Charge domain filter and method thereof

A method of a charge domain filter (CDF), comprising:

• providing an amplifier, at least one first switch-capacitor network (SCN), at least one second SCN, at least one third SCN and at least one fourth SCN;
• converting an input signal into a first input signal and a second input signal with the amplifier;
• sampling the first input signal with the at least one first SCN;
• sampling the second input signal with the at least one second SCN;
• summating an output of the first SCN and an output of the fourth SCN, so as to acquire a first summation result;
• summating an output of the second SCN and an output of the third SCN, so as to acquire a second summation result;
• sampling the first summation result with the at least one third SCN;
• sampling the second summation result with the at least one fourth SCN;
• setting an impulse response mode of the third SCN through a first mode signal;
• and
• setting an impulse response mode of the fourth SCN through a second mode signal.

A charge domain filter (CDF), comprising:

• an input amplifier, comprising a first output terminal and a second output terminal;
• at least one first switch-capacitor network (SCN), comprising an input terminal coupled to the first output terminal of the input amplifier;
• at least one second SCN, comprising an input terminal coupled to the second output terminal of the input amplifier;
• at least one third SCN, comprising an input terminal coupled to an output terminal of the first SCN;
• at least one fourth SCN, comprising an input terminal coupled to an output terminal of the second SCN;
• a first output amplifier, wherein a first input terminal of the first output amplifier is coupled to an output terminal of the third SCN, a second input terminal of the first output amplifier is coupled to an output terminal of the second SCN, and an output terminal of the first output amplifier is used as a first output terminal of the CDF;
• and
• a second output amplifier, wherein a first input terminal of the second output amplifier is coupled to an output terminal of the fourth SCN, a second input terminal of the second output amplifier is coupled to the output terminal of the first SCN, and an output terminal of the second output amplifier is used as a second output terminal of the CDF.

A method of a charge domain filter (CDF), comprising:

• providing an input amplifier, at least one first switch-capacitor network (SCN), at least one second SCN, at least one third SCN, at least one fourth SCN, a first output amplifier and a second output amplifier;
• converting an input signal into a first input signal and a second input signal with the input amplifier;
• sampling the first input signal with the at least one first SCN;
• sampling the second input signal with the at least one second SCN;
• sampling an output of the first SCN with the at least one third SCN;
• sampling an output of the second SCN with the at least one fourth SCN;
• receiving and amplifying an output of the third SCN and the output of the second SCN with the first output amplifier, so as to provide a first output of the CDF;
• and
• receiving and amplifying an output of the fourth SCN and the output of the first SCN with the second output amplifier, so as to provide a second output of the CDF.