Zakładka z wyszukiwarką danych komponentów |
|
AD8350 Arkusz danych(PDF) 11 Page - Analog Devices |
|
AD8350 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 14 page REV. AD8350 –11– RFEXT – 20 0 18 16 14 12 10 8 6 4 2 0 500 1000 1500 2000 AD8350-20 AD8350-15 Figure 11. Power Gain vs. External Feedback Resistors for the AD8350-15 and AD8350-20 with RS = 100 Ω and RL = 100 Ω The power gain of any two-port network is dependent on the source and load impedance. The effective gain will change if the differential source and load impedance is not 200 Ω. The single- ended input and output resistance of the AD8350 can be modeled using the following equations: R RR RR R gR IN FL FL INT mL = + + ++ × 1 (4) and R R RR g RR RR gR for R k OUT F S INT m S INT FS mS S = + + +× + ≈ + +× ≤ 1 11 1 1 11 1 1 Ω (5) where RF =RFEXT//RFINT RFEXT = R Feedback External RFINT = 662 Ω for the AD8350-15 = 1100 Ω for the AD8350-20 RINT = 25000 Ω gm = 0.066 mhos for the AD8350-15 = 0.110 mhos for the AD8350-20 RS = R Source (Single-Ended) RL = R Load (Single-Ended) RIN = R Input (Single-Ended) ROUT = R Output (Single-Ended) The resultant single-ended gain can be calculated using the following equation: G Rg R RR R R R g V Lm F LS F L S m = ×× − () ++ + × × 1 (6) Driving Lighter Loads It is not necessary to load the output of the AD8350 with a 200 Ω differential load. Often it is desirable to try to achieve a complex conjugate match between the source and load in order to minimize reflections and conserve power. But if the AD8350 is driving a voltage responding device, such as an ADC, it is no longer necessary to maximize power transfer. The harmonic distortion performance will actually improve when driving loads greater than 200 Ω. The lighter load requires less cur- rent driving capability on the output stages of the AD8350 resulting in improved linearity. Figure 12 shows the improve- ment in second and third harmonic distortion for increasing differential load resistance. RLOAD – –66 200 –68 –70 –72 –74 –76 –78 –80 –82 300 400 500 600 700 800 900 1000 HD3 HD2 Figure 12. Second and Third Harmonic Distortion vs. Differential Load Resistance for the AD8350-15 with VS = 5 V, f = 70 MHz, and VOUT = 1 V p-p B |
Podobny numer części - AD8350_15 |
|
Podobny opis - AD8350_15 |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |