Embedded variable gain amplifier in a current steering digital-to-analog converter
US10581450B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2019 |
| Grant date | Mar 3, 2020 |
| Priority date | — |
| Expiry date | Jan 16, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/742
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and associated methods relating to a digital-to-analog converter (DAC) include a programmable resistance network coupled between a voltage supply node VDD and a switch cell circuit to provide a predetermined resistance in response to the VDD and current IS of the switch cell circuit. In an illustrative example, the DAC may include a switch cell circuit comprising one or more switch cells connected in parallel. Each switch cell may include a differential gain circuit having a first branch coupled to a second branch at an input of a current source. The programmable resistance may include a variable resistance configured to adjust a voltage (Vbias) supplied to the switch cell circuit in response to a control signal. By introducing the programmable resistance network, predetermined bias and/or gain values may be dynamically adjusted with a constant board-level power supply VDD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.