Offset-tolerant low noise amplifier
US8929012B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 2013 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | Oct 14, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The disclosure is directed to a low noise amplifier (LNA) configuration that compensates for DC offsets of incoming signals from a magnetoresistive head. According to various embodiments, the LNA includes a shunt-feedback differential pair of amplifiers adaptively biased according to a detected input DC voltage offset of the incoming signals from the magnetoresistive head. The LNA is thus enabled to amplify the AC signal component substantially unaffected by the DC offset. The DC component in the LNA output signal is then removable via offset compensating circuitry located between the LNA and subsequent stages without significant signal-to-noise ratio (SNR) penalty.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.