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Current mode single-input multi-output MOSFET-only filter
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DOI：10.1016/j.aeue.2017.06.037.png)
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Abstract
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In this paper, a very simple topology of a current mode MOSFET-only filter with single-input and multi output is proposed. It is very important to emphasize that it is possible to obtain five of the filter functions, namely low-pass (LP), band-pass (BP), high-pass (HP), band-stop (BS) and all-pass (AP) using the proposed topology without using external passive elements. The core circuit of the proposed filter employs only four MOS transistors; therefore, it occupies very small chip area. It is also possible to adjust the filter gain with the biasing voltage. In addition, the circuit exhibits a very low input impedance and also high output impedances which make it possible for cascading. The MOSFET capacitances which determine the transfer functions are all grounded, so physical capacitances can be used instead of MOSFET parasitic capacitances to operate the filter at very low frequencies. Moreover, proposed filter structure has low supply voltage as 1 V in order to be applicable to low voltage operations. Detailed simulation results, including noise and Monte Carlo analysis, are provided using 0.18 pm TSMC technology parameters to verify the feasibility of the filter circuit. (C) 2017 Elsevier GmbH. All rights reserved.
Keywords:
Current mode
MOSFET-only filters
Analog filters
Low voltage
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