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This work presents an architecture for Nauta fully differential operational transconductance amplifier that requires no additional circuitry for calibration. This design operates with a power supply of 0.25-V, implemented in a 130-nm digital CMOS process. By operating in the weak inversion region and using the transistor array approach, this OTA shows voltage reduction and stable gain using halo implanted...
In this paper, we present a single-bit clock-less asynchronous delta–sigma modulator (ADSM) operating at just 0.25 V power supply. Several circuit approaches were employed to enable such low-voltage operation and maintain high performance. One approach involved utilizing bulk-driven transistors in subthreshold region with transconductance-enhancement topology. Another approach was to employ distributed...
This paper presents a high gain bulk-driven Miller OTA operating at just 0.25-V power supply in a 130-nm digital CMOS process. The amplifier operates in weak-inversion region with input bulk-driven differential pair with negative resistance source degeneration. In addition, distributed layout configuration is used for all transistors to mitigate the effect of halo implants for higher output impedance...
In this paper a simple and efficient way to enhance the transconductance Gm for bulk-driven sub-threshold differential pair in nanometer CMOS process is presented. This approach is based on a type of positive feedback source degeneration, which does not depend on geometry parameters or biasing voltages, and leads to improved values for the DC gain and the unity gain frequency, without increasing power...
In this paper a hybrid multi-tanh bulk-driven input stage OTA for low total harmonic distortion (THD) biomedical Gm-C applications in weak inversion is presented. The proposed OTA was successfully simulated in an 130-nm IBM CMOS process. The simulations show an open loop gain of 46.4 dB and a unit gain frequency of 125 Hz with only 500 mV of power supply voltage and just 25 nW of power consumption...
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