DC-coupled differential circuit front end
US9306609B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 13, 2015 |
| Grant date | Apr 5, 2016 |
| Priority date | — |
| Expiry date | Jan 13, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/548
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A front-end of a first differential circuit is DC-coupled to a second differential circuit. The front-end comprises a resistive element, a voltage sensor and a current adjustor. The resistive element has a resistivity between a first end that is DC-coupled to the second circuit and a second end that is DC-coupled to the first circuit and accepts a programmable current passing therethrough to impose a voltage across the element that varies in direction and amplitude according to the current value. The voltage sensor senses a difference between a DC voltage at the second end of the resistive element and a desired reference voltage of the first circuit. The current adjustor adjusts a direction and amplitude of the programmable current so that the voltage of the first circuit matches the desired reference voltage of the first circuit. The first circuit may be a receiver circuit and the second circuit may be a transmitter circuit. The front-end may further comprise a current canceller comprising a second resistive element connected at a first end to the output of the second circuit. The current canceller senses the programmable current and generates a current of equal amplitude through …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.