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A low-transconductance OTA with improved linearity suitable for low-frequency Gm-C filters |
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| Affiliation: | 1. Mahanakorn University of Technology, 140 Cheum-Sampan Road, Nong Chok, Bangkok 10530, Thailand;2. Delft University of Technology, Mekelweg 4, 2628 CD Delft, Zuid Holland, The Netherlands;1. The National ASIC Research Center, Southeast University, Nanjing, 210096, Jiangsu, People''s Republic of China;2. Jiangsu Provincial Key Laboratory of Sensor Network Technology, Southeast University, Nanjing, 210096, People''s Republic of China |
| Abstract: | A fully differential operational transconductance amplifier is presented in this paper with enhanced linearity and low transconductance, suitable for low-frequency Gm-C filters. This paper also proposes a new common-mode feedback scheme that presents low sensitivity to large differential voltage swings at the OTA outputs. The proposed OTA was employed in the design of a fully-integrated Gm-C low-pass filter with a cutoff frequency of 30 kHz. The Gm-C filter was fabricated in a 0.35 μm CMOS technology and presented a THD at the output less than 1% for input signals with differential amplitudes up to 3.2 V. |
| Keywords: | Analog CMOS Continuous-time filters Gm-C filters OTA |
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