Noise-shaped blocker-reject amplifier
US7619472B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2008 |
| Grant date | Nov 17, 2009 |
| Priority date | — |
| Expiry date | Jun 4, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/32
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A fully differential amplifier that amplifies and filters a signal band of a communications channel, the signal band including a desired signal and at least one blocker signal of an adjacent communications channel, the fully differential amplifier includes a fully differential operational amplifier (op-amp) with a common mode feedback, the fully differential operational amplifier amplifying the desired signal, a variable input resistance connected to an input of the fully differential op-amp, and an asymmetric floating frequency dependent negative resistance (AFFDNR) filter connected to the fully differential op-amp between the input and an output of the fully differential op-amp. A plurality of inputs of the fully differential op-amp may be virtually grounded to reduce swings in a voltage. The AFFDNR filter filters the at least one blocker signal and includes a plurality of resistors that implement a high order filtering of the at least one blocker signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.