Volume circuit using resistive ladder circuits
US7298855B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2002 |
| Grant date | Nov 20, 2007 |
| Priority date | — |
| Expiry date | Nov 28, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45591
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A volume circuit contains resistive ladder circuits, from which a desired fractional voltage output (Vs) is extracted and supplied to an amplifier to provide an output voltage (Vout). The resistive ladder circuits comprise multiple lines of series resistances, wherein each line contains a resistance portion ‘nR’ (where ‘n’ denotes a division index, and ‘R’ denotes an element resistance) that is connected in parallel with a next line, so that an overall resistance of following lines is ‘(n−1)×n’ times larger than the element resistance. Secondary resistive ladder circuits can be additionally arranged in series in order to control a secondary amplifier that absorbs excessive currents flowing into the resistive ladder circuits. The secondary resistive ladder circuits are constituted symmetrically with the resistive ladder circuits, in which output terminals (t1-t12) are all set to the same potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.