High speed base drive for power amplifier
US4864247A · kind A · utility
Inventor
Key dates
| Filing date | Nov 14, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Nov 14, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/62
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A base drive circuit for a flyback output transistor has an inductive element having series connected coils for generating a linear ramping current to the base electrode of the output transistor in response to an input pulse. A high, almost instantaneous reverse current is produced through a discharge coil that receives inductively coupled energy from the current generating coils. The ratio of the maximum input current to the discharge current is established by the number of coils generating the input current versus the number of coils in the discharge circuit. Linearity of the base drive current is maintained by dissipating any excess energy in the inductive element to ground prior to each input pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.