Four-stage circuit architecture for detecting pulsed signals
US9130070B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2013 |
| Grant date | Sep 8, 2015 |
| Priority date | — |
| Expiry date | Feb 14, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2210/003
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An electrical circuit includes a photodiode that receives a light signal from a light source and generates a photocurrent signal, a trans-impedance amplifier that amplifies the photocurrent signal and generates a low noise signal, and a high pass filter that converts the low noise signal into an alternating current (AC) signal having a positive amplitude, a negative amplitude, and a zero cross-over point between the positive amplitude and the negative amplitude. The electrical circuit also includes a positive integrating amplifier that receives the positive amplitude of the AC signal and generates a positive integrated value over an integration period, and a negative integrating amplifier that receives the negative amplitude of the AC signal and generates a negative integrated value over the integration period. The electrical circuit further includes at least one analog-to-digital converter that receives the positive and negative integrated values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.