Title:
PREAMPLIFIER CIRCUIT, CLOCK SWITCH CIRCUIT, AND OPTICAL RECEIVER USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2004/068705
Kind Code:
A1
Abstract:
The present invention comprises a preamplifier that establishes a bandwidth for performing amplification with a variable feedback resistor responsive to a control signal; control signal generating means that determines the band of the output signal of the preamplifier to generate the control signal; and correction signal generating means that generates a correction signal for correcting the control signal; wherein the correction signal corrects the control signal to adjust the value of the variable feedback resistor, whereby even when the number of rising and falling edges of light input signals in a given time period is lower than a predetermined value, the control voltage can be appropriately generated to perform a successful band control. Thus, an optical receiver that can automatically adjust the bandwidth with no influence of input signal pattern dependency can be obtained, and the cost can be reduced.
Inventors:
KUNII MASAKI (JP)
OSADA HIROKAZU (JP)
OSADA HIROKAZU (JP)
Application Number:
PCT/JP2004/000647
Publication Date:
August 12, 2004
Filing Date:
January 26, 2004
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): H03G3/20; H03F1/34; H03F3/08; H03G3/30; H04L25/03
Domestic Patent References:
| WO2001067597A1 | 2001-09-13 |
Foreign References:
| JPH03270504A | 1991-12-02 | |||
| JP2003023398A | 2003-01-24 |
Attorney, Agent or Firm:
Itoh, Takahiko (Yebisu Garden Place Tower 20-3, Ebisu 4-chome, Shibuya-k, Tokyo 32, JP)
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