High resolution interpolator for optical encoder
US9887781B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 2016 |
| Grant date | Feb 6, 2018 |
| Priority date | — |
| Expiry date | Oct 24, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/616
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device includes an optical modulator configured to produce first and second modulated optical signals in response to a first electrical signal and a reference optical signal. The device further includes a phase detector configured to receive first and second encoded optical signals and the first and second modulated optical signals and to produce a second electrical signal indicating a phase difference between the first encoded optical signals and the first modulated optical signals. The device further includes a voltage-controlled oscillator configured to produce electrical pulses in response to the second electrical signal, and a counter configured to count a number of the electrical pulses, producing a count. The first electrical signal to the optical modulator is the count or a derivative of the count.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.