Archive Eepn Com Cluster Common Eepn Images Articles 16871
Archive Eepn Com Cluster Common Eepn Images Articles 16871
Archive Eepn Com Cluster Common Eepn Images Articles 16871
Archive Eepn Com Cluster Common Eepn Images Articles 16871
Archive Eepn Com Cluster Common Eepn Images Articles 16871

Reverse Amp Eyes Cable Modems And Interactive Set-Top Boxes

June 1, 1999

For use in cable modems and interactive set-top boxes, ARA1400 reverse amplifier with step attenuator delivers up to 33 dB gain at 5V and provides low distortion and output noise while conforming to MCNS/DOCSIS standards of the cable industry. An integrated, digitally-controlled precision step attenuator is used to increase signal output power to the required levels. The attenuator varies gain in 4 dB steps over a range of 56 dB to provide better performance than variable gain amplifiers. ARA1400 reverse amp also provides maximum output noise power of -41 dBmV in a 3.2 MHz bandwidth at minimum gain setting and a noise figure of 1.7 dB. And it demonstrates maximum second harmonic levels of -55 dBc and maximum third harmonics of -60 dBc. The single-ended design achieves its harmonic performance without the need for a balun on the output stage, further reducing design costs.

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