Front end filter circuitry for a dual band GSM/DCS cellular phone
US6125271A · kind A · utility
109Cited by
8References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 6, 1998 |
| Grant date | Sep 26, 2000 |
| Priority date | — |
| Expiry date | Mar 6, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0017
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A front end circuit for an RF dual band GSM/DCS phone includes a first channel including an elliptical high-pass filter, a first SAW filter, and a low noise amplifier and a second channel including a second SAW filter and a second low noise amplifier. The output of each channel is alternately switchable to a single-side band mixer circuit. This front end circuit arrangement provides significantly reduced cost and part count over other approaches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.