Linear high-frequency amplifier with high input impedance and high power efficiency
US5844443A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1996 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Dec 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/307
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A high-frequency power amplifier circuit offers the advantages of high input impedance, good linearity, high power efficiency and accurate bias current control in a compact and economical circuit configuration. The amplifier includes a single-ended output stage driven by a symmetrical push-pull emitter follower stage with both active pull-down and active pull-up capability. The emitter follower stage is driven by an active phase-splitter stage, with bias current for the phase-splitter stage and subsequent stages being provided by a bias-current control stage which is directly connected to the phase splitter stage. A linear voltage-to-current converter stage receives a high-frequency input voltage and provides a high-frequency current signal to the input terminal of the bias-current control stage that controls the current in the output stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.