Research on Millimeter-Wave Low-phase-variation Variable-gain Amplifier and Low-noise Amplifier
Date Issued
2012
Date
2012
Author(s)
Lu, De-Ren
Abstract
As the progress of communication techniques and the advance in process technology, the interest in the millimeter-wave band has rapidly grown since the wide bandwidth allows high data transferring rate for short-range wireless applications. In this thesis, a low noise amplifier (LNA) and a variable-gain amplifier (VGA) are implemented in CMOS technology for W-band and V-band, respectively.
In the first part, the W-band LNA, which is an essential component in the receiver, has been designed by TSMC 65-nm 1P9M CMOS process. The circuit is implemented by 4-stage cascode configuration to achieve high gain and wideband performance. This LNA has a peak gain of 25.3 dB at 117.5 GHz, and the gain is better than 20 dB from 75.5 GHz to 120.5 GHz. It features the measured noise figure is from 6 to 8.3 dB from 87 to 100 GHz, OP1dB of -3 dBm, and Psat of 0.5 dBm. The quiescent current of the LNA is 24 mA from 2-V supply voltage.
In the second part, the V-band VGA can be applied in the receiver of a phased-array system. The circuit has been implemented by TSMC 65-nm 1P9M CMOS process and adopted two current-steering stages to achieve variable-gain function. Resonant technique is proposed to cancel the intrinsic capacitor and reduce insertion phase variation while the gain of the VGA is varied. In addition, the noise figure of the VGA can be reduced by using this method simultaneously. A peak gain of 18 dB with a 1-dB bandwidth of 54-62 GHz is measured. In addition, the circuit has a minimum measured NF of 4.4 dB. The insertion phase variation is lower than 6.2° while the gain is varied from 15 dB to 0 dB. The total dc power consumption is 18 mW from 1.8-V supply voltage. A low-phase-variation VGA can not only reduce the complexity of control systems in the phased-array system but also enhance the quality of modulated signals in vector sum modulators.
Subjects
LNA
VGA
CMOS
V-band
W-band
current-steering
phased-array system
Type
thesis
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