Integrated circuit device and electronic instrument
AssigneeSeiko Epson Corporation
InventorsAkihiro FUKUZAWA, Satoru ITO, Nobuyuki IMAI
Life of this patent
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Abstract
An integrated circuit device includes an amplifier circuit that includes first to Nth amplifiers that are cascaded and receives an input signal, an A/D converter that performs an A/D conversion process on a signal amplified by the amplifier circuit, first to Nth D/A converters that are provided corresponding to the first to Nth amplifiers and used to perform an offset adjustment of the first to Nth amplifiers, and a control circuit that sets an offset adjustment of the first to Nth amplifiers using the first to Nth D/A converters and a gain adjustment of the first to Nth amplifiers.
Claims18
An integrated circuit device comprising:
- an amplifier circuit that includes first to Nth (N is an integer equal to or larger than two) amplifiers and receives an input signal, the first to Nth amplifiers being cascaded;
- an A/D converter that performs an A/D conversion process on a signal amplified by the amplifier circuit;
- first to Nth D/A converters that are provided corresponding to the first to Nth amplifiers and used to perform an offset adjustment of the first to Nth amplifiers;
- and
- a control circuit that sets an offset adjustment of the first to Nth amplifiers using the first to Nth D/A converters and sets a gain adjustment of the first to Nth amplifiers.
3 The integrated circuit device as defined in claim 2,
- when a gain of an ith amplifier among the first to Nth amplifiers is referred to as G1 and a 1 LSB-equivalent voltage of the ith D/A converter is referred to as VLSB1, QR2≧G1×VLSB1 being satisfied.
Dependencies are inferred from the claim text.