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What is Impedance matching

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thinking_smithImpedance matching 
In electrical engineering, impedance is the ratio of voltage to current with the consideration of phase angle.  According to Ohm’s law V= IR, where V – voltage, I is the current and R is the resistance of the network.  In RF, the idea of impedance matching is to equalizing the source and load impedance for maximum power transfer. Impedance is represented as Z and is complex than just the resistance of the network. In simple explanation, impedance matching is to making source and load impedance as similar as possible in order to minimize losses.

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ACLR measurement in LTE

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Our modern digital communication system has been continuously evolving and it demands higher data rate and system efficiency to support millions of individuals around the clock. Since the complexity of the system increases the challenges also increases in designing, testing and implementation of transmission network and user equipment.
Adjacent Channel Leakage Ratio in any RF communication devices are generally described as the unwanted frequency generated by second or third order intermodulation distortion of the devices which fall near to the transmitting frequency band. In modern digital communication, any power leakage from transmitting channel to the adjacent channel cause distortion in other neighboring channel’s transmission and which affects the system efficiency. In order to make sure the system works perfectly within the allowed limits, an ACLR measurement has to be performed with a reference transmit signal.

S-parameters In RF testing – simple explanation

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S-parameters are mathematical representation of energy propagation within a multiport electrical network. It is written as a complex matrix file also knows as scattering parameters. S-parameter file represents full combination of the reflection and transmission parameters in a multiport network with frequency component. It gives an idea of how the DUT behaves with a signal in both forward and reverse direction.

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Inter Modulation Distortion In Passive Devices

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imd_spectrum

Inter Modulation Distortion is one of the important parameter of linearity in every RF and microwave components. Intermodulation happens whenever multiple signals at two or more frequencies interact in any passive or active devices. IMD is one of the significant factor which limiting the system capacity in modern wireless communication system. [Read more…] about Inter Modulation Distortion In Passive Devices