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 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 […]

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 […]


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 […]