Filter for electric signals consisting of switches, capacitors and amplifiers

In an electric filter comprised of switches, capacitors, and amplifiers, the combination comprising:

• at least one voltage reversal switch operating to produce a voltage at first and second switch terminals, subsequent to actuation of the voltage reversal switch, which is equal in magnitude but of opposite polarity to the voltage at such terminals prior to actuation of the voltage reversal switch, said voltage reversal switch comprising;
• a capacitor for storing the voltage presented thereto during a first clock pulse phase;
• amplifying means;
• first connecting means including said amplifying means and a first switch operated during a first clock pulse phase for connecting said second terminal to said capacitor;
• second connecting means including said amplifying means and a second switch operated during a second clock pulse phase for connecting said capacitor to said second terminal;
• said first connection means including a third switch operated during the first clock pulse phase and connected in series with said first switch;
• a fourth switch operated during the second clock pulse phase and connected between one end of said capacitor and said amplifying means;
• a fifth switch operated during the first clock pulse phase and connected between said amplifying means and said reference potential;
• and
• a sixth switch operating during the second clock pulse phase and connected between said amplifying means and said capacitor.

In an electric filter comprised of switches, capacitors and amplifiers, the combination comprising:

• at least one three-pole voltage reversal switch operating to produce a voltage at first and second switch terminals, subsequent to actuation of the voltage reversal switch, which is equal in magnitude but of opposite polarity to the voltage at such terminals prior to actuation of the voltage reversal switch, said voltage reversal switch comprising:
• a capacitor for storing the voltage presented thereto during a first clock pulse phase;
• an operational amplifier having inverting and non-inverting input terminals;
• means for connecting a third terminal of said three-pole switch to a reference potential and to said non-inverting input;
• a first switch operated during a first clock pulse phase for connecting said second terminal and said non-inverting input to said capacitor;
• a second switch operated during a second clock pulse phase for connecting said capacitor to said non-inverting input and to said second terminal;
• a third switch operated during the first clock pulse phase and connected in series with said first switch and connected to said first terminal;
• a fourth switch operated during the second clock pulse phase and connected between one end of said capacitor and said reference potential;
• a fifth switch operated during the first clock pulse phase and connected between said reference potential and the reference node of an exterior network connected to the three-pole switch;
• and
• a sixth switch operated during the second clock pulse phase and connected between the output of said operational amplifier and the reference made of said exterior network.