Pulse Filtering Circuit

A pulse filtering circuit with two input ports and two output ports comprising:

• a first signal path with a first buffer unit, a first comparison unit, and a first shaping unit;
• and
• a second signal path with a second buffer unit, a second comparison unit, and a second shaping unit;
• wherein
• each of the buffer unit comprising one or more digital inverters in series, with the input to the first digital inverter serving as the input to the pulse filtering circuit, and an output of the last digital inverter serving as an output of the buffer unit, optionally such buffer unit can be omitted;
• and
• each of the first comparison unit and the second comparison unit has four ports, which are a first port, a second port, a third port and a fourth port;
• wherein
• the first port of each comparison unit serves as an input control port, the second port of each comparison unit serves as an output port, the third port serves as a fixed potential port, and the fourth port serves as a floating potential input port;
• and
• the output of the first buffer unit connects to the input control port of the first comparison unit and the floating potential input port of the second comparison unit, the output of the second buffer unit connects to the input control port of the second comparison unit and the floating potential input port of the first comparison unit, or alternatively the output of the first buffer unit connects to the input control port of the second comparison unit and the floating potential input port of the first comparison unit, the output of the second buffer unit connects to the input control port of the first comparison unit and the floating potential input port of the second comparison unit;
• and
• signal from each of the floating potential input port is passed to the corresponding output port when a voltage difference between the corresponding input control port and the floating potential input port exceeds a voltage threshold of the comparison unit, otherwise the corresponding output port provides an output equal to the fixed potential at the third port;
• and
• the first shaping unit comprising one or more digital inverters in series, with an input to the first digital inverter connecting to the output of the first comparison unit, and an output of the last digital inverter serving as a first output of the pulse filtering circuit, and the second shaping unit comprising one or more digital inverters in series, with an input to the first digital inverter connecting to the output of the second comparison unit, and an output of the last digital inverter serving as a second output of the pulse filtering circuit;
• optionally, each such buffer unit can be omitted.

A pulse filtering circuit device, comprising:

• two signal paths comprising a first path and a second path;
• the first path comprising a first buffer circuit, a first inverter unit and a first shaping circuit;
• the second path comprising a second buffer circuit, a second inverter unit and a second shaping circuit;
• wherein each of the first inverter unit and the second inverter unit has four ports which are a first port, a second port, a third port and a fourth port, wherein the first port serves as an input end of the first inverter unit or the second inverter unit, the second port serves as an output end of the first inverter unit or the second inverter unit, the third port serves as a fixed potential end of the first inverter unit or the second inverter unit, and the fourth port serves as a floating potential end of the first inverter unit or the second inverter unit;
• functions of the first inverter unit or the second inverter unit are that:
• an output electrical signal of the second port is controlled by a voltage difference between the first port and the fourth port, an electrical signal of the fourth port is transmitted to the second port through one of the first inverter unit and the second inverter unit if an absolute value of the voltage difference between the first port and the fourth port is greater than a voltage threshold VTH of the other of the first inverter unit and the second inverter unit;
• and the electrical signal of the fourth port is unable to be transmitted to the second port through one of the first inverter unit and the second inverter unit if the absolute value of the voltage difference between the first port and the fourth port is not greater than the voltage threshold VTH of the other of the first inverter unit and the second inverter unit.