Class AB amplifier for use in semiconductor memory devices
US6259280A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1998 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Sep 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45273
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A class AB amplifier (400) is disclosed, having a first input node (402), a second input node (404), and an output node (406). A push-pull input stage (412) includes cross-coupled pairs of transistors, which form a charge current path and a discharge current path. When the voltage at the first input node (402) is greater than the voltage at the second input node (406), the amount of current drawn in the charge current path increases, and the amount of current drawn in the discharge current path decreases. When the voltage at the first input node (402) is less than the voltage at the second input node (404), the amount of current in the charge current path decreases while the amount of current in the discharge path increases. A first and fourth current mirror (422 and 428) are coupled to the charge current path, and a second and third current mirror (424 and 426) are coupled to the discharge current path. In response to increases in the amount of current drawn in the charge current path, the first current mirror (422) drives a discharge node (432) to a charge voltage, and the fourth current mirror (428) drives a charge node (434) to a charge voltage. In response to increases in the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.