Moteur de recherche de fiches techniques de composants électroniques |
|
TS616 Fiches technique(PDF) 25 Page - STMicroelectronics |
|
TS616 Fiches technique(HTML) 25 Page - STMicroelectronics |
25 / 27 page TS616 25/27 Component Calculation Let us consider the equivalent circuit for a sin- gle-ended configuration as shown in Figure 69. Figure 69: Single ended equivalent circuit Let us consider the unloaded system. Assuming the currents through R1, R2 and R3 are respectively: as Vo° equals Vo without load, the gain in this case becomes : The gain, for the loaded system will be (eq1): As shown in Figure70, this system is an ideal gen- erator with a synthesized impedance as the inter- nal impedance of the system. From this, the out- put voltage becomes: with Ro the synthesized impedance and Iout the output current. On the other hand Vo can be ex- pressed as: By identification of both equations (eq2) and (eq3), the synthesized impedance is, with Rs1=Rs2=Rs: Figure 70: Equivalent schematic. Ro is the synthesized impedance. Unlike the level Vo° required for a passive imped- ance, Vo° will be smaller than 2Vo in our case. Let us write Vo°=kVo with k the matching factor vary- ing between 1 and 2. Assuming that the current through R3 is negligible, (eq4) becomes the fol- lowing : After choosing the k factor, Rs will equal to 1/2RL(k-1). A good impedance matching assumes: (eq4) and (eq5) give : By fixing an arbitrary value of R2, (eq6) becomes : Finally, the values of R2 and R3 allow us to extract R1 from (eq1), and it becomes: R2 R3 + _ Vi Vo Rs1 -1 Vo° + _ -1 ½ RL ½ R1 R2 R3 + _ Vi Vo Rs1 -1 Vo° + _ -1 ½ RL ½ R1 2Vi R1 --------- Vi Vo ° – () R2 --------------------------- and Vi Vo + () R3 ------------------------ , G Vo noload () Vi --------------------------------- 1 2R2 R1 ----------- R2 R3 -------- ++ 1 R2 R3 -------- – ------------------------------------ == GL Vo with load () Vi -------------------------------------- 1 2 --- 1 2R2 R1 ----------- R2 R3 -------- ++ 1 R2 R3 -------- – ------------------------------------ eq1 () , == Vo ViG () RoIout () – = eq2 () , Vo Vi 1 2R2 R1 ----------- R2 R3 -------- ++ 1 R2 R3 -------- – ------------------------------------------------ Rs1Iout 1 R2 R3 -------- – ----------------------- eq3 () , – = Ro Rs 1 R2 R3 -------- – ----------------- eq4 () , = Ro Vi.Gi Iout 1/2 RL Ro kV oRL RL 2R s1 + ------------------------------ = Ro 1 2 --- RL eq5 () , = R2 R3 --------1 2Rs RL ----------- eq6 () , – = R3 R2 1 2Rs RL ----------- – --------------------- = |
Numéro de pièce similaire - TS616 |
|
Description similaire - TS616 |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |