中圖分類號： TN432 文獻(xiàn)標(biāo)識碼： A DOI：10.16157/j.issn.0258-7998.200079 中文引用格式： 吳鋒霖，李思臻，余凱，等. 一種增益提升和擺率增強(qiáng)的運(yùn)算跨導(dǎo)放大器[J].電子技術(shù)應(yīng)用，2020，46(7)：65-69. 英文引用格式： Wu Fenglin，Li Sizhen，Yu Kai，et al. An operational transconductance amplifier with gain boosting and slew rate enhancement[J]. Application of Electronic Technique，2020，46(7)：65-69.
An operational transconductance amplifier with gain boosting and slew rate enhancement
Wu Fenglin，Li Sizhen，Yu Kai，Zhang Guohao
School of Information Engineering，Guangdong University of Technology，Guangzhou 510006，China
Abstract： The gain and the slew rate of conventional current-mirror operational transconductance amplifiers(OTAs) are seriously limited under low voltage and low power consumption conditions. To solve the problem, an OTA based on complementary flipped voltage follower(FVF) is proposed. By effectively increasing the transconductance and the output current, the proposed OTA improves the gain and the slew rate. The design and verification is performed under SMIC 0.18 μm CMOS process. The simulation results show that, at 1.8 V supply voltage, compared with the conventional current-mirror OTA which has the same static power consumption, the proposed OTA with complementary FVF improves the gain by 11 dB, enhances the unit gain bandwidth by 2 times, boosts the positive and negative slew rates by 6.7 and 6.1 times, respectively. The proposed OTA achieves a better performance than the OTA with single FVF.
Key words : operational transconductance amplifier；gain boosting；slew rate enhancement；low voltage；low power
