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university:courses:electronics:electronics-lab-19 [24 Jul 2017 16:05]
amiclaus change amplitude value to peak-peak
university:courses:electronics:electronics-lab-19 [12 Jul 2019 13:59] (current)
andreeapop
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-====== Activity ​19. The Switched Capacitor ======+====== ActivityThe Switched Capacitor ======
  
 ===== Objective: ===== ===== Objective: =====
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 A switched capacitor is an electronic circuit element used in discrete time signal processing systems. It works by transferring charge into and out of a capacitor when switches are opened and closed. Usually, non-overlapping signals are used to control the switches, often termed Break before Make switching, so that all switches are open for a very short time during the switching transitions. Filters implemented with these elements are termed '​switched-capacitor filters'​. Unlike analog filters, which must be constructed with resistors, capacitors and sometimes inductors whose values are accurately known, switched capacitor filters depend only on the ratios between capacitances and the switching frequency. This makes them much more suitable for use within integrated circuits, where the accurately specified absolute value of components such as resistors and capacitors are not economical to construct. A switched capacitor is an electronic circuit element used in discrete time signal processing systems. It works by transferring charge into and out of a capacitor when switches are opened and closed. Usually, non-overlapping signals are used to control the switches, often termed Break before Make switching, so that all switches are open for a very short time during the switching transitions. Filters implemented with these elements are termed '​switched-capacitor filters'​. Unlike analog filters, which must be constructed with resistors, capacitors and sometimes inductors whose values are accurately known, switched capacitor filters depend only on the ratios between capacitances and the switching frequency. This makes them much more suitable for use within integrated circuits, where the accurately specified absolute value of components such as resistors and capacitors are not economical to construct.
  
-====== ​19.1 The switched capacitor resistor: ======+====== ​ The switched capacitor resistor: ======
  
 The most simple switched capacitor circuit is shown in figure 1, the switched capacitor resistor. It consists of one capacitor C<​sub>​1</​sub>​ and two switches S<​sub>​1</​sub>​ and S<​sub>​2</​sub>​ which connect the capacitor alternately to the input, V<​sub>​IN</​sub>​ and the output, V<​sub>​OUT</​sub>​. ​ The most simple switched capacitor circuit is shown in figure 1, the switched capacitor resistor. It consists of one capacitor C<​sub>​1</​sub>​ and two switches S<​sub>​1</​sub>​ and S<​sub>​2</​sub>​ which connect the capacitor alternately to the input, V<​sub>​IN</​sub>​ and the output, V<​sub>​OUT</​sub>​. ​
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 http://​en.wikipedia.org/​wiki/​Switched_capacitor http://​en.wikipedia.org/​wiki/​Switched_capacitor
  
-====== ​19.2 Example Circuit ======+====== ​ Example Circuit ======
  
 The next step is to build an example circuit using the Switched Capacitor as a resistor. By adding a second capacitor C<​sub>​2</​sub>​ across the output of figure 1, we get the RC low pass circuit shown in figure 2. The next step is to build an example circuit using the Switched Capacitor as a resistor. By adding a second capacitor C<​sub>​2</​sub>​ across the output of figure 1, we get the RC low pass circuit shown in figure 2.
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 How well do these Bode plot curves match a simple RC low pass filter response? How well do these Bode plot curves match a simple RC low pass filter response?
  
-====== ​19.2 Switched capacitor differencing circuit ======+====== ​ Switched capacitor differencing circuit ======
  
 ===== Objective: ===== ===== Objective: =====
university/courses/electronics/electronics-lab-19.txt · Last modified: 12 Jul 2019 13:59 by andreeapop