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US 8,710,920 B2Granted
Charge domain filter and method thereof
AssigneeIndustrial Technology Research Institute
InventorMing-Feng Huang
Life of this patent
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Abstract
A charge domain filter (CDF) and a method thereof are provided. The CDF includes an amplifier, a first switch-capacitor network (SCN), a second SCN, a third SCN and a fourth SCN. Input terminals of the first and the second SCNs are coupled to first and second output terminals of the amplifier, respectively. Input and output terminals of the third SCN are coupled to output terminals of the first and the second SCNs, respectively. Input and output terminals of the fourth SCN are coupled to output terminals of the second and the first SCNs, respectively. A mode control terminal of the third SCN receives a first mode signal to set an impulse response mode of the third SCN. A mode control terminal of the fourth SCN receives a second mode signal to set an impulse response mode of the fourth SCN.
Claims40
A charge domain filter (CDF), comprising:
- an 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 amplifier;
- at least one second SCN, comprising an input terminal coupled to the second output terminal of the amplifier;
- at least one third SCN, wherein an input terminal of the third SCN is coupled to an output terminal of the first SCN, an output terminal of the third SCN is coupled to an output terminal of the second SCN, and a mode control terminal of the third SCN receives a first mode signal to set an impulse response mode of the third SCN;
- and
- at least one fourth SCN, wherein an input terminal of the fourth SCN is coupled to the output terminal of the second SCN, an output terminal of the fourth SCN is coupled to the output terminal of the first SCN, and a mode control terminal of the fourth SCN receives a second mode signal to set an impulse response mode of the fourth SCN.
3 more elements
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, wherein an input terminal of the third SCN is coupled to an output terminal of the first SCN, and an input terminal of the fourth SCN is coupled to an output terminal of the second 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 to obtain a first summation result;
- summating an output of the second SCN and an output of the third SCN to obtain 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, wherein a mode control terminal of the third SCN receives the first mode signal;
- and
- setting an impulse response mode of the fourth SCN through a second mode signal, wherein a mode control terminal of the fourth SCN receives the second mode signal.
8 more elements
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.
5 more elements
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.
6 more elements
Dependencies are inferred from the claim text.