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TAT8804D1H Datasheet(PDF) 7 Page - TriQuint Semiconductor |
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TAT8804D1H Datasheet(HTML) 7 Page - TriQuint Semiconductor |
7 / 12 page TAT8804D1H 21 dB CATV 12V Power Doubler TAT8804D1H-EBP Evaluation Board (With VSWR & Overdrive Protection) An RF overdrive situation exists if the tilt and pads commonly used before an output doubler are set to low levels during system turn up. Normally such overdrive is not a problem except when the output coax is not terminated. A full reflection at worst case phase may damage unprotected and overdriven amplifiers. An output protection scheme has been worked out for cases where customers cannot ensure that input RF overdrive and full reflections from the output coaxial network will not simultaneously occur. The scheme works by adding additional protection elements to the TAT8804 application circuit and in conjunction with the nominal 2.5 to 3.0 dB loss from output couplers, power inserters, and diplexer filters present in nearly all actives today. The circuit below protects the TAT8804 for an input +44 dBmV/ch FLAT (79 Ch. NTSC+ 75 Ch. QAM at -6 dB offset) condition and a full reflection of any phase after a 3 dB output loss. The inclusion of additional protection elements to this application circuit results in a small degradation in output performance. For more detailed discussion of this application, consult TriQuint Applications Engineering. C16 C3 C4 R1 L4 L3 T1 J1 J2 U1 L6 J3 L2 T2 C15 text 1109707AW REV A 1109707PC REV A C16 C3 C4 R1 L4 L3 T1 U1 L6 J3 L2 T2 C15 text AW REV A PC REV A Datasheet: Rev I 06-23-14 - 7 of 12 - Disclaimer: Subject to change without notice © 2014 TriQuint www.triquint.com |
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