Bias-line compensation in multi-stage amplifiers
In this paper, a novel bias-line compensation (BLC) using inverting current buffer for multi-stage amplifiers is proposed. This technique uses a compensation capacitor connected between the output node and low-impedance bias line, which helps in increasing the bandwidth and improving PSRR. The propo...
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Published in | 2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS) pp. 1 - 4 |
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Main Authors | , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.08.2011
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Subjects | |
Online Access | Get full text |
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Summary: | In this paper, a novel bias-line compensation (BLC) using inverting current buffer for multi-stage amplifiers is proposed. This technique uses a compensation capacitor connected between the output node and low-impedance bias line, which helps in increasing the bandwidth and improving PSRR. The proposed technique is implemented in a widely-adopted low-voltage, high-gain and wide-swing pseudo-class AB amplifier [1]. The amplifier is conventionally compensated with reverse-nested Miller compensation. The results show that bias-line compensation improves the bandwidth by 50% and PSRR by 5dB with ±1.25V power supplies. The amplifier with bias-line compensation is stable for a capacitive load in the range of 1pF to 200pF. The chip was fabricated in a 0.5μm 2P3M process. Measurement results validate the effectiveness of the proposed method. |
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ISBN: | 9781612848563 1612848567 |
ISSN: | 1548-3746 1558-3899 |
DOI: | 10.1109/MWSCAS.2011.6026337 |