Capacitor amplifying circuit and operating method thereof

摘要

A capacitor amplifying circuit and an operating method thereof are disclosed. The capacitor amplifying circuit includes a first current source, a second current source, a current mirror unit, and an output capacitor. There is a proportion relationship between a first current of the first current source and a second current of the second current source. The current mirror unit is coupled between the first current source and the second current source. The current mirror unit includes N stages of current mirror circuit in series, wherein N is larger than or equal to 1. Each of the N stages of current mirror circuit has a proportional constant respectively. Two terminals of the output capacitor are coupled to the current mirror unit and a ground terminal respectively. The equivalent capacitance magnification of the output capacitor is related to the proportional constants based on the proportion relationship.

主权项

1. A capacitor amplifying circuit, comprising:
a first current source, for providing a first current; a second current source, for providing a second current, wherein there is a proportion relationship between the first current and the second current; a current mirror unit, coupled between the first current source and the second current source, the current mirror unit comprising N stages of current mirror circuit in series, wherein N is larger than or equal to 1, each of the N stages of current mirror circuit has a proportional constant respectively; and an output capacitor coupled between one of the first current source and the second current source and the current mirror unit; wherein an equivalent capacitance magnification of the output capacitor is related to the proportional constants based on the proportion relationship, the N stages of current mirror circuit comprise a first stage of current mirror circuit, a second stage of current mirror circuit, and a Nth stage of current mirror circuit, the first stage of current mirror circuit is coupled to an output terminal of an amplifier, and the first stage of current mirror circuit is coupled to the first current source and the second current source respectively.