Fourth-order electrical current source apparatus, systems and methods
US8436682B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2011 |
| Grant date | May 7, 2013 |
| Priority date | — |
| Expiry date | Nov 28, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45658
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods disclosed herein operate to receive a differential input signal at a first-stage pair of transconductance devices. The differential signal is amplified by a second-order factor at a positive-side or a negative-side first-stage transconductance device, depending upon the polarity of the differential input signal, to create a second-order signal at the output of the appropriate first-stage device. The second-order output signal is then amplified by another second-order factor at a corresponding second-stage transconductance device. A resulting fourth-order signal is made available at an output node as a quartic-response current source. The quartic-response current source may be utilized as a dynamic bias source in conjunction with a linear amplifier to provide a high slew rate amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.