Low headroom X-bridge transconductor
US7800445B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2008 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Oct 29, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45094
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A transconductance cell includes a positive rail for providing a positive power supply voltage and a negative rail for providing a negative power supply voltage. A pair of voltage inputs, one inverting and one non-inverting, develop a differential voltage input signal having a common mode voltage range from one of the rail voltages to within a volt or less of the other rail voltage. And a pair of cross-coupled transconductor circuits each have: (i.) a source voltage follower responsive to one of the voltage inputs for sourcing relatively unbounded output current at unity voltage gain, (ii.) a sink voltage follower responsive to the other voltage input for sinking unbounded output current to a current output terminal, and (iii) a transconductance resistor connected between the source voltage follower and the sink voltage follower for developing a differential output current proportional to the differential voltage input signal. Transconductance of the cell is substantially constant over the range of the differential voltage input signal without limiting the differential output current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.