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Phase detector based on CML (Current Mode Logic)

A phase detector and logic technology, applied in the direction of automatic power control, electrical components, etc., can solve problems such as multi-static power loss, achieve the effects of reducing power consumption, saving power consumption, and improving anti-interference ability

Active Publication Date: 2012-12-26
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CML logic style has more static power loss than CMOS inverter

Method used

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  • Phase detector based on CML (Current Mode Logic)
  • Phase detector based on CML (Current Mode Logic)
  • Phase detector based on CML (Current Mode Logic)

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Embodiment Construction

[0022] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the phase detector based on CML logic of the present invention, a regenerative CML phase latch is introduced: the existing common CML latch is replaced by a regenerative CML latch, that is, the follower branch and the lock for the circuit The storage branches respectively provide two independent tail current sources, so that the two parts can be optimized separately, thereby reducing unnecessary circuit power consumption.

[0024] The phase detector framework of the present invention is based on a half-rate phase detector structure proposed by B. Razavi, that is, the sampling clock frequency is half of the operating frequency. The overall circuit includes a samp...

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Abstract

The invention relates to the technical field of an integrated circuit and discloses a phase detector based on CML (Current Mode Logic). The phase detector comprises a sampling module and a comparison module which are connected with each other, wherein the sampling module comprises multiple sampling branches which are formed by CML latches and used for sampling the input data signals, and the comparison module is used for comparing the sampling data of the multiple sampling branches to obtain a phase comparison result. Firstly, the adopted latches are all based on CML, differential signals are processed, the anti-interference capability under high frequency is improved; and secondly, the tail current sources of the latches are divided, and the power consumption of a circuit in the latch state can be saved effectively, so that the power consumption of a whole phase detecting circuit is reduced effectively. Based on the two points, the phase detector has the advantages that the power consumption is lowered on the premise of ensuring that the phase error meets the system vibrating requirement.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a phase detector based on CML logic. Background technique [0002] Phase detectors are widely used in phase-locked circuits and clock recovery modules, and their phase detection accuracy directly determines the jitter performance of the circuit. CML (Current Mode Logic) logic is characterized by low signal swings compared to static CMOS circuits. With the continuous improvement of data transmission rate, when the serial data transmission rate reaches 10Gbps~40Gbps, the high-speed performance of CML logic circuit becomes more and more significant, making it gradually replace CMOS logic and is widely used in serial high-speed data transmission. [0003] Literature [1] first proposed MOS current-mode logic style implementation of gigahertz MOS adaptive pipeline technology. It has been widely used since then to implement ultra-fast buffers, latches, multiplexers and dem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/085
Inventor 王源杨海玲张雪琳贾嵩杜刚张兴
Owner PEKING UNIV
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