Apparatus and method for a wide-band direct-coupled transistor amplifier
US4833423A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1987 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Jul 20, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/3066
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a wide-band direct-coupled transistor amplifier, the current through the power output stage must be stabilized to prevent fluctuations in the amplifier output signal. To stabilize the output stage current, a negative feedback loop is established providing a bias control for the amplifier input stage. In the past, voltage feedback apparatus, typically including operational amplifiers, has been utilized. In the present invention, a current feedback path, which avoids the voltage level translation inherent in the prior art, is used to provide the feedback bias control for the input stage of the amplifier. A technique for the compensation of temperature drift and for voltage offset is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.