AD8319  R2=R3=3k9 X=2 F_in=10MHz Vpos=5v

PIC16F876 VCC=3,5v
Pin(dBm) ADChex ADCdec
+2	0ED	237
+1	0F4	244
0	0FC	252
-1	104	260
-2	10D	269
-3	117	279
-4	122	290
-5	12E	302
-6	13B	315
-7	149	329
-8	155	341
-12	18A	391
-22	212	530
-32	297	663
-42	318	792
-48	361	865

Slope dB/Count : -42 - -22 / 792 - 530 = -20 / 262 = -0,0763  Count/dB: 13,1
Slope dB/Count : -32 - -12 / 663 - 391 = -20 / 272 = -0,0735  Count/dB: 13,6
Slope dB/Count : -42 - -12 / 792 - 391 = -30 / 401 = -0,0748  Count/dB: 13,37


PdBm = -0,0748 * Count + 15

     =
 
-----------------------------------------------------------------------------
AD8319  R2=R3=3k9 X=2 F_in=10MHz Vpos=5v

pic16F876 5v vcc
Pin(dBm) ADChex	ADCdec	Vout
-inf	0285	645	3,22
+2	00A2	162	0,815
+1	00A6	166	0,837
0	00AB	171	0,861
-1	00B1	177	0,889
-2	00B7	183	0,922
-3	00BE	190	0,956
-4	00C6	198	0,993
-5	00CE	206	1,035
-6	00D7	215	1,079
-7	00E0	224	1,125
-8	00E8	232	1,116
-12	010E	270	1,357
-13	0118	280	1,404
-14	0121	289	1,452
-15	012B	299	1,499
-16	0134	308	1,547
-17	013D	317	1,592
-18	0146	326	1,637
-19	014F	335	1,684
-20	0159	345	1,731
-21	0162	354	1,778
-22	016B	363	1,821


Slope (dB/Count): -22 - -12 / 363 - 270 = -10 / 93 = -0,1075 dB/count
Slope b (Count/dB): -22 - -12 :  9,3 count/dB
Slope (mV/dB): 46,4mV/dB


Y = bX + C   met: Y=270 x=-12  en Y=363 en x=-22
270 = -12b + C    C = 12b+270
363 = -22b + C    C = 22b+363   22b+363 = 12b+270   10b= -93  b=-9,3  
daarmee C=12b+270   C=12*-9,3+270  C=158,4

bX = Y - C
x = ( Y-C ) / b

met: 
Y=270  C=158,4 1/b=-0,1075  x = ( 270-158,4) / -9,3 = 111,6 * -0,1075 = -12
Y=275                       x = ( 275-158,4) * -0,1075 = -12,53

========================================================================


AD8319 R2=3k9 R3=2k2 Vpos=5,1V  PIC16F876 Vcc=5,1V   Itot=50mA

Pin_dBm	ADChex 	ADCdec 	Vout
0	00E7	231	1,160
-1	00EF	239	1,199
-2	00F7	247	1,242
-3	0100	256	1,287
-4	010A	266	1,338
-5	0116	278	1,394
-6	0121	289	1,453
-7	012E	302	1,515
-8	0139	313	1,570
-14	0186	390	1,94		-14 -54dB = 453 count  SLOPE=11,325COUNT/dB  56,75mV/dB
-24	0203	515	2,57
-25	020F	527	2,62
-28	0233	563	2,80		-8 -28dB = 250 COUNT  SLOPE= 0,08Db/COUNT  12,5COUNT/dB
-44	02F4	756	3,77
-45	02FF	767	3,82		-5 -45dB = 490 COUNT  SLOPE = 0,0816DB/COUNT =  12,25CNT/dB
-48	031D	797	3,97		-28 -48dB = 234 COUNT  SLOPE = 
-54	034B	843	4,21
-inf	0365	869	4,34

Y = bX + C  met: Y=278 X=-5 en Y=767 X=-45
278=-5b + C    C=5b+278 
767=-45b + C   C=45b+767  =>  45b+767=5b+278   40b=278-767  b=12,225

C=5b+278 = 5*12,225+278 = 339,125


P = bx + C met P=-5 X=278  en P=-45 X=767
-5 = 278b + C    C= -278b -5
-45 = 767b + C   C= -767b -45  => -767b-45=-278b-5  489b = -40   b=-0,0818

C=-278*-0,0818 - 5 = 17,74
C=-767*-0,0818 -45 = 17,74



P = count * -0,0818 + 17,74  (dBm)
















Intercept = 15  (waarde van X voor Y=0)
Slope (b) = -0,02  Volt/dB
Slope 1/b = -50 dB/Volt

Y = bX + C
b = -0,02  
C = 0,3


Y = -0,02X + 0,3

Y - 0,3 = -0,02X
50 ( Y - 0,3 ) = -X
X = -50 ( Y - 0,3)

X = -50Y + 15
 

voor Y = 1
  X = -50 + 15 = -35

voor Y = 0,5
 X = -25 + 15 = -10