DBm

Summary

dBm or dBmW (decibel-milliwatts) is a unit of level used to indicate that a power level is expressed in decibels (dB) with reference to one milliwatt (mW). It is used in radio, microwave and fiber-optical communication networks as a convenient measure of absolute power because of its capability to express both very large and very small values in a short form. dBW is a similar unit, referenced to one watt (1,000 mW). The decibel (dB) is a dimensionless unit, used for quantifying the ratio between two values, such as signal-to-noise ratio. The dBm is also dimensionless, but since it compares to a fixed reference value, the dBm rating is an absolute one. The dBm is not a part of the International System of Units (SI) and therefore is discouraged from use in documents or systems that adhere to SI units (the corresponding SI unit is the watt). However, the unit decibel (dB), without the 'm' suffix, is permitted for relative quantities, but not accepted for use directly alongside SI

Official source

https://en.wikipedia.org/wiki/DBm

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Related lectures

A 49 mu W 6th-Order Chebyshev SSF-based Low-Pass Analog Filter for IEEE 802.11ax

Daniel Mathias Bold, Salvatore Collura, Christian Enz, Alessandro Pezzotta

In this paper a continuous-time low-pass analog filter based on the Cascoded Super Source Follower (C-SSF) architecture, implemented in a 28-nm bulk CMOS process, is presented. The target application is the transceiver analog baseband for the next-generation IEEE 802.11ax WiFi standard. To comply with the high-selectivity requirements, a 6th-order Chebyshev transfer function has been implemented as a cascade of three biquadratic cells. The high quality factors required by such topology have been achieved by cascoding the feedback transistor in the standard SSF cell, reducing the quality factor dependence on the output conductance of the source follower transistor. Designed with the Inversion-Coefficient (IC) methodology, the filter is able to operate for channel bandwidths ranging from 10 MHz to 20 MHz by changing its bias current. Measurement results show that the filter has a minimum noise power of -55.1 dBm and a maximum IIP3 of 14 dBm consuming 49 mu W, i.e. 8.17 mu W per pole, occupying an area of 0.0099 mm(2).

IEEE2020

Design of a Passive UHF RFID Tag for Capacitive Sensor Applications

Catherine Dehollain, Kerem Kapucu

In this work, the design of a passive UHF RFID tag for sensor applications is described. The system level design issues are discussed taking into account the possible operation scenarios. Among the blocks in the tag, the emphasis is on the design of the rectifier and the capacitive sensor interface. The three-stage, differential-input rectifier is designed to generate the supply voltage with input levels as low as -13 dBm. The power conversion efficiency of the rectifier is 70%, driving a 30 kΩ load at -13 dBm source power. The fully-digital capacitive sensor interface designed to operate with a humidity sensor, can work with supply voltages as low as 0.8 V with good linearity and a power consumption of 12 μW. The tag is capable of getting linear sensor readout under input power levels as low as -9 dBm. The circuits are implemented in 0.18 μm UMC CMOS process.

IEEE2013

In this work, the design of a passive UHF RFID tag for sensor applications is described. The system level design issues are discussed taking into account the possible operation scenarios. Among the blocks in the tag, the emphasis is on the design of the rectifier and the capacitive sensor interface. The three-stage, differential-input rectifier is designed to generate the supply voltage with input levels as low as -13 dBm. The power conversion efficiency of the rectifier is 70%, driving a 30 k Omega load at -13 dBm source power. The fully-digital capacitive sensor interface designed to operate with a humidity sensor, can work with supply voltages as low as 0.8 V with good linearity and a power consumption of 12 mu W. The tag is capable of getting linear sensor readout under input power levels as low as -9 dBm. The circuits are implemented in 0.18 mu m UMC CMOS process.

Ieee2013