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AssigneeElectronics and Telecommunications Research Institute
InventorsSang-Heung Lee, Seong-il Kim, Dong Min Kang, Jong-Won Lim, Chull Won Ju, Hyung Sup Yoon, Jae Kyoung Mun, Eun Soo Nam
Estimating the term…
Provided is a feedback amplifier. The feedback amplifier includes: an amplification circuit unit amplifying a burst packet signal inputted from an input terminal and outputting the amplified voltage to an output terminal; a feedback circuit unit disposed between the input terminal and the output terminal and controlling whether to apply a fixed resistance value to a signal outputted to the output terminal; a packet signal detection unit detecting a peak value of a burst packet signal from the output terminal and controlling whether to apply the fixed resistance value; and a bias circuit unit generating a bias voltage, wherein the feedback circuit unit determines a feedback resistance value to change the fixed resistance value in response to at least one control signal and adjusts a gain by receiving the bias voltage.
A feedback amplifier comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
With semiconductor devices only: controlled by light
Using continuously variable impedance elements: using photo-electric elements
Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal: using discontinuously variable…
Gain control in amplifiers or frequency changers: manually-operated control
About 7 years of term left · ends 30 Oct 2033 (estimated)
This U.S. non-provisional patent application claims priority under 35 U.S.C. §119 of Korean Patent Application No. 10-2013-0000317, filed on Jan. 2, 2013, the entire contents of which are hereby incorporated by reference.
The present invention disclosed herein relates to an optical communication system, and more particularly, to a feedback amplifier for receiving an input signal regardless of the size of the input signal.
An optical access network evolves into the form of an optical multiple access using a passive optical network (PON). Such a passive optical network system uses an optical signal in a burst mode. An optical signal in the burst mode changes drastically and abruptly when a packet in one channel switches into a packet in another channel. Accordingly, an optical receiver requires a high reception sensitivity in addition to a wide dynamic range. A preamplifier is disposed at the first state where a signal is inputted in the optical receiver and the performance of the preamplifier is determined depending on the performance of a feedback amplifier.
The accompanying drawings are included to provide a further understanding of the present invention, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present invention and, together with the description, serve to explain principles of the present invention. In the drawings:
FIG. 1 is a schematic view of a typical feedback amplifier;
FIG. 2 is a view of a feedback amplifier according to an embodiment of the present invention;
Preferred embodiments of the present invention will be described below in more detail with reference to the accompanying drawings. The present invention may, however, be embodied in different forms and should not be constructed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.
The present invention provides a feedback amplifier, as an optical communication system, adjusting a gain regardless of the size of an input signal in a passive optical network (PON) system. For example, a feedback amplifier may be disposed in an optical receiver.
FIG. 1 is a schematic view of a typical feedback amplifier.