Phase interpolator circuit and method for improving linearity thereof
A phase interpolator and circuit technology, applied in the direction of electrical components, pulse processing, pulse technology, etc., can solve problems that affect the normal operation of the post-stage circuit of the phase interpolator circuit
Active Publication Date: 2018-07-06
SANECHIPS TECH CO LTD
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Problems solved by technology
The integral nonlinearity (INL, Integral Nonlinearity) and differential nonlinearity (DNL, Differential Nonlinearity) of the phase of the output clock of the ordinary phase interpolator circuit are often greater than 1 least significant bit (LSB, Least Significant Bit), which affects the phase interpolator circuit. Normal operation of the post-stage circuit
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[0039] In order to understand the characteristics and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present invention.
[0040] The ordinary phase interpolator circuit is affected by the nonlinearity of the current source, the phase of the output clock changes nonlinearly, and the INL and DNL of the phase are often greater than 1LSB. In addition, due to the influence of large parasitic capacitance, when the phase of the output signal changes, the change of the current cannot respond in time, making it difficult to change the phase smoothly. These all degrade the performance of the phase interpolator. Therefore, an embodiment of the present invention proposes a phase interpolator circuit and...
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The invention discloses a phase interpolator circuit and a method for improving the linearity thereof. The phase interpolator circuit comprises N phase interpolator units, wherein N is greater than orequal to 2; the phase interpolator unit comprises a differential switching tube circuit, a current control circuit and a bias current circuit, the differential switching tube circuit comprises a first switching tube and a second switching tube; the first switching tube is connected to a clock signal input end, a negative signal output end and the current control circuit; the second switching tubeis connected to a clock signal input end, a positive signal output end and the current control circuit; the current control circuit is connected with the control signal input end, the differential switching tube circuit and the bias current circuit; and the bias current circuit is connected with a reference signal input end, the current control circuit and the ground.
Description
technical field [0001] The invention relates to a phase interpolator circuit, in particular to a phase interpolator circuit and a method for improving linearity thereof. Background technique [0002] Phase interpolator (PI, Phase Interpolator) circuits are widely used in high-speed digital-analog hybrid circuits (such as phase-locked loop (PLL, Phase Locked Loop) circuits, clock data recovery (CDR, Clock Data Recovery) circuits, etc.). As the operating speed continues to increase, the accuracy requirements for the phase interpolator circuit are also increasing. The integral nonlinearity (INL, Integral Nonlinearity) and differential nonlinearity (DNL, Differential Nonlinearity) of the phase of the output clock of the ordinary phase interpolator circuit are often greater than 1 least significant bit (LSB, Least Significant Bit), which affects the phase interpolator circuit. The normal operation of the subsequent circuit. How to reduce the INL and DNL of the output phase of t...
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IPC IPC(8): H03K5/135
CPCH03K5/135
Inventor 易生涛
Owner SANECHIPS TECH CO LTD