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Amplifier circuit and analog-to-digital circuit using the same

  • US 20050219111A1
  • Filed: 03/08/2005
  • Published: 10/06/2005
  • Est. Priority Date: 03/24/2004
  • Status: Active Grant
First Claim
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1. An amplifier circuit of a capacitive coupling type in which any of a plurality of input signals is inputted to one end of capacitance and a voltage appearing on the other end thereof is sampled, the amplifier circuit including:

  • a plurality of switches for use with input signals, provided respectively at path through which the plurality of input signals lead to one end of the capacitance; and

    a switch for use with reference, provided at path through which a predetermined reference voltage signal leads to one end of the capacitance, wherein each of the switches for use with input signals is directly connected to one end of the capacitance.

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