Compact differential transconductance amplifier and a method of operation thereof
US6426676B1 · kind B1 · utility
Assignees
Inventor
Key dates
| Filing date | Jul 19, 2000 |
| Grant date | Jul 30, 2002 |
| Priority date | — |
| Expiry date | Jul 19, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45076
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
It is an object of the present invention to disclose a fully differential OTA. The active loads in the two output branches of the OTA show high conductance at low frequency and low conductance at higher frequency. In this way an OTA is constructed with inherent pass-band. Low frequencies are amplified little or even filtered out. The amplification of input referred offset voltage due to mismatches in transistor pairs is similarly reduced. Complementary, in another embodiment of the invention the OTA is of the low-pass type, i.e. also amplifying DC signals. Both OTA's are very compact and the common mode output voltage regulation is in both cases part of the active load structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.