Patent ID: 7825722
Filing Date: 2010-11-02
Classification: H03F,H03H

Abstract:
1. A high pass filter chip with a fully-differential sensing device circuit, wherein the fully-differential sensing device circuit comprising: a first amplifier circuit including a first transistor and a second transistor, wherein a base of the first transistor is coupled to a base of the second transistor, and a positive signal input source is coupled to the base of the first transistor; a second amplifier circuit including a third transistor and a fourth transistor, wherein a base of the third transistor is coupled to a base of the fourth transistor, and a negative signal input source is coupled to the base of the fourth transistor; and a miller capacitor module coupled between the first amplifier circuit and the second amplifier circuit, which includes a third amplifier, wherein a first input terminal of the third amplifier is coupled to the base of the second transistor, and a second input terminal of the third amplifier is coupled to the base of the third transistor; wherein a first signal output of the fully-differential sensing device circuit is coupled to a first output terminal of the third amplifier and a second signal output of the fully-differential sensing device circuit is coupled to the second output terminal of the third amplifier.