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An adaptive equalization and equalization filter technology, applied in baseband systems, shaping networks in transmitters/receivers, digital transmission systems, etc. Compensation effect is good, the adaptive adjustment range is increased, and the quality is improved
Active Publication Date: 2018-10-02
西安翔腾微电子科技有限公司
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Although the typical adaptive equalization structure can realize the adaptive equalization function, it has two disadvantages: one is that the power of low-frequency signals cannot be adjusted; the other is that the adaptive adjustment range is narrow
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example 1
[0025] Set the ratio of the number of differential pair tubes M7 tubes and M8 tubes,
[0026] M7 tube quantity: M8 tube quantity = 4:1
[0027] Set m=4 for the M7 tube and m=1 for the M8 tube.
[0028] Set the ratio of the number of differential pair tubes M11 and M12,
[0029] M11 tube quantity: M12 tube quantity = 4:1
[0030] Set m=4 for the M11 tube and m=1 for the M12 tube.
[0031] Set the current value of the current source 8 to 20mA, the current value of the current source 9 to 15mA, and the current value of the current source 10 to 0.5mA.
example 2
[0033] Set the ratio of the number of differential pair tubes M7 tubes and M8 tubes,
[0034] M7 tube quantity: M8 tube quantity = 6:1
[0035] Set m=6 for the M7 tube and m=1 for the M8 tube.
[0036] Set the ratio of the number of differential pair tubes M11 and M12,
[0037] M11 tube quantity: M12 tube quantity = 6:1
[0038] Set m=6 for the M11 tube and m=1 for the M12 tube.
[0039] Current value setting of current sources 8 and 9
[0040] Set the current value of the current source 8 to 20mA, the current value of the current source 9 to 15mA, and the current value of the current source 10 to 0.5mA.
[0041] From Example 1 and Example 2, it can be seen that by setting the ratio of the number of differential pair tubes, the internal self-built power threshold is realized, no external provision is required, and the number of circuit ports is not increased.
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Abstract
The invention provides a continuous-time adaptive equalizer which comprises an equalizing filter circuit, a limiting amplifier circuit, a high-pass filtering circuit, a rectifying circuit, an error amplifier circuit and a power detection circuit. The characteristics lie in that the continuous-time adaptive equalizer further comprises the power detection circuit PD, the output end an equalizing filter is connected with the power detection circuit PD, the output end of the power detection circuit PD is connected to a gain control end (gctrl end) of the equalizing filter, and the equalizing filter adjusts the amplification gain of a low-frequency part of an input signal of the equalizing filter according to a detection result of the power detection circuit PD for the low-frequency power. Thecontinuous-time adaptive equalizer can improve the quality of received signals, does not need a clock signal, is high in reliability, can be applied to the Ethernet, 1393 and other bus receivers and improves the accuracy of data reception.
Description
technical field [0001] The invention belongs to the electronic circuit design technology, and relates to a high-speed signal continuous time self-adaptive equalizer. The invention can be applied to high-speed bus receivers. Background technique [0002] In a wired communication system, due to non-ideal factors such as skin effect and dielectric loss, the channel exhibits low-pass characteristics. When the data rate far exceeds the channel bandwidth, it will cause inter-symbol interference (ISI), resulting in the current received bit. The pulse width and amplitude are reduced. The non-ideal characteristics of communication channels not only lead to intersymbol interference (ISI), but also severely limit the transmission rate and transmission distance. Therefore, in order to increase the transmission rate of the communication system or extend the transmission distance, the receiving end of the communication system must perform equalization compensation on the received signal...
Claims
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