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A slew rate enhancement technique for operational amplifiers based on a tunable active gm-based capacitance multiplication circuit.
| Content Provider | CiteSeerX |
|---|---|
| Author | Suryanarayan, Ram Gupta, Anubhav Blalock, Travis N. |
| Abstract | A slew rate enhancement technique for operational amplifiers using a tunable active Gm-based current-mode capacitance multiplication circuit instead of the standard Miller compensation capacitor is developed. Low power and low area solutions for driving large capacitive loads are enabled by this technique. In a prototype amplifier, a 0.5 pF MOSFET is multiplied to an effective value of 285 pF, setting the dominant pole at 3 Hz. The slew rate, however, is controlled by the physical MOSFET capacitor. A slew rate as high as 1.5 V/µs is obtained for a standard two stage folded cascode opamp with a 2.5 µA differential pair tail current. An open loop gain of 101 dB and a phase margin of 56 ° are observed. |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Slew Rate Enhancement Technique Operational Amplifier Slew Rate Standard Miller Compensation Capacitor Low Area Solution Open Loop Gain Differential Pair Tail Cascode Opamp Prototype Amplifier Effective Value Dominant Pole Physical Mosfet Capacitor Large Capacitive Load Pf Mosfet Low Power Phase Margin |
| Content Type | Text |
