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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 503

Fiber optic communication systems benefit from tiny, low noise avalanche photodiode bias supply

Michael Negrete

Abstract

The LT1930A 2.2MHz step-up DC/DC converter, which exceeds all of the stringent demands of an APD reverse-bias voltage and eliminates the need for custom APD bias supplies, is described.

Keywords

Avalanche photodiode

APD

LT1930A

Avalanche photodiodes (APDs) are the photo detectors of choice for long-haul fiber optic communication systems because of their high sensitivity and high internal gain. An important characteristic of APDs is that their internal gain is optimal when there is a high voltage reverse bias (30V to 90V) across the APD. Nevertheless, the high gain is all for naught if the sensitivity of ...

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