This document introduces a power gain stage for a monolithic amplifier, which has a low drift and stable gain characteristics.
The document explains that standard monolithic amplifiers are limited in output power due to supply levels and transistor size constraints. It details how a separate power gain stage, often placed within the feedback loop, can provide necessary current or voltage boosting while preserving low drift and stable gain characteristics.
Several specific circuit configurations are presented for different applications. These include a 150mA output stage using the LT1010 monolithic booster, a high-current discrete stage capable of 3A output, and an ultrafast fed-forward current booster utilizing the LT1012. The note also covers simple voltage gain stages using CMOS logic inverters or bipolar transistors to achieve rail-to-rail operation.
| Output Current (LT1010) | 150mA |
|---|---|
| Full-Power Bandwidth | 7.5MHz |
| 3dB Point | 14MHz |
A power gain stage, sometimes called a booster, is a separate output stage placed within an amplifier's feedback loop to provide greater output power.
It is necessary when voltage or current gain is needed beyond what standard monolithic amplifiers can deliver due to supply level and transistor size limitations.