About this document
Preheat Starter Circuit for Ballasts by chag1956 is a document available to read on EtoBox.
This circuit provides a 16-step, ultralow-noise variable gain amplifier (VGA) with gains ranging from 0 to 45 dB in 3 dB steps. It distributes the total gain across multiple op-amp stages to increase bandwidth. Each stage switches in a successive gain factor using a binary code from a TTL source, achieving low noise down to 3 nV/√Hz. The design solves problems of high noise, limited input/output ranges, and nonlinear characteristics in single-chip VGA designs.
- Author
- chag1956
- Language
- EN