Wide range programmable resistor for discrete logarithmic control, and tuning circuit for variable gain active filter using same
US10291207B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2016 |
| Grant date | May 14, 2019 |
| Priority date | — |
| Expiry date | Dec 11, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/028
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A programmable resistor can provide discrete logarithmic (linear-in-dB) gain control. It can include multiple like programmable resistor subnetworks or cells, such as can be connected in parallel, such as according to a decoding scheme. The subnetworks can be configured to cover a subrange such as [0 dB, −6 dB) relative to the maximum resistance value. Coarse increments of −6 dB can be further added to this range by successively doubling the number of subnetworks that are connected in parallel. An additional decoder help ensure a linear control curve, free of dead zones or other nonlinearities. The programmable resistor can be suitable for use in such circuits as programmable-gain amplifiers, filters, or more complex networks, such as where the resistance can be programmed as a function of a digital code. An example including a tuning circuit for a variable gain active filter is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.