Datenblatt-Suchmaschine für elektronische Bauteile |
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TS613 Datenblatt(PDF) 6 Page - STMicroelectronics |
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TS613 Datenblatt(HTML) 6 Page - STMicroelectronics |
6 / 9 page 6/9 TA0313 STMicroelectronics Solutions for ADSL Line Interfaces Increasing the line level by using an active impedance matching With passive matching, the output signal amplitude of the driver must be twice the amplitude on the load. To go beyond this limitation an active matching impedance can be used. With this technique it is possible to maintain good impedance matching with an amplitude on the load higher than half of the output driver amplitude. This concept is shown in Figure 7 for a differential line. Component calculation Let us consider the equivalent circuit for a single-ended configuration, as shown in Figure 8. For unloaded system, we can assume that currents through R1, R2 and R3 are respectively: Figure 7: TS613 as a differential line driver with an active impedance matching Figure 8: Single ended equivalent circuit ½R1 R4 R2 _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 100 Ω 1:2 Hybrid & Transformer GND +12V 3k9 3k9 10µ 100n 100n 100n 1k 1k Rs1 10n 1µ _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 Ω 1:2 Hybrid & Transformer GND +12V 3k9 3k9 10µ 100n 100n 100n 1k 1k 10n 1µ Rs2 R5 R3 ½R1 Vo° Vo° ½R1 R4 R2 _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 100 Ω 1:2 Hybrid & Transformer GND +12V 3k9 3k9 10µ 100n 100n 100n 1k 1k Rs1 10n 1µ _ + _ + Vi Vi Vo Vo 3 2 6 5 1 7 4 GND 8 +12V 25 Ω 1:2 Hybrid & Transformer GND +12V 3k9 3k9 10µ 100n 100n 100n 1k 1k 10n 1µ Rs2 R5 R3 ½R1 Vo° Vo° 1/2 R1 R2 R3 + _ Vi Vo Rs1 -1 Vo° 1/2 RL 2Vi R1 --------- Vi Vo ° – () R 2 --------------------------- and Vi Vo + () R 3 ------------------------ , |
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Ähnliche Beschreibung - TS613 |
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