Digital-to-Analog Converter
First Claim
1. A digital-to-analog converter comprising:
- a resistor having a resistance R;
a capacitor having a capacitance C;
a first switching element configured, in response to a first control signal, to couple the capacitor to a first rail via a path having a resistance less than R;
a second switching element configured, in response to a second control signal, to couple the capacitor to the first voltage rail through the resistor;
a third switching element configured, in response to a third control signal, to couple the capacitor to a second rail via a path having a resistance less than R, anda fourth switching element configured, in response to a fourth control signal, to couple the capacitor to the second rail through the resistor.
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Accused Products
Abstract
A digital-to-analog converter (DAC) is described. The DAC comprises a resistor having a resistance R and a capacitor having a capacitance C. The DAC comprises a first switching element configured, in response to a first control signal, to couple the capacitor to a first rail via a path having a resistance less than R and a second switching element configured, in response to a second control signal, to couple the capacitor to the first rail through the resistor. The DAC also comprises a third switching element configured, in response to a third control signal, to couple the capacitor to a second rail (8) via a path having a resistance less than R and a fourth switching element configured, in response to a responsive to a fourth control signal, to couple the capacitor to the second through the resistor. The capacitor can be quickly charged or discharged over a period less than RC or less than 0.7 RC. The DAC may comprise a first control element configured to switch on the second switching element before switching on the first switching element and a second control element configured to switch on the fourth switching element before switching on the third switching element.
3 Citations
25 Claims
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1. A digital-to-analog converter comprising:
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a resistor having a resistance R; a capacitor having a capacitance C; a first switching element configured, in response to a first control signal, to couple the capacitor to a first rail via a path having a resistance less than R; a second switching element configured, in response to a second control signal, to couple the capacitor to the first voltage rail through the resistor; a third switching element configured, in response to a third control signal, to couple the capacitor to a second rail via a path having a resistance less than R, and a fourth switching element configured, in response to a fourth control signal, to couple the capacitor to the second rail through the resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of controlling a digital-to-analog converter comprising a resistor having a resistance R, a capacitor having a capacitance C and at least one switching element (Q1, Q2, Q3, Q4) configured, in response to a control signal, to couple the capacitor to a voltage rail through the resistor, the method comprising:
applying the control signal for a duration less than RC. - View Dependent Claims (24, 25)
Specification