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Patent Searching and Data


Title:
TRANSIMPEDANCE AMPLIFIER AND PON SYSTEM
Document Type and Number:
WIPO Patent Application WO/2010/082585
Kind Code:
A1
Abstract:
A technology for a gain-switching type transimpedance amplifier which prevents unnecessary gain switching that occurs when noise is received, and prevents reduction in sensitivity which occurs when a burst signal with a low input level is received after noise with a large input level is received. To provide this, the transimpedance amplifier (5) is provided with: a preamplifier (200) into which burst signals are inputted; an average detection start determination unit (300) which compares the output of the preamplifier (200) to a first threshold voltage; an average detection circuit (400) which detects and outputs the average of the output of the preamplifier (200) within a fixed period of time from the point of time when the output of the preamplifier (200) exceeds the first threshold voltage; and a gain-switching control unit (500) which determines whether to switch the gain of the preamplifier (200) based on the output of the average detection circuit (400).

Inventors:
MASHIMO DAISUKE (JP)
IKEDA HIROKI (JP)
MORITA YOSHINOBU (JP)
Application Number:
PCT/JP2010/050278
Publication Date:
July 22, 2010
Filing Date:
January 13, 2010
Export Citation:
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Assignee:
HITACHI LTD (JP)
MASHIMO DAISUKE (JP)
IKEDA HIROKI (JP)
MORITA YOSHINOBU (JP)
International Classes:
H03G3/30; H04B10/27; H04B10/272; H04B10/40; H04B10/43; H04B10/50; H04B10/60
Domestic Patent References:
WO2007036993A12007-04-05
Foreign References:
JP2003243955A2003-08-29
JP2008211702A2008-09-11
JP2000151290A2000-05-30
JP2000315923A2000-11-14
JP2006311033A2006-11-09
Other References:
See also references of EP 2388933A4
Attorney, Agent or Firm:
TSUTSUI, YAMATO (JP)
Tsutsui Daiwa (JP)
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