Non-resistive load driver
First Claim
1. A device, comprising:
- a voltage generator configured to generate an input voltage;
a first circuit configured to drive a non-resistive load to a threshold voltage level, the first circuit comprising;
a first comparator configured to compare a non-resistive load voltage to a first voltage;
a first switch configured to charge the non-resistive load when the first voltage is greater than the non-resistive load voltage;
a second comparator configured to compare the non-resistive load voltage to a second voltage, anda second switch configured to discharge the non-resistive load when the non-resistive load voltage is greater than the second voltage; and
a second circuit configured to adjust the non-resistive load voltage to approximate the input voltage.
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0 Petitions
Accused Products
Abstract
Embodiments of the invention relate to a method and apparatus to drive non-resistive loads. The non-resistive load driver may include two or more drivers, such as a high-drive circuit and a low-drive circuit, to drive rail-to-rail output voltages and to stabilize the output voltages at a substantially constant level. The high-drive circuit may drive the output voltage of the non-resistive load driver to a threshold level, whereas the low-drive circuit may modify the output voltage of the non-resistive load driver to approximate an input voltage of the non-resistive load driver, and compensate any leakage associated with the non-resistive loads to provide a substantially constant output voltage. The low-drive circuit consumes less current than the high-drive circuit. The non-resistive load driver consumes less power and use less chip space. Alternatively, the non-resistive load driver may be implemented using a single driver with multiple modes, such as a low-drive mode and a high-drive mode, by changing a bias current of the non-resistive load driver between a high current mode and a low current mode.
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Citations
20 Claims
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1. A device, comprising:
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a voltage generator configured to generate an input voltage; a first circuit configured to drive a non-resistive load to a threshold voltage level, the first circuit comprising; a first comparator configured to compare a non-resistive load voltage to a first voltage; a first switch configured to charge the non-resistive load when the first voltage is greater than the non-resistive load voltage; a second comparator configured to compare the non-resistive load voltage to a second voltage, and a second switch configured to discharge the non-resistive load when the non-resistive load voltage is greater than the second voltage; and a second circuit configured to adjust the non-resistive load voltage to approximate the input voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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generating an input voltage; driving a non-resistive load to a voltage within a voltage window, the voltage window being defined by the input voltage and an offset voltage during a high-drive mode; adjusting a non-resistive load voltage to approximate the input voltage during a low-drive mode; and compensating the non-resistive load voltage for leakage during the low-drive mode. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A non-resistive load driver, comprising:
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a voltage generator configured to generate an input voltage; a high drive circuit configured to drive a non-resistive load to a voltage within a voltage range, the voltage range being defined by the input voltage and an offset voltage; a low drive circuit configured to adjust a non-resistive load voltage to approximate the input voltage by canceling any offset voltages associated with the non-resistive load voltage; and a control signal generator configured to generate one or more control signals to select at least one of the high-drive circuit or the low-drive circuit. - View Dependent Claims (19, 20)
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Specification