SIGNAL AMPLIFICATION DEVICE
First Claim
1. A signal amplification device for amplifying an input signal by automatically setting a threshold level, comprising:
- an offset voltage generator for detecting a direct-current level of the input signal, and generating and outputting a positive offset voltage signal or a negative offset voltage signal;
a threshold controller including a peak detector for outputting the positive offset voltage signal as a peak value if a level of the positive offset voltage signal is higher than a maximum level of the input signal, and outputting the maximum level of the input signal as the peak value if the maximum level of the input signal is higher than the level of the positive offset voltage signal, a bottom detector for outputting the negative offset voltage signal as a bottom value if a level of the negative offset voltage signal is lower than a minimum level of the input signal, and outputting the minimum level of the input signal as the bottom value if the minimum level of the input signal is lower than the level of the negative offset voltage signal, and a voltage divider for subjecting the peak value output from the peak detector and the bottom value output from the bottom detector to voltage division, to generate the threshold level; and
an amplifier for amplifying a differential between the input signal and the threshold level output from the voltage divider.
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Accused Products
Abstract
A signal amplification device which uses inexpensive standard CMOS and yet is capable of high-accuracy threshold setting. An offset voltage generator detects the direct-current level of an input signal, and generates a positive or negative offset voltage signal. A peak detector outputs, as a peak value, the positive offset voltage signal if the level thereof is higher than the maximum level of the input signal, or the maximum level of the input signal if the maximum level is higher than the positive offset voltage signal. A bottom detector outputs, as a bottom value, the negative offset voltage signal if the level thereof is lower than the minimum level of the input signal, or the minimum level of the input signal if the minimum level is lower than the negative offset voltage signal. A voltage divider subjects the peak and bottom values to voltage division, to generate a threshold level.
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Citations
21 Claims
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1. A signal amplification device for amplifying an input signal by automatically setting a threshold level, comprising:
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an offset voltage generator for detecting a direct-current level of the input signal, and generating and outputting a positive offset voltage signal or a negative offset voltage signal; a threshold controller including a peak detector for outputting the positive offset voltage signal as a peak value if a level of the positive offset voltage signal is higher than a maximum level of the input signal, and outputting the maximum level of the input signal as the peak value if the maximum level of the input signal is higher than the level of the positive offset voltage signal, a bottom detector for outputting the negative offset voltage signal as a bottom value if a level of the negative offset voltage signal is lower than a minimum level of the input signal, and outputting the minimum level of the input signal as the bottom value if the minimum level of the input signal is lower than the level of the negative offset voltage signal, and a voltage divider for subjecting the peak value output from the peak detector and the bottom value output from the bottom detector to voltage division, to generate the threshold level; and an amplifier for amplifying a differential between the input signal and the threshold level output from the voltage divider. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 20, 21)
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10. A signal amplification device for amplifying an input signal by automatically setting a threshold level, comprising:
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an offset voltage generator for detecting a direct-current level of the input signal that varies on a positive side, and generating and outputting a positive offset voltage signal; a threshold controller including a peak detector for outputting the positive offset voltage signal as a peak value if a level of the positive offset voltage signal is higher than a maximum level of the input signal, and outputting the maximum level of the input signal as the peak value if the maximum level of the input signal is higher than the level of the positive offset voltage signal, a bottom detector for outputting a minimum level of the input signal as a bottom value, a negative offset voltage adder for adding a preset negative offset to the bottom value to generate a negative bottom shift value, and a voltage divider for subjecting the peak value output from the peak detector and the negative bottom shift value output from the negative offset voltage adder to voltage division, to generate the threshold level; and an amplifier for amplifying a differential between the input signal and the threshold level output from the voltage divider. - View Dependent Claims (12, 14, 16, 18)
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11. A signal amplification device for amplifying an input signal by automatically setting a threshold level, comprising:
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an offset voltage generator for detecting a direct-current level of the input signal that varies on a negative side, and generating and outputting a negative offset voltage signal; a threshold controller including a bottom detector for outputting the negative offset voltage signal as a bottom value if a level of the negative offset voltage signal is lower than a minimum level of the input signal, and outputting the minimum level of the input signal as the bottom value if the minimum level of the input signal is lower than the level of the negative offset voltage signal, a peak detector for outputting a maximum level of the input signal as a peak value, a positive offset voltage adder for adding a preset positive offset to the peak value to generate a positive peak shift value, and a voltage divider for subjecting the bottom value output from the bottom detector and the positive peak shift value output from the positive offset voltage adder to voltage division, to generate the threshold level; and an amplifier for amplifying a differential between the input signal and the threshold level output from the voltage divider. - View Dependent Claims (13, 15, 17, 19)
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Specification