Analog-to-digital conversion circuit and current measurement circuit
AssigneeNuvoton Technology Corporation Japan
InventorHitoshi Kobayashi
Life of this patent
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Abstract
An analog-to-digital conversion circuit includes: a first variable gain amplifier connected to an input terminal; a first AD converter connected to the first variable gain amplifier; a second variable gain amplifier connected to the input terminal; a second AD converter connected to the second variable gain amplifier; a selection circuit to which an output of the first AD converter and an output of the second AD converter are input, and which selects one of the outputs; and a control circuit that controls a gain change period of the first variable gain amplifier and a gain change period of the second variable gain amplifier in a relative manner.
Claims19
An analog-to-digital conversion circuit comprising:
- a first variable gain amplifier connected to an input terminal;
- a first AD converter connected to the first variable gain amplifier;
- a second variable gain amplifier connected to the input terminal;
- a second AD converter connected to the second variable gain amplifier;
- a selection circuit to which an output of the first AD converter and an output of the second AD converter are input;
- a control circuit that controls a gain change period of the first variable gain amplifier and a gain change period of the second variable gain amplifier in a relative manner;
- and
- a divider.
An analog-to-digital conversion circuit comprising:
- a first variable gain amplifier connected to an input terminal;
- a first AD converter connected to the first variable gain amplifier;
- a second variable gain amplifier connected to the input terminal;
- a second AD converter connected to the second variable gain amplifier;
- a selection circuit to which an output of the first AD converter and an output of the second AD converter are input;
- a control circuit that controls a gain change period of the first variable gain amplifier and a gain change period of the second variable gain amplifier in a relative manner;
- a first divider that divides the output of the first AD converter by a value indicating gain of the first variable gain amplifier to obtain a quotient, and outputs the quotient to the selection circuit;
- and
- a second divider that divides the output of the second AD converter by a value indicating gain of the second variable gain amplifier to obtain a quotient, and outputs the quotient to the selection circuit.
An analog-to-digital conversion circuit comprising:
- a first variable gain amplifier connected to an input terminal;
- a first AD converter connected to the first variable gain amplifier;
- a second variable gain amplifier connected to the input terminal;
- a second AD converter connected to the second variable gain amplifier;
- a selection circuit to which an output of the first AD converter and an output of the second AD converter are input;
- a control circuit that controls a gain change period of the first variable gain amplifier and a gain change period of the second variable gain amplifier in a relative manner;
- and
- an automatic gain control (AGC) circuit that generates a first instruction signal and a second instruction signal, the first instruction signal instructing an increase or decrease of gain according to a magnitude of the output of the first AD converter, the second instruction signal instructing an increase or decrease of gain according to a magnitude of the output of the second AD converter, wherein
- the control circuit controls a gain change of the first variable gain amplifier and a gain change of the second variable gain amplifier, according to the first instruction signal and the second instruction signal.
Dependencies are inferred from the claim text.