers
Resistors
Transistors
Variable gain
Variable gain amplifier (VGA)
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Summary: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 mm 2 and consumes only 10 mA from a 1.2 V power supply.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2018.2875764