Abstract
In this article, a new noise reduction/cancellation technique is proposed to improve noise figure (NF) of a broadband low-noise transconductance amplifier (LNTA) for 5G receivers. The LNTA combines a common-gate (CG) stage for wideband input matching and a common-source (CS) stage for canceling the noise and distortion of the CG stage. Yet, another noise reduction is applied to reduce the channel thermal noise of the noise cancellation stage itself. The technique further exploits current reuse and increases transconductance of the CS transistor while keeping its power consumption low. Fabricated in 28-nm CMOS, the proposed LNTA is capable of driving an external 50-Ω load and achieves a NF of 2.09-3.2 dB and input return loss (S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> ) better than -10 dB over the 3-dB bandwidth of 20 MHz-4.5 GHz while consuming 4.5 mW from a single 1-V power supply. The achieved gain (S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> ) and IIP3 are 15.2 dB and -4.6 dBm, respectively.
Highlights
T HE usage of various wireless standards, such as Bluetooth, Wi-Fi, GPS, and 2G/3G/4G/5G cellular, has been continually increasing
Broadband behavior of a wireless receiver is typically defined by its front-end low-noise amplifier (LNA), whose design must consider tradeoffs between input matching, noise figure (NF), gain, bandwidth, linearity, and voltage headroom in a given process technology
We offer a new technique that can be used either as a noise cancellation or as a noise reduction technique without substantially increasing the power consumption
Summary
T HE usage of various wireless standards, such as Bluetooth, Wi-Fi, GPS, and 2G/3G/4G/5G cellular, has been continually increasing. Distributed amplifiers satisfy the required bandwidth for SDRs and optical communications, but they need several parallel stages to simultaneously provide a sufficiently high bandwidth and gain, resulting in high power consumption and large chip area They suffer from high NF due to noise from the gate’s line-termination resistors and losses in the inductors [8]. The aggregate noise performance is limited by the channel thermal noise of the cancellation stage Another architecture in [10] uses current combining as a means to provide noise cancellation in a receiver which cancels the noise due to the antenna input resistance, but the baseband noise of a transimpedance amplifier (TIA) is up-converted to RF and canceled out there.
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