What is IIP3?

What is IIP3?

The terms IIP3 and OIP3 stands for Input Third Order Intercept Point and Output Third Order Intercept Point respectively. Introduction: When two or more than two signals are mixed in nonlinear component whether active or passive, other signals get generated as a result of product of these original signals.

What is RF Cascade?

An RF chain is a cascade of electronic components and sub-units which may include amplifiers, filters, mixers, attenuators and detectors. The key electrical parameters for an RF chain are system gain, noise figure (or noise factor) and overload level.

What is RF cascade analysis?

What is cascade analysis? Cascade analysis is a simple yet powerful tool for analyzing system performance. You can analyze small-signal gain and noise figure nearly exactly, and come pretty close to modeling large-signal performance, such as predicting one-dB compression point.

Why is IIP3 important?

Why IIP3 is measured in Receiver Chain And few of them causes IMDs in desired band. Thus it becomes very important to measure the 3rd order Input Intercept Point (IIp3) of the receiver to make sure how much IMD levels it produces which effects the SNR.

Is higher IIP3 better?

Reading the value from the input axis, the value is IIP3. The higher the output at the intercept, the better the linearity and the lower the IMD. The IP3 value essentially indicates how large a signal the amplifier can process before IMD occurs.

What is IIP3 in LNA?

A low-noise amplifier (LNA) that achieves high third-order input intercept point (IIP3) at RF frequencies using a nonlinearity cancellation technique is proposed. The circuit tackles the problem of the effect of the second-order nonlinearity on IIP3 at RF frequencies.

What is an RF chain 5G?

5G consists of two separate frequency bands, FR1 is mostly repurposed LTE bands and FR2 bands are in the mmWave region. As a result, 5G in the FR1 frequencies can use a zero-IF (or direct) conversion radio architecture like the one that is currently used in LTE cell phones, Bluetooth, and similar devices.

How is P1dB calculated?

A well-known rule-of-thumb is to subtract 10 to 15 dB to the IP3 value to estimate the P1dB value.

What is the 1 dB compression point?

The 1 dB compression point is therefore defined as the RF input power required to cause the conversion loss to increase by 1 dB. This compression point is the maximum recommended RF input power to the mixer.

How do I increase my IIP3 LNA?

there are several methods to improve IP3 or linearity:

1. increase bias.
2. increase Vgs.
3. decrease gain.
4. decrease input signal amplitude.
5. new schematic topology.

How is IP2 calculated?

Using the IM2 data presented in the earlier graph, the IP2 is calculated according to IP2 = 2(Pin ) – IM2ACRMS for the two-tone test, and IP2 = 2(Pin ) – (IM2DC + 3 dB) for the one-tone test.

How to calculate the cascaded value for IP3?

Calculating the cascaded values for 3rd-order intercept point (IP3) for the system budget requires use of ratios for gain and power levels for IP3 (do not use dB and dBm values, respectively). The standard format for indicating decibel values is to use upper case letters; i.e., IP3 for units of dBm.

Which is higher IP3 or IIP3 or OIP3?

The input intercept point is referred as IIP3 and output intercept point is referred as OIP3. IP3 is usually 10dB higher than the 1dB compression point of the nonlinear RF device. Following equation or formula is used for Cascaded IP3 Calculator.

Where do I see the results of a cascade analysis?

Every time you enter a number, you will see the results in the “Output” section self-update. When you’re done entering data, your system cascade analysis will be complete and ready for printing. To start over, hit “Clear Values”. This button will remove the values you entered from all stages.

When to consider cascaded response in RF circuit design?

When reviewing an integrated RF frequency mixer data sheet, the RF circuit designer must consider the equivalent cascaded response of the individual discrete stages in a passive design in order to make a fair comparison to Maxim’s integrated mixers.