Analog signal conditioning circuit

In summary, the best approach for suppressing the DC voltage in biomedical applications is to remove it digitally after analog-to-digital conversion. This can be done through either a digital high-pass filter or a calibration procedure. However, it is important to define a lower frequency limit and attenuation rate in order to avoid removing some of the desired signal.
  • #1
shaikss
33
0
Hi,

For any biomedical applications, the sensor output has to be amplified and digitized.
For amplification, we use Instrumentation amplifier. But the output of IA has some dc voltage. So, how to suppress the dc voltage. At the same time, all biomedical signals are low frequency signals in the order of 0 to 20Hz. Which filter technique is better to use?
Is it good to go for Low pass/High pass/Band pass filter? Can you pls throw some light on this?
 
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  • #2
Personally I would remove the dc offset digitally after a/d conversion. Depending on how the data looks you could have a digital high-pass or you could have a calibration procedure where you record the offset.
 
  • #3
You have specified an impossible condition. If your signal has the range of 0 to 20 Hz then you can't remove the DC without removing some of the signal. You must first define a lower frequency limit and an attenuation rate before you can talk about removing the DC.
 

Related to Analog signal conditioning circuit

1. What is an analog signal conditioning circuit?

An analog signal conditioning circuit is a type of electronic circuit that is designed to modify and enhance an analog signal, typically from a sensor or transducer, before it is sent to a data acquisition system for further processing. This circuit can perform functions such as amplification, filtering, and linearization to improve the quality and accuracy of the signal.

2. Why is analog signal conditioning necessary?

Analog signal conditioning is necessary because most sensors and transducers produce signals that are weak, noisy, or nonlinear. These signals need to be conditioned before they can be accurately measured and processed by a data acquisition system. Additionally, the signal may need to be converted to a different voltage or current range to match the input requirements of the system.

3. What are the basic components of an analog signal conditioning circuit?

The basic components of an analog signal conditioning circuit include an amplifier, a filter, and a converter. The amplifier is used to increase the signal strength, the filter removes unwanted noise or frequencies, and the converter changes the signal to a different voltage or current level.

4. How does analog signal conditioning affect the accuracy of a measurement?

Analog signal conditioning plays a crucial role in the accuracy of a measurement. By amplifying and filtering the signal, the noise is reduced and the signal-to-noise ratio is improved, resulting in a more accurate measurement. Additionally, linearization techniques can be applied to compensate for nonlinearity in the signal, further improving accuracy.

5. What are some common applications of analog signal conditioning circuits?

Analog signal conditioning circuits are used in a wide range of applications, including industrial process control, medical devices, automotive systems, and scientific instrumentation. They are also commonly used in data acquisition systems for various types of measurements, such as temperature, pressure, and strain.

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