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ELECTRIC FIELDS CONVERSION

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1 dB COMPRESSION POINT (P1dB)

 

Active components are limited to the amount of power that can be provided. When operating within the linear region of the component, gain through the component is constant for a given frequency. As the input signal is increased in power, a point is reached where the power of the signal at the output is not amplified by the same amount as the smaller signal. At the point where the input signal is amplified by an amount 1 dB less than the small signal gain, the 1 dB Compression Point has been reached. A rapid decrease in gain will be experienced after the 1 dB compression point is reached. If the input power is increased to an extreme value, the component will be destroyed.

Passive, nonlinear components such as diodes also exhibit 1 dB compression points. Indeed, it is the nonlinear active transistors that cause the 1 dB compression point to exist in amplifiers. Of course, a power level can be reached in any device that will eventually destroy it.

P1dB{output} = [P1dB{input} + (Gain - 1)] dBm

Cascading of 1 dB Compression points is not a straightforward process, since the curve followed from linear operation into saturation is dependent upon the circuit characteristics.

ELECTRIC FIELDS CONVERSION

These formulas are valid for a 50 W system.

Volts dBV dBmV Watts dBW dBm dBmA
1 000 60.0 180.0 20 000 43.0 73.0 146.0
750 57.5 177.5 11 250 40.5 70.5 143.5
500 54.0 174.0 5 000 37.0 67.0 140.0
250 48.0 168.0 1 250 31.0 61.0 134.0
200 46.0 166.0 800 29.0 59.0 132.0
100 40.0 160.0 200 23.0 53.0 126.0
75 37.5 157.5 113 20.5 50.5 123.5
50 34.0 154.0 50 17.0 47.0 120.0
25 28.0 148.0 12.5 11.0 41.0 114.0
20 26.0 146.0 8.00 9.03 39.0 112.0
10 20.0 140.0 2.00 3.01 33.0 106.0
7.5 17.5 137.5 1.13 0.51 30.5 103.5
5.0 14.0 134.0 0.50 -3.01 27.0 100.0
2.5 7.96 128.0 0.125 -9.03 21.0 94.0
2.0 6.02 126.0 0.080 -11.0 19.0 92.0
1.0 0.00 120.0 0.020 -17.0 13.0 86.0
0.75 -2.50 117.5 1.1x10-2 -19.5 10.5 83.5
0.50 -6.02 114.0 5.0x10-3 -23.0 6.99 80.0
0.25 -12.0 108.0 1.3x10-3 -29.0 0.97 74.0
0.20 -14.0 106.0 8.0x10-4 -31.0 -0.97 72.0
0.10 -20.0 100.0 2.0x10-4 -37.0 -6.99 66.0
7.5x10-2 -22.5 97.5 1.1x10-4 -39.5 -9.49 63.5
5.0x10-2 -26.0 94.0 5.0x10-5 -43.0 -13.0 60.0
2.5x10-2 -32.0 88.0 1.3x10-5 -49.0 -19.0 54.0
2.0x10-2 -34.0 86.0 8.0x10-6 -51.0 -21.0 52.0
1.0x10-2 -40.0 80.0 2.0x10-6 -57.0 -27.0 46.0
7.5x10-3 -42.5 77.5 1.1x10-6 -59.5 -29.5 43.5
5.0x10-3 -46.0 74.0 5.0x10-7 -63.0 -33.0 40.0
2.5x10-3 -52.0 68.0 1.3x10-7 -69.0 -39.0 34.0
2.0x10-3 -54.0 66.0 8.0x10-8 -71.0 -41.0 32.0
1.0x10-3 -60.0 60.0 2.0x10-8 -77.0 -47.0 26.0
7.5x10-4 -62.5 57.5 1.1x10-8 -79.5 -49.5 23.5
5.0x10-4 -66.0 54.0 5.0x10-9 -83.0 -53.0 20.0
2.5x10-4 -72.0 48.0 1.3x10-9 -89.0 -59.0 14.0
2.0x10-4 -74.0 46.0 8.0x10-10 -91.0 -61.0 12.0
1.0x10-4 -80.0 40.0 2.0x10-10 -97.0 -67.0 6.0
7.5x10-5 -82.5 37.5 1.1x10-10 -99.5 -69.5 3.5
5.0x10-5 -86.0 34.0 5.0x10-11 -103.0 -73.0 0.0
2.5x10-5 -92.0 28.0 1.3x10-11 -109.0 -79.0 -6.0
2.0x10-5 -94.0 26.0 8.0x10-12 -111.0 -81.0 -8.0
1.0x10-5 -100.0 20.0 2.0x10-12 -117.0 -87.0 -14.0
7.5x10-6 -102.5 17.5 1.1x10-12 -119.5 -89.5 -16.5
5.0x10-6 -106.0 14.0 5.0x10-13 -123.0 -93.0 -20.0
2.5x10-6 -112.0 7.96 1.3x10-13 -129.0 -99.0 -26.0
2.0x10-6 -114.0 6.02 8.0x10-14 -131.0 -101.0 -28.0
1.0x10-6 -120.0 0.00 2.0x10-14 -137.0 -107.0 -34.0
 
Power V@ 1 m V@ 10 m V@ 100 m V@ 1 km V@ 10 km
1 W 5.5 V/m 0.55 V/m 0.05 V/m 5.5 mV/m 0.55 mV/m
10 W 17.4 V/m 1.7 V/m 0.17 V/m 17 mV/m 1.7 mV/m
100 W 55 V/m 5.5 V/m 0.55 V/m 55 mV/m 5.5 mV/m
1 kW 174 V/m 17.4 V/m 1.74 V/m 170 mV/m 17 mV/m
10 kW 550 V/m 55 V/m 5.5 V/m 550 mV/m 55 mV/m
100 kW 1740 V/m 174 V/m 17.4 V/m 1.74 mV/m 174 mV/m