Differential amplifier, comparator, and A/D converter
US6369743B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2000 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Dec 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/365
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An OTA circuit is disposed between a differential pair composed of NMOS transistors and an NMOS follower transistor that composes an output buffer circuit. The OTA circuit generates a compensation current that is equal to a current that flows in a capacitance formed between the gate and the drain of each of the differential pair transistors and that flows in the reverse direction thereof. The compensation current cancels the current that flows in the capacitance formed between the gate and the drain of each of the differential pair transistors. Thus, a differential amplifier that has a high accuracy and, high gain, and a wide frequency band and that operates at a low power voltage can be accomplished. Using a differential amplifier having a high gain and a wide frequency band, a comparator that operates at high speed and an A/D converter using such a comparator can be accomplished.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.