Unlock instant, AI-driven research and patent intelligence for your innovation.

Active back-end termination circuit

a back-end termination and active technology, applied in the direction of pulse technique, semiconductor lasers, impedence matching networks, etc., can solve the problems of affecting the transmission performance, the inability to design a high-quality capacitor in the chip process, and the worsening of the signal reflection between the laser driver and the laser diod

Inactive Publication Date: 2010-12-16
NATIONAL TSING HUA UNIVERSITY
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]In summation of the description above, the active back-end termination circuit of the present invention has one or more of the following advantages:

Problems solved by technology

With the increasing operation speed of the optical communication network, the signal reflection between the laser driver and the laser diode is getting worse due to the impedance mismatch and it impacts the performance of the transmission.
In another prior art, the internal AC-coupled active back-end termination circuit disclosed in U.S. Pat. No. 6,667,661 is used, but it is very diffucult to design a high quality capacitor in chip process and it occupies large area.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Active back-end termination circuit
  • Active back-end termination circuit
  • Active back-end termination circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040]With reference to FIG. 1 for a schematic diagram of an active back-end termination circuit in accordance with the present invention, the active back-end termination circuit 1 comprises a first matching unit 11 and a second matching unit 12. The first matching unit 11 comprises a first resistor 111 and a first transistor 112. The first resistor 111 comprises a first terminal 1111 and a second terminal 1112. The first transistor 112 comprises a first source, a first gate and a first drain, and the first gate and the first drain are connected to the second terminal 1112, such that the first resistor 111 and the first transistor 112 are connected in series, and the first source is connected to a working voltage VTT.

[0041]The second matching unit 12 comprises a second resistor 121 and a second transistor 122. The second resistor 121 comprises a third terminal 1211 and a fourth terminal 1212. The second transistor 122 comprises a second source, a second gate and a second drain, and ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an active back-end termination circuit, which comprises a first resistor, a first transistor, a second resistor, and a second transistor. The first resistor and the first transistor are connected in series for forming a first impendence unit. A first source of the first transistor is connected to a working voltage with VTT. The second resistor and the second transistor are connected in series for forming a second impendence unit. A second gate and a second drain of the second transistor are connected to the working voltage with VTT. Wherein, the first impendence unit and the second impendence unit are connected in parallel. The first transistor or the second transistor is switched on through a power source, and the first transistor and the second transistor change the impedance actively for matching a load according to the voltage source.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an active back-end termination circuit, in particular to a DC-coupled active back-end termination circuit for matching the impedance of the load.[0003]2. Description of the Related Art[0004]At present, optical communication technology is the mainstream of the high-speed communication network. A direct modulation with distributed feedback (DFB) laser is generally adopted to a middle-distance of the optical communication technology, and an external modulation with DFB laser is adopted to a long-distance of the optical communication technology. As to the transmission rate, present manufacturers adopt a mature network technology in system carrier, namely a coarse wavelength division multiplexing (CWDM) technology having a primary technical specification of OC48(2.488 Gb / s)˜ OC192(9.953 Gb / s), and the research works will be headed to OC768(39.812 Gb / s) continually.[0005]The traditional laser ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H03H7/38
CPCH01S5/0427H03H11/28
Inventor KAO, MIN-SHENGHSU, YU-HAOWU, JEN-MING
Owner NATIONAL TSING HUA UNIVERSITY