Charge-domain filter apparatus and operation method thereof

摘要

A charge-domain filter (CDF) apparatus and an operation method thereof are provided. The CDF apparatus includes an input-signal combination network (ISCN), a switch-capacitor network (SCN) module, an output-signal combination network (OSCN), and a bandwidth compensation network (BCN). The input terminal of the ISCN receives an input signal. The SCN module is connected between the ISCN and the OSCN. The OSCN outputs an output signal of the CDF apparatus. The BCN senses the signal of the SCN module, senses the signal of the OSCN, or senses the signal of each of the SCN module and the OSCN, and correspondingly generates a forward signal or a feedback signal for the ISCN or the OSCN according to the sensing result to perform bandwidth compensation.

主权项

1. A charge-domain filter (CDF) apparatus, comprising:
an input-signal combination network (ISCN), wherein at least one input terminal of the ISCN receives at least one input signal; a switched-capacitor network (SCN) module, wherein at least one input terminal of the SCN module is respectively connected to at least one output terminal of the ISCN; an output-signal combination network (OSCN), wherein at least one input terminal of the OSCN is respectively connected to at least one output terminal of the SCN module, and the OSCN outputs at least one output signal; and a bandwidth compensation network (BCN) coupled to the SCN module, wherein the BCN senses a signal of the SCN module, senses a signal of the OSCN, or senses a signal of each of the SCN module and the OSCN, and correspondingly generates at least one feedback signal or at least one forward signal for the ISCN or the OSCN to perform bandwidth compensation according to a sensing result, wherein the BCN comprises: a forward unit, wherein at least one input terminal of the forward unit is coupled to the SCN module, coupled to the OSCN, or coupled to the SCN module and the OSCN, and at least one output terminal of the forward unit is coupled to the OSCN to provide the at least one forward signal to the OSCN to perform bandwidth compensation, wherein the forward unit comprises: at least one configurable power-reference cell adjusting a portion or all of the signal of the SCN module and the signal of the OSCN to serve as at least one first sensing power; at least one programmable-delay cell delaying the at least one first sensing power; and a signal selector, selecting a portion or all of the at least one first sensing power delayed to serve as the at least one forward signal, and outputting the at least one forward signal to the OSCN.