High-speed electro-optical modulator drivers and method
US6836185B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 2002 |
| Grant date | Dec 28, 2004 |
| Priority date | — |
| Expiry date | May 25, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45691
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A modulator driver design is disclosed that employs a differential pair amplifier coupled to feedback amplifiers through tuning networks. Each tuning network comprises a set of inductors that enables a broadband response while reducing the loading effect of the feedback amplifier. An active load is placed at the output to serve multiple purposes, including: generating a high output swing, enabling a lower power supply voltage, and allowing the entire bias circuit to be monolithically integrated. A modulator driver comprises: a first amplifier stage (A1) having inputs and outputs; a second amplifier stage (A2), having inputs and outputs, the inputs of the second amplifier coupled to the outputs of the first amplifier; an active load having inputs and outputs, the inputs of the active load coupled to the outputs of the amplifier stage; and a feedback stage (A3) having inputs and outputs, the inputs of the feedback stage coupled to the outputs of the second amplifier stage by means of a tuning network, and the outputs of the feedback stage coupled to the inputs of the second amplifier stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.