MP1S datasheet(10/17 Pages) MITEL

10 / 17 page

SL2017

e) The difference in level in dB between the fundamentals and

the 3rd order products is the IM3 of the device.

f) IP3 may be calculated from the above reading as follows:

IP3 = RF input level + IM3/2.

This level is usually referred to the input.

e.g.

Assuming a measured IM3 of 44dB, and with an input level of

-19dBm,

IP3 = 44/2 + -19dBm = +3dBm

In a 50

Ω system, this may be converted to dBuV by adding 107

to the value calculated since 0dBm = 107dB

µV.

i.e. +3dBm = 110dBuV.

This is known as the input referred IP3 of the device.

If you experience any difficulties with this board, or require

further help, please contact Robert Marsh on 01793 518234

or Fred Herman on 01793 518423. The fax number is 01793

518411.

The in-band ones are listed below:

fd = flo - (2 x f1 - f2)

fc = flo - (2 x f2 - f1)

fd = 1430MHz - (2 x 950MHz - 951MHz) = 481MHz

fc = 1430MHz - (2 x 951MHz - 950MHz) = 478MHz

fundamentals

3rd order product

Measurement of IM3 and IP3

a) Input two signal tones from RF generators. The level of

these should be adjusted so that the device sees an input

signal level of -19dBm from each tone.

Program the local oscillator so that both tones are mixed down

to the IF (approx).

b) Adjust the AGC so that the device gives an overall

conversion gain of +5dB.

c) Connect a spectrum analyser to the selected IF output of

the device.

d) Measure the relative levels of the down converter signals

and the 3rd order products (see diag overleaf).

Two input signals are used:

f1 = 950MHz

f2 = 951MHz

The local oscillator flo is tuned to 1430MHz.

This gives the following at the IF output:

fa = 1430MHz - 950MHz = 480MHz

fb = 1430MHz - 951MHz = 479MHz

Mixing products are also produced in the front end. These

are then downconverted by the mixer.

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