Week 09

The three parameters to be analysed along with transmitter and receiver parts separately are gain, noise figure and IP3.

"Complete wireless design" by Cotter W. Sayre was referred in order to understand those parameters.

1. Noise figure

Noise figure is a figure of merit quantitatively specifying how noisy a component or system is. The

noise figure of a system depends on a number of factors such as losses in the circuit, the solid-state

devices, bias applied, and amplification. The noise factor of a two-port network is defined as,

The noise figure for a receiver can be calculated by using Friis’s equation, with the noise figure

itself not needing to be referenced to any particular bandwidth.

2. The third-order intercept point (IP3) is approximately 10 to 15 dB above the P1dB compression

point, and is the location where, if the gain slope of the receiver could continue, the undesired

output third-order frequency products would be at the same amplitude as the output two-tone

fundamental test signals that had been originally placed at the receiver’s input.

Google Sites

Report abuse