Name
Abstract | ||
|---|---|---|
In this paper, we present modifications to the constant-gm bias circuit and Miller-lead compensation of operational amplifiers which eliminate or minimize some of their shortcomings. First, we demonstrate how parasitic pad capacitance can cause instability in the constant-gm bias circuit, and show that the transconductance is constant only for specific bias conditions. Next, we suggest a new circuit topology that requires 75% less compensation capacitance to achieve stability. We also discuss problems with Miller-lead compensation that arise from temperature, process, and load variations. Finally, we present a new biasing technique to correct these problems, and, through simulation, demonstrate a 40驴 improvement in phase margin over load current variations. |
Year | DOI | Venue |
|---|---|---|
2004 | 10.1007/s10470-005-1605-2 | IEEE International Symposium on Circuits and Systems |
Keywords | Field | DocType |
operational amplifiers,constant transconductance,compensation,biasing,stability | Capacitance,Parasitic capacitance,Control theory,Computer science,CMOS,Electronic engineering,Phase margin,Transconductance,Operational amplifier,Biasing,Topology (electrical circuits) | Conference |
Volume | Issue | ISSN |
43 | 3 | 0925-1030 |
Citations | PageRank | References |
5 | 2.76 | 2 |
Authors | ||
2 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Sean Nicolson | 1 | 40 | 9.26 |
| Khoman Phang | 2 | 21 | 6.47 |