Tag: RF
What is RRH (Remote Radio Head), How it is connected to BBU (Base Band Unit) ?
The remote radio head (RRH) contains the base station’s RF circuitry plus analog-to-digital or digital-to-analog converters and up/down converters. It is sitting on top of cell tower that mainly performs […]
What are E-UTRA Test Models (E-TM) in LTE ?
The E-UTRA test models (E-TM) are set of signals defined by 3GPP for the radio frequecy standard testing of LTE device (it may be eNodeB or UE) transmitter chain. The […]
What is Skin Depth, Why it matters in Radio Frequencies ?
Skin depth is a measure of how far electrical conduction takes place in a conductor, and is a function of frequency. At DC (0 Hz) the entire conductor is used, no […]
What is SAW Filter ?
A Surface Acoustic Wave filter, or SAW filter is a filter whereby the electrical input signal is converted to a acoustic wave by so-called interdigital transducers (IDTs) on a piezoelectric […]
RF Sampling, making smaller base station for 3G, 4G, 5G Systems
“RF sampling” is the technology of digitizing an RF signal with an ADC directly, without an analog frequency conversion to a lower IF (intermediate frequency) or baseband (Zero IF) before […]
dB , dBm Terminology
I keep seeing people using the terms “dB” and “dBm”, interchangeably, when they actually mean very different things. So, here’s a little background on the correct usage of the terms. […]
Radio Frequency Bands
Radio frequency (RF) is any of the electromagnetic wave frequencies that lie in the range extending from around 3 kHz to 300 GHz. Following is the radio frequency spectrum table divided in different bands: S/N Designation […]
1dB Compression Point (P1dB Point)
When operating in the linear region of a device (such as power amplifier, mixer etc.), gain through that device is constant. As the input power is increased, a point is […]
VSWR
Impedance mismatches in a radio-frequency (RF) electrical transmission line cause reflection of rf power and thus power loss. VSWR is a way to measure transmission line imperfections. VSWR stands for Voltage […]
Mobile Phone Architecture
When we say a mobile, it is not just a piece of plastic/metallic body, as it looks from outside, there are lots of different components/modules inside that mobile. This article […]