Multipath common-mode feedback scheme suitable for high-frequency two-stage amplifiers |
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| Authors: | Gupta A.K. Dhanasekaran V. Soundarapandian K. Sanchez-Sinencio E. |
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| Affiliation: | Dept. of Electr. Eng., Texas A&M Univ., Dallas, TX, USA; |
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| Abstract: | A method for stabilising the common-mode feedback (CMFB) loop in high-speed fully differential two-stage amplifiers is presented. Existing approaches may prove to be inadequate for high-speed designs. The problem becomes acute because of positive DC feedback by external network, which leads to 'latching states'. The proposed multipath approach avoids the latching states while maintaining the stability of the CMFB loop. |
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