Bipolar emitter couple pair transconductor for high speed operational amplifiers
US6710655B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Jun 5, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45466
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An emitter coupled pair transconductor circuit includes: an emitter couple pair 20 and 21; and a tail current source coupled to the emitter couple pair wherein the tail current source provides a tail current that is a hyperbolic cosine function relative to a differential input signal. This solution transforms the output current of an emitter couple pair transconductor from a hyperbolic tangent to a hyperbolic sine by using a hyperbolic cosine comparator for the biasing. By doing this, the transconductor has a similar speed behavior to a second-generation current conveyor and is more precise. This transformation makes a regular transconductor very fast without changing its parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.