dB to PPM

\( x_{dB} = 20log({y_{ppm}\over1Million}) \)

			
				x = -90;
				while x >= -120
					y = f_dB_ppm(x);
					fprintf('%1.0fdB \t %1.2fppm\n', x, y);
					x = x-5;
				end;
			
			
				function [ y_ppm ] = f_dB_ppm(x_dB)
				  y_ppm = 10^(x_dB/20)*1e6;
				end
			
		
			
				>>
				-90dB 	 31.62ppm
				-95dB 	 17.78ppm
				-100dB 	 10.00ppm
				-105dB 	 5.62ppm
				-110dB 	 3.16ppm
				-115dB 	 1.78ppm
				-120dB 	 1.00ppm
			
		
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