Single amplifier presale processing circuitry
US7466746B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 2005 |
| Grant date | Dec 16, 2008 |
| Priority date | — |
| Expiry date | Jun 2, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An device and method for a pre-sampling processing is disclosed. The pre-sampling device includes a single amplifier having a virtual ground node, and a feed back circuit connected from an output of the amplifier to the virtual ground node. The feed back circuit includes a plurality of switches connected to the virtual ground node. The switches control a plurality of programmable gain settings. The feed back circuit also includes an adjustable current source that is adjusted according to an estimated echo signal. A current of the adjustable current source is summed at the virtual ground node. The feed back circuit also includes a low pass filter that is tuned to suppress received signal frequencies above a fraction of a sampling frequency of a sampler connected to the pre-sampling device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.