Gain stage circuit with automatic level control
US5432389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1993 |
| Grant date | Jul 11, 1995 |
| Priority date | — |
| Expiry date | Jan 4, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G7/005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A gain stage circuit having automatic level control is provided. In particular, the gain stage circuit provides an output voltage signal that is a predetermined multiple of the input voltage signal when the input voltage is less than a predetermined threshold. Moreover, the gain stage circuit provides an output voltage that is maintained at a constant predetermined level and independent of the input voltage signal for input voltages that are above a predetermined threshold. The gain stage circuit includes a rectification circuit, a variable gain stage circuit, a current switch and an operational amplifier. The current switch circuit of the present invention provides either an output current of the rectification circuit or a constant current to a reference input of the variable gain stage circuit. Moreover, the variable gain circuit includes a gain input that is coupled to receive a constant reference current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.