Cascoded differential pair amplifier with current injection for gain enhancement
US5798660A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1996 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | Jun 13, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45192
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A cascoded differential amplifier with a circuit for the injection of current to enhance the gain is described. The differential amplifier includes a differential pair of n-MOS FET's connected to a current source an a positive and a negative input terminal. A pair of isolation n-MOS FET's are inserted between the differential pair and a pair of current source loads. These isolate the current source loads from the differential pair. A current injector is connected to the drains of the n-MOS FET's of the differential pair. The isolation n-MOS FET's and the injected currents enhance the gain of the differential amplifier. A level translation circuit adjusts the output levels of the differential pair to levels required by circuitry attached to the output terminals of the level translation circuitry. A voltage biasing generation circuit creates bias voltages necessary to establish the currents through the differential amplifier, the amounts of injection current, the level the load currents, and the output voltage levels of the level translation circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.