Techniques for measuring slew rate in current integrating phase interpolator
US11165431B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 2020 |
| Grant date | Nov 2, 2021 |
| Priority date | — |
| Expiry date | Dec 9, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/033
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An apparatus is described and includes a current integrating phase interpolator core having a programmable bias current; an AC-coupled inverter circuit coupled to an output of the current integrating phase interpolator core for receiving a signal comprising a periodic sawtooth waveform therefrom; a digital-to-analog (D/A) converter for setting an input common mode voltage of the AC-coupled inverter circuit; a duty cycle measurement (DCM) circuit for measuring a duty cycle distortion (DCD) of a rectangular wave clock signal output from the AC-coupled inverter circuit; and a circuit for computing a difference in the DCD of the rectangular wave clock signal when the input common mode voltage of the AC-coupled inverter circuit is set to a high voltage and when the input common mode voltage of the AC-coupled inverter circuit is set to a low voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.