DC-coupled multi-stage amplifier using all-pass resistive/capacitive network for level shifting
US6943631B2 · kind B2 · utility
35Cited by
3References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2003 |
| Grant date | Sep 13, 2005 |
| Priority date | — |
| Expiry date | Mar 3, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/288
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A resistive level-shifting biasing network is used with a capacitor in parallel to couple FET-based amplifier stages from DC to several GHz in a multi-stage amplifier. The output of the first amplifier stage is connected to the input of the second amplifier stage without a blocking capacitor or level-shifting diodes, allowing a portion of the drain current for the first amplifier stage to be supplied from the second amplifier stage. In a particular embodiment, a distributed amplifier achieved over 20 dB gain from DC to about 80 GHz using three traveling wave amplifier chips.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.