Review: Static and Dynamic Analysis Methods for Multi-Branch Biasing Circuits

摘要

The fundamental theories and primary structures for the multi-branch self-biasing circuits are reviewed in this paper. First, the Delta V/R and V/R structures illustrating the static current definition mechanism are presented, including the conditions of starting up and entering into a stable equilibrium point. Then, the AC method based on the loop gain evaluation is utilized to analyze difierent types of circuits. On this basis, the laws which can couple the branches of self-biasing circuits to construct a suitable close feedback loop are summarized. By adopting Taiwan Semiconductor Manufacturing Company (TSMC)'s 0.18 mu m complementary metaloxide-semiconductor (CMOS) process with 1.8 V supply voltage, nearly all the circuits mentioned in the paper are simulated in the same branch current condition, which is close to the corresponding calculated results. Therefore, the methods summarized in this paper can be utilized for distinguishing, constructing, and optimizing critical parameters for various structures of the self-biasing circuits.