© The Institution of Engineering and Technology
A class AB one-stage fully differential amplifier is described. It includes adaptive biasing techniques to the conventional class A differential amplifier that improve linearity, gain-bandwidth product and slew rate, maintaining the same DC bias currents and supply voltage requirements. Boosting of dynamic currents for large input signals takes place at the output branches, without internal replication of these currents. This leads to a nearly 100% current efficiency. Measurement results for a 0.5 μm CMOS test chip prototype validate the proposal.
References
-
-
1)
-
2. Ramirez-Angulo, J., Carvajal, R.G., Lopez-Martin, A.: ‘A free but efficient low voltage class AB two stage operational amplifier’, Trans. Circuits Syst. II, 2006, 53, (7), pp. 568–571 (doi: 10.1109/TCSII.2006.875320).
-
2)
-
5. Chatterje, S., Tsividis, Y., Kinget, P.: ‘A 0.5-V bulk-input fully differential operational transconductance amplifier’. European Solid State Circuits Conf., Leuven, Belgium, September 2004, pp. 147–150, .
-
3)
-
4. Zuo, L., Islam, S.K.: ‘Low-voltage bulk-driven operational amplifier with improved transconductance’, IEEE Trans. Circuits Syst. I, Regul. Pap., 2013, 60, (8), pp. 2084–2091 (doi: 10.1109/TCSI.2013.2239161).
-
4)
-
4. Valero Bernal, M.R., Celma, S., Medrano, N., et al: ‘An ultralow-power low-voltage class-AB fully differential OpAmp for long-life autonomous portable equipment’, Trans. Circuits Syst. II, 2012, 59, (10), pp. 643–647 (doi: 10.1109/TCSII.2012.2213361).
-
5)
-
3. Lopez-Martin, A., Garde, M.P., Ramirez-Angulo, J.: ‘Class AB differential difference amplifier for enhanced common-mode feedback’, Electron. Lett., 2017, 53, (7), pp. 454–456 (doi: 10.1049/el.2017.0347).
-
6)
-
6. Baswa, S., Lopez-Marin, A.J., Angulo, J.R., Carvajal, R.G.: ‘Low-voltage micropower super class AB CMOS OTA’, Eletron. Lett., 2004, 40, (4), pp. 216–217 (doi: 10.1049/el:20040166).
-
7)
-
6. Figueiredo, M., Santos-Tavares, R., Santin, E., et al: ‘A two-stage fully differential inverter-based self-biased CMOS amplifier with high efficiency’, Trans. Circuits Syst. I, 2011, 58, (7), pp. 1591–1603 (doi: 10.1109/TCSI.2011.2150910).
-
8)
-
9. Cabrera-Bernal, E., Pennisi, S., Grasso, A.D., et al: ‘0.7-V three-stage class-AB CMOS operational transconductance amplifier’, Trans. Circuits Syst. I, 2016, 63, (11), pp. 1807–1815 (doi: 10.1109/TCSI.2016.2597440).
-
9)
-
10. Sutula, S., Dei, M., Teres, L., et al: ‘Variable-mirror amplifier: a new family of process-independent class-AB single-stage OTAs for low-power SC circuits’, Trans. Circuits Syst. I, 2016, 63, (8), pp. 1101–1110 (doi: 10.1109/TCSI.2016.2577838).
-
10)
-
8. Surkanti, P.R., Furth, P.M.: ‘Converting a three-stage pseudoclass-AB amplifier to a true-class-AB amplifier’, Trans. Circuits Syst. II, 2012, 59, (4), pp. 229–233 (doi: 10.1109/TCSII.2012.2188462).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.2070
Related content
content/journals/10.1049/el.2017.2070
pub_keyword,iet_inspecKeyword,pub_concept
6
6