A Current Generating Circuit Applied in Low-Voltage Phase Interpolator

Abstract

The invention provides a current generating technique, and more specifically, provides a current generating circuit applied in a low-voltage phase interpolator. The current generating circuit is characterized by including a phase quantization DAC circuit and a current converter, voltages outputted by the phase quantization DAC circuit are used for controlling the current converter, and currents generated by the current converter are used for controlling a subsequent phase mixer. The provided current generating circuit applied in the low-voltage phase interpolator can greatly improve the linearity of the phase interpolator and has an important application value.

Description

technical field [0001] The invention relates to an electric current generation technology. More particularly, the present invention relates to current generating circuits for use in low voltage phase interpolators. Background technique [0002] With the continuous development of information technology, applications such as high-density computing, network communication, intensive image processing, and mass data transmission have higher and higher requirements for data transmission rates. In order to improve the communication rate between chips, a variety of high-speed Transmission protocol, the data bandwidth is as high as several Gbps or even tens of Gbps. Most of these high-speed protocols use serial communication, and the clock is implicit in the data, and there is no longer a separate clock line. Therefore, a clock data recovery circuit is required at the receiving end to correctly extract the data. There are many implementation methods for clock data recovery, such as ...

AI Technical Summary

Problems solved by technology

The phase mixer in the phase interpolation circuit uses a differential pair tube and a tail current source tube is connected below it. Due to the reduction of the power supply voltage, the common mode level of the differential pair tube of the phase interpolator decreases, and the overdrive voltage of the tail current source tube It will be designed smaller and smaller, and its drain terminal voltage is smaller than the gate terminal voltage, and with the influence of the channel modulation effect, the power mirroring accuracy is getting worse and worse. Under different process, voltage and temperature combinations, the current The adaptation can be up to 30%, which seriously affects the performance of the phase interpolator

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