Patent ID: 9054726
Filing Date: 2015-06-09
Classification: G11C,H03F,H03H,H03M

Abstract:
1. A passive amplification circuit comprising: an input terminal group configured to input a differential signal; first to fourth capacitances charged with voltages of a differential signal in a sampling operation; a plurality of switches configured to switch a connection relation of the first to fourth capacitances between a first state of the sampling operation and a second state of an amplification operation; and an output terminal group configured to output the differential signal amplified in the amplification operation, wherein in the first state, the first capacitance and the second capacitance are connected in parallel and the third capacitance and the fourth capacitance are connected in parallel, wherein in the second state, the first capacitance and the second capacitance are connected in series and the third capacitance and the fourth capacitance are connected in series, wherein each of one end and the other end of each of the first to fourth capacitances is connected with any one of the plurality of switches, the output terminal group, a power supply voltage and a ground voltage, wherein one end and the other end of each of the plurality of switches is connected with any one of the first to fourth capacitances, the input terminal group, the output terminal group, the power supply voltage and the ground voltage; wherein the plurality of switches comprise: a first switch group set to a conductive state in the first state and a block-off state in the second state; and a second switch group set to the block-off state in the first state and the conductive state in the second state, wherein the one end of each of the switches of the first switch group is connected with any one of the input terminals of the input terminal group and the other end thereof is connected with any one of the first to fourth capacitances, and wherein the one end of each of the switches of the second switch group is connected with the power supply voltage or the ground voltage, and the other end thereof is connected with any one of the first to fourth capacitances, wherein the input terminal group comprises: a positive side input terminal configured to input a positive side voltage of the differential signal; and a negative side input terminal configured to input a negative side voltage of the differential signal, wherein the output terminal group comprises: a positive side output terminal configured to output the positive side voltage of the amplified differential signal; and a negative side output terminal configured to output the negative side voltage of the amplified differential signal, wherein in the first state, the first to fourth capacitances are connected in parallel between the positive side input terminal and the negative side input terminal, wherein in the second state, the first capacitance is connected between the power supply voltage and the negative side output terminal, wherein in the second state, the second capacitance is connected between the negative side output terminal and the ground voltage, wherein in the second state, the third capacitance is connected between the power supply voltage and the positive side output terminal, wherein in the second state, the fourth capacitance is connected between the positive side output terminal and the ground voltage, and wherein the first capacitance and the third capacitance have an identical first capacitance value, and the second capacitance of the fourth capacitance have an identical second capacitance value.