Design of 0.13-μm cmos vlf current mode preamplifier for biomedical application
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Date
2017-06
Authors
Mohamad Amirul Zakaria
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Abstract
This report presents the design of a very low frequency (VLF) current mode preamplifier for the biomedical application. The biggest challenge in designing a VLF current mode preamplifier is to obtain the low noise and low power consumption in the design. The design of VLF current mode preamplifier operates at frequency 1 Hz to 10 kHz. In order to implement the VLF current mode preamplifier with the low noise and low power consumption for the biomedical application, the most optimum amplifier topology must be provided for the design of the VLF current mode preamplifier. Besides that, the power consumption also must be optimized in the design of the VLF current mode preamplifier to fulfill the design specification. The inverting op-amp is the most optimum amplifier to achieve the objectives of this project after making comparisons between different topologies. The design was implemented in Silterra’s 0.13-μm CMOS process technology. The schematic construction and pre-layout simulation of the VLF current mode preamplifier design were done using Cadence Tool to justify the performance metrics. Results obtained from the pre-layout simulation were compared with the design specification set. By using the proposed topology, the maximum voltage gain of the VLF current mode preamplifier was 60 dB while the input-referred current noise density was 585.6 fA / √Hz for the post-optimization. The power consumption of the whole design was on 8.34 μW for the post-optimization at a supply voltage of 1 V. It can be concluded that the design of the VLF current mode preamplifier is successful with all performance metrics achieving the design specification.