This study presents a new low-voltage and low-power, mixed-mode, universal Gm-C filter capable of generating simultaneous filtering outputs. The proposed circuit employs only 19 inverters as operational transconductance amplifiers, and 2 grounded capacitors in carbon nanotube field-effect transistor (CNTFET) technology. However, due to the proper use of subthreshold transistors biased at ±0.25 V supply, the power consumption of the proposed circuit is reduced effectively. Furthermore, as the HSPICE simulation results show, the proposed filter consumes only 11.66 µW of power, while its total harmonic distortion is obtained −55.4 dB at 100 MHz centre frequency. Moreover, the input referred noise values at 100 MHz are reduced to 11.57 nV/ Hz and 760 fA Hz in voltage and current modes, respectively.
This paper presents a new low‐voltage and low‐power mixed‐mode universal active filter, using only 12 carbon nanotube field effect transistors (CNTFETs) and 2 grounded capacitors to improve the noise performance of the proposed circuit. Due to the use of subthreshold transistors biased at ±0.2 V supply voltage, the power consumption of the proposed multi input‐single output (MISO) filter is only 850 nW at 19 MHz center frequency. On the other hand, relaxing from any matching components, the center frequency and quality factor of the proposed filter can be tuned electronically with low sensitivity to the values of the active and passive elements. Furthermore, the active chip area of the proposed filter is significantly reduced to 0.047 μm2, in 32 nm CNTFET technology. Therefore, as the HSPICE simulation results show, the input referred noise values at 19 MHz are reduced to 15.5 nV/Hz and 185 fA/Hz in voltage and current modes, respectively. It is also shown that, by changing the number of nanotubes in the CNTFET structure, a very good power‐frequency trade‐off can be achieved for low‐power GHz applications.
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