This document discusses different biasing schemes for BJTs, including fixed bias, collector base bias, and voltage divider bias. It explains how each biasing scheme works, its advantages and disadvantages, typical applications, and how stability is achieved. The key points are: 1) Different biasing schemes like fixed bias, collector base bias and voltage divider bias are used to set the operating point of BJTs and provide stability against variations in temperature, transistor parameters etc. 2) Collector base bias provides better stability than fixed bias by using negative feedback, but it reduces gain. Voltage divider bias is most widely used as it provides both stable biasing and high gain. 3) Stability is improved by