Output switching circuit
First Claim
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1. An output switching circuit, comprising:
- a switching circuit having a first transistor connected to a high-voltage power supply, a second transistor connected to a low-voltage power supply, and an output terminal at a connection node between the first and second transistors;
a comparator configured to compare an input signal with a feedback signal obtained by feedback of an output signal of the output terminal via a low-pass filter;
a sampling circuit configured to sample an output of the comparator based on a reference clock to generate a sampling signal having a first or a second level;
a comparison signal generating circuit configured to generate a comparison signal having the first level when the sampling signal is at the first level for a longer duration in time over a period of the comparison signal than the second level or having the second level when the sampling signal is at the first level for a shorter duration in time over the period of the comparison signal than the second level; and
a drive pulse generating unit configured to generate a first drive pulse to drive the first transistor and a second drive pulse to drive the second transistor in accordance with the comparison signal.
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Abstract
An output switching circuit includes a switching circuit having a first transistor connected to a high-voltage power supply, a second transistor connected to a low-voltage power supply, and an output terminal at a connection node between the first and second transistors; a comparison unit that compares an input signal with a feedback signal obtained by feedback of an output signal of the output terminal via a low-pass filter to generate a comparison signal; and a drive pulse generating unit that generates first drive pulses for driving the first transistor and second drive pulses for driving the second transistor in accordance with the comparison signal.
23 Citations
19 Claims
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1. An output switching circuit, comprising:
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a switching circuit having a first transistor connected to a high-voltage power supply, a second transistor connected to a low-voltage power supply, and an output terminal at a connection node between the first and second transistors; a comparator configured to compare an input signal with a feedback signal obtained by feedback of an output signal of the output terminal via a low-pass filter; a sampling circuit configured to sample an output of the comparator based on a reference clock to generate a sampling signal having a first or a second level; a comparison signal generating circuit configured to generate a comparison signal having the first level when the sampling signal is at the first level for a longer duration in time over a period of the comparison signal than the second level or having the second level when the sampling signal is at the first level for a shorter duration in time over the period of the comparison signal than the second level; and a drive pulse generating unit configured to generate a first drive pulse to drive the first transistor and a second drive pulse to drive the second transistor in accordance with the comparison signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An output switching circuit, comprising:
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a switching circuit having a first transistor connected to a high-voltage power supply, a second transistor connected to a low-voltage power supply, and an output terminal at a connection node between the first and second transistors; a comparison unit configured; to sample an analog signal according to a sampling signal, the sampling signal having a first level and a second level, and to generate a comparison signal having the first level when the sampling signal is at the first level for a longer duration in time over a period of the comparison signal than the second level or having the second level when the sampling signal is at the first level for a shorter duration in time over the period of the comparison signal than the second level; and a drive pulse generating unit configured to generate a first drive pulse to drive the first transistor and a second drive pulse to drive the second transistor in accordance with the comparison signal. - View Dependent Claims (17, 18, 19)
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Specification