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Switched CMOS current source compared to enhanced Howland circuit for bio-impedance applications Cover

Switched CMOS current source compared to enhanced Howland circuit for bio-impedance applications

Open Access
|Oct 2024

Figures & Tables

Figure 1:

SCMOSCS Schematic Diagram.
SCMOSCS Schematic Diagram.

Figure 2:

Enhanced Howland Current source Schematic.
Enhanced Howland Current source Schematic.

Figure 3:

Load arrangement using cole model.
Load arrangement using cole model.

Figure 4:

DC analysis results of the Output current versus output voltage.
DC analysis results of the Output current versus output voltage.

Figure 5:

DC analysis results of the output current relative error versus output voltage.
DC analysis results of the output current relative error versus output voltage.

Figure 6:

DC analysis results of the output impedance versus output voltage.
DC analysis results of the output impedance versus output voltage.

Figure 7:

DC analysis results of the output current versus load resistance
DC analysis results of the output current versus load resistance

Figure 8:

Output impedance versus frequency in AC analysis.
Output impedance versus frequency in AC analysis.

Figure 9:

Transient analysis of: (A) output current and (B) output voltage.
Transient analysis of: (A) output current and (B) output voltage.

Figure 10:

Spectra as function of frequency of: (A) output current and (B) output voltage.
Spectra as function of frequency of: (A) output current and (B) output voltage.

Figure 11:

Impedance spectra as a function of frequency.
Impedance spectra as a function of frequency.

CC output current (in μA) considering temperature and voltage supply corners

Topologylout (0 < T < 100°C)lout (1.8 < VCC < 3.3 V)
EHCS250.118 to 250.121249.97 to 250.12
SCMOSCS250.35 to 250.22247.95 to 250.33

Transistor dimensions used in simulation

MOSFETL (μm)W (μm)
M1 and M3140
M2 and M41120
M5 and M6248
M7 and M82480
Language: English
Page range: 145 - 153
Submitted on: Jul 30, 2024
Published on: Oct 5, 2024
Published by: University of Oslo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2024 Pablo Dutra da Silva, Pedro Bertemes Filho, published by University of Oslo
This work is licensed under the Creative Commons Attribution 4.0 License.