Amplifier circuit and analog-to-digital circuit using the same
First Claim
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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Accused Products
Abstract
One or more input capacitors are connected to an inverting input terminal of an operational amplifier. Connected to the respective input capacitors are switches for on-off control of the input of an input signal, switches for on-off control of the input of another input signal, switches for on-off control of the input of a higher reference voltage and switches for on-off control of the input of a lower reference voltage. The switches for on-off control of the input of an input signal and the switches for on-off control of the input of another input signal are controlled by independent control signals.
10 Citations
5 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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5-20. -20. (canceled)
Specification