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university:courses:electronics:electronics-lab-heartbeat [25 Jun 2020 22:07] – external edit university:courses:electronics:electronics-lab-heartbeat [26 Oct 2021 01:10] – Update LTspice schematic, clarify note on OP284 in LTspice vs. OP484 in reality Mark Thoren
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 <WRAP centeralign> Figure 1 Heartbeat Measurement Circuit </WRAP> <WRAP centeralign> Figure 1 Heartbeat Measurement Circuit </WRAP>
  
-Since the real circuit uses quad OP484FPZ from the ADALP2000 Analog Parts Kit, the schematic design was implemented with multiple OP184 Precision Rail-to-Rail Operational Amplifiers. They are dual supplied (± 5V) from the ADALM2000 module, operating on a range of 10V.+The LTspice simulation uses OP284s, included in the standard set of LTspice models. The actual circuit is constructed with the quad OP484FPZ from the ADALP2000 Analog Parts Kit, powered by ± 5V from the ADALM2000 module (a total supply voltage of 10V.)
  
 ====IR LED==== ====IR LED====
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 The input signal from the heartbeat measurement setup is fed into a Differentiator Amplifier Circuit(([[http://www.electronics-tutorials.ws/opamp/opamp_7.html|Differentiator Amplifier]])) (C<sub>1</sub>, A<sub>1</sub>, R<sub>3</sub>). The capacitor blocks any DC content, C<sub>1</sub> and R<sub>3</sub> behaving as a high pass filter with the cut-off frequency F<sub>c1</sub> being determined by the following formula: The input signal from the heartbeat measurement setup is fed into a Differentiator Amplifier Circuit(([[http://www.electronics-tutorials.ws/opamp/opamp_7.html|Differentiator Amplifier]])) (C<sub>1</sub>, A<sub>1</sub>, R<sub>3</sub>). The capacitor blocks any DC content, C<sub>1</sub> and R<sub>3</sub> behaving as a high pass filter with the cut-off frequency F<sub>c1</sub> being determined by the following formula:
-<WRAP centeralign><m>F_c1=1/{2 pi R_3C_1}</m></WRAP>+<WRAP centeralign><m>F_c1=1/{2 pi R_1C_1}</m></WRAP>
 Besides filtering, this stage serves also as an amplifier taking as input the current (I<sub>A1</sub>), and generating at the output an inverted voltage (V<sub>A1</sub>) based on the negative feedback resistance (R<sub>3</sub>):  Besides filtering, this stage serves also as an amplifier taking as input the current (I<sub>A1</sub>), and generating at the output an inverted voltage (V<sub>A1</sub>) based on the negative feedback resistance (R<sub>3</sub>): 
-<WRAP centeralign><m>V_A1=-I_A1*R_3</m></WRAP>+<WRAP centeralign><m>V_A1=-I_A1*R_1</m></WRAP>
  
 ====Active Low-Pass Filter=== ====Active Low-Pass Filter===
university/courses/electronics/electronics-lab-heartbeat.txt · Last modified: 30 Jan 2023 09:19 by Antoniu Miclaus

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