Scheme for reducing transmit-band noise floor and adjacent channel power with power backoff
US6577189B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2001 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Sep 14, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/372
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A bandpass amplifier for use in a communication system is described. The amplifier includes first and second first-order filters, first and second multipliers, a quantizer, and a driver. In one embodiment, the first and second first-order filters are coupled in series. The first multiplier multiplies a signal from the first first-order filter by a coefficient k1, and the second multiplier multiplies a signal from the second first-order filter by a coefficient k2. The quantizer quantizes a summation of the signals from the first and second multipliers into one of two values, thereby generating a quantized signal. The driver amplifies the quantized signal, and generating an output signal. At least one of the coefficients k1 and k2 is adjusted based on a level of the output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.