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What is 3dB compression?
The 3 dB Compression Point or P3dB is the power level at which the gain of an amplifier decreases by 3 dB from its ideal linear gain. Once an amplifier reaches its P1dB it goes into compression and becomes a non-linear device, producing distortion, harmonics and intermodulation products.
How is intermodulation reduced?
Prevent Intermodulation Noise Reduce the number of non-linear devices such as diodes, amplifiers in transmitters, and receivers. This can reduce intermodulation products due to antennas and inter-transmitter intermodulation products.
How do you calculate intermodulation?
The order of the intermodulation product depends on how many input signals are mixed and which harmonics of each of those input signals have mixed. Second-order and third-order intermodulation products are defined as follows. 2 f 1 + f 2 = f 6 f 1 + 2 f 2 = f 7 2 f 1 − f 2 = f 8 2 f 2 − f 1 = f 9 .
When does the third order intercept equal the input signal?
The third-order intercept is a theoretical point at which the third-order distortion signal amplitudes equal the input signals. Now if you extend the linear portions of the two gain curves as shown in Figure 3, they will meet at a point where the third-order signals equal the first-order or input signals in amplitude.
What is the slope of third order intercept?
Third Order Intercept Point (IP3): Figure shows both Third order Input Intercept Point and Third Order Output Intercept point with slope of 3. OIP3 = Po + 1/2 (Po – P IMD) IIP3= OIP3 -Gain
Which is the third order intercept point of OIP3?
IIP3 mentioned above is the 3rd order intercept point at the input of the amplifier for OIP3 (Output third Order Intercept point). The figure-2 shows IP2 point. This is result of second order IMD products (i.e. f1+f2 and f1-f2) and second order harmonic frequencies (2*f1, 2*f2).
Which is the third order intercept point on the 1dB curve?
The 1dB curve shows IP 1dB and OP 1dB as Input and output 1dB gain compression points. The extrapolated point where IM3 is equal to 0 dBc is known as the third-order intercept point IP3.