Phase interpolator

Abstract

The invention relates to the technical field of high-speed data transmission, in particular to a phase interpolator which comprises a phase adjusting circuit, a phase adjusting circuit and a control circuit, the phase adjusting circuit comprises a first phase adjusting module and a second phase adjusting module, the first phase adjusting module outputs a first clock signal, and the second phase adjusting module outputs a second clock signal; the first phase adjustment module and the second phase adjustment module are connected in parallel to output an interpolation signal. The technical schemeprovided by the invention has the beneficial effects that through a first phase adjustment module and a second phase adjustment module a first clock signal and a second clock signal with the same frequency and different phases are mixed in proportion by adopting a voltage mode to generate an interpolation signal with the same frequency and the phase between the first clock signal and the second clock signal so as to achieve the purpose of phase adjustment, and meanwhile, the circuit can be carried out under lower voltage, so that the power consumption of the phase adjustment circuit is further reduced.

Description

technical field [0001] The invention relates to the technical field of high-speed data transmission, in particular to a phase interpolator. Background technique [0002] Phase interpolator has been widely used as a device to adjust the phase of circuit clock. A phase interpolator is a device that can mix two periodic input clock signals with the same frequency and different phases in proportion to generate an output clock signal with the same frequency but a phase between the two. In practical applications, it has The need to switch gears. [0003] In the existing technology, such as figure 1 As shown, the traditional phase interpolator is a current steering type. By selecting the different current weights of two adjacent IQ clock signals in the circuit, a clock located in the middle phase of the two IQ clocks is obtained; as figure 2 As shown, it represents the phase diagram of the traditional phase interpolator. a1 and a2 refer to the weights of the two input phases re...

AI Technical Summary

Problems solved by technology

When the above circuits are applied in high-speed circuits, since they are all driven by current, in order to ensure the fast switching of the signal at high speed, a large current is required. At the same time, there are certain requirements for the input signal. The input signal needs to be as similar to a sinusoidal signal as possible. Get better results and cost more

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