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US 2006/0139196 A1Published application
Switched capacitor circuit type digital/analog converter capable of suppressing change of setting error
AssigneeNEC Electronics Corporation
InventorKoji Yoichi
Life of this patent
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Abstract
In a digital/analog converter of a switched capacitor circuit type including at least one capacitor, at least one power supply terminal, and at least one output terminal, a switch circuit is adapted to carry out a charging operation upon the capacitor so that a charge is stored in the capacitor and then carry out a discharging operation upon the capacitor to discharge'the charge to one of the power supply terminal and the output terminal in accordance with a digital input data signal.
Claims19
A digital/analog converter of a switched capacitor circuit type, comprising:
- at least one capacitor;
- at least one power supply terminal;
- at least one output terminal;
- a switch circuit adapted to carry out a charging operation upon said capacitor so that a charge is stored in said capacitor and then carry out a discharging operation upon said capacitor to discharge said charge to one of said power supply terminal and said output terminal in accordance with a digital input data signal.
1 more element
A digital/analog converter of a switched capacitor circuit type, comprising:
- a first power supply terminal adapted to receive a first power supply voltage;
- a second power supply terminal adapted to receive a second power supply voltage lower than said first power supply voltage;
- a third power supply'terminal adapted to receive a third power supply voltage lower than said second power supply voltage;
- first and second output terminals;
- a first capacitor having first and second terminals;
- a second capacitor having third and fourth terminals;
- a first switch circuit adapted to connect the first terminal of said first capacitor to said first power supply terminal in response to a first clock signal and to said second power supply terminal in response to a clock signal;
- a second switch circuit adapted to connect the third terminal of said second capacitor to said third power supply terminal in response to said first clock signal and to said second power supply terminal in response to said second clock signal;
- a third switch circuit adapted to connect the second terminal of said first capacitor to said second power supply terminal in response to said first clock signal, to said first output terminal in response to said second clock signal when a digital input signal indicates a first value, to said second power supply terminal in response to said second clock signal when said digital input signal indicates a second value, and to said second power supply terminal in response to said. second clock signal when said digital input signal indicates a third value;
- and
- a fourth switch circuit adapted to connect the fourth terminal of said second capacitor to said second power supply terminal in response to said first clock signal, to said second output terminal in response to said second clock signal when said digital input signal indicates said first value, to said second first output terminal in response to said second clock signal when said digital input signal indicates said second value, and to said second power supply terminal when said digital input signal indicates said third value.
8 more elements
A digital/analog converter of a switched capacitor circuit type, comprising:
- a first power supply terminal adapted to receive a first power supply voltage;
- a second power supply terminal adapted to receive a second power supply voltage lower than said first power supply voltage;
- a third power supply terminal adapted to receive a third power supply voltage lower than said second power supply voltage;
- an output terminal;
- a capacitor having first and second terminals;
- a first switch circuit adapted to connect the first terminal of said capacitor to said first power supply terminal in response to a first clock signal when a digital input signal indicates a first value, to said third power supply terminal in response to said first clock signal when said digital input signal indicates a second value, and to said second power supply terminal in response to a second clock signal;
- and
- a second switch circuit adapted to connect the second terminal of said capacitor to said second power supply terminal in response to said first clock signal, to said output terminal in response to said second clock signal when said digital input signal indicates a third value, and to said second power supply terminal in response to said second clock signal when said digital input signal indicates a fourth value.
5 more elements
A digital/analog converter comprising:
- a first power supply terminal adapted to receive a first power supply voltage;
- a second power supply terminal adapted to receive a second power supply voltage lower than said first power supply voltage;
- an output terminal;
- a first switch circuit adapted to connect the first terminal of said capacitor to said first power supply terminal in response to a first clock signal, to said second power supply terminal in response to a second clock signal when a digital input signal indicates a first value, to said output terminal in response to said second clock signal when said digital input signal indicates a second value, and to said second power supply terminal in response to said second clock signal when said digital input signal indicates a third value;
- and
- a second switch circuit adapted to connect the second terminal of said capacitor to said second power supply terminal in response to said first clock signal, to said output terminal in response to said second clock signal when said digital input signal indicates a first value, and to said second power supply terminal in response to said second clock signal when said digital input signal indicates said second value or a third value.
3 more elements
Dependencies are inferred from the claim text.