Low voltage class AB amplifier with gain boosting
US6127891A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1999 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Apr 5, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45574
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A low voltage amplifier with gain boosting and a reduced power supply voltage requirement. A cascode amplifier circuit, biased with the power supply voltage, amplifies a pair of related, differential input signals based upon a pair of gain boost control signals and in accordance therewith provides a pair of gain boosted signals which correspond to the input signals. A gain boost control circuit, also biased with the power supply voltage, uses the differential input signals to generate the gain boost control signals. A class AB amplifier circuit, also biased with the power supply voltage, amplifies the gain boosted signals and in accordance therewith provides a class AB output signal which corresponds to the original input signals. The cascode amplifier circuit, gain boost control circuit and class AB amplifier circuit together operate with a minimum power supply voltage which equals a sum of one active transistor input bias potential and two active transistor output bias potentials EQU (V.sub.DD(min) -V.sub.SS =V.sub.gs +V.sub.dsat +V.sub.ce).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.