Title:
FRONT END AMPLIFIER CIRCUIT AND OPTICAL RECEIVER USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2004/068702
Kind Code:
A1
Abstract:
A front end amplifier circuit includes a front end amplifier for changing a feedback resistance according to a control signal and setting a band width to be amplified, control signal generation means for detecting a band of an output signal of the front end amplifier and generating the control signal, and correction signal generation means for generating a correction signal of the control signal. The control signal is corrected by the correction signal and the feedback resistance value is changed/adjusted. Even when the number of rises and falls of an optical input signal within a predetermined time has become smaller than a predetermined range, it is possible to correctly generate a control voltage to perform normal band control. That is, it is possible to realize an optical receiver in which the band width is automatically adjusted without being affected by the input signal pattern and to reduce the cost.
Inventors:
KUNII MASAKI (JP)
OSADA HIROKAZU (JP)
OSADA HIROKAZU (JP)
Application Number:
PCT/JP2003/000734
Publication Date:
August 12, 2004
Filing Date:
January 27, 2003
Export Citation:
Assignee:
FUJITSU LTD (JP)
KUNII MASAKI (JP)
OSADA HIROKAZU (JP)
KUNII MASAKI (JP)
OSADA HIROKAZU (JP)
International Classes:
H03F1/42; H03F3/08; H03G3/20; H03G3/30; H04L27/36; (IPC1-7): H03F3/08
Foreign References:
| JP2002135214A | 2002-05-10 | |||
| JP2001211035A | 2001-08-03 | |||
| JPH01227508A | 1989-09-11 | |||
| JPH01253305A | 1989-10-09 |
Attorney, Agent or Firm:
Itoh, Tadahiko (Yebisu Garden Place Tower 20-3, Ebisu 4-chom, Shibuya-ku Tokyo, JP)
Download PDF:
Previous Patent: HIGH LINEARITY LOW NOISE AMPLIFIER
Next Patent: DEVICE AND METHOD FOR DIGITAL PULSEWIDTH MODULATION
Next Patent: DEVICE AND METHOD FOR DIGITAL PULSEWIDTH MODULATION