Peak detector for detecting peaks in a modulated signal
First Claim
1. A peak detector for detecting peaks in a modulated signal, comprising:
- a charge storer configured to provide a peak detector output signal, the peak detector output signal indicative of the peaks in the modulated signal;
a comparator configured to compare the modulated signal and the peak detector output signal to provide a comparison signal, the comparison signal being a first voltage level indicating that the modulated signal is greater than the peak detector output signal or a second voltage level indicating that the modulated signal is less than the peak detector output signal; and
a charging controller configured to continuously provide a first current to the charge storer so as to decrease the peak detector output signal and to provide a second current to the charge storer when the comparison signal is at the first voltage level, the second current being greater than the first current such that a combination of the first current and the second current is able to charge the charge storer.
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Accused Products
Abstract
A demodulator for demodulating a modulated signal has a peak detector (206) with an input (100) coupled to receive the modulated signal and an output (207) to supply a peak detector output signal. The peak detector has a charge storer (314) coupled to the peak detector output so that the peak detector output signal is provided by a voltage across the charge storer (314) and a comparator (313) having a first comparator input coupled to the peak detector input to receive the modulated signal and a second comparator input coupled to the peak detector output to receive the peak detector output signal. The comparator (313) provides a comparison signal representing a comparison between the voltage of the modulated signal and the peak detector output signal. A charging controller (315, 316 and 318) charges the charge storer (314) so as to increase the output voltage when the comparator (313) provides a first signal indicating that the voltage of the modulated signal is higher than the voltage of the peak detector output signal and discharges the charge storer (314) so as to decrease the output voltage when the comparator (313) provides a second signal indicating that the voltage of the modulated signal is lower than the voltage of the peak detector output signal.
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Citations
18 Claims
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1. A peak detector for detecting peaks in a modulated signal, comprising:
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a charge storer configured to provide a peak detector output signal, the peak detector output signal indicative of the peaks in the modulated signal; a comparator configured to compare the modulated signal and the peak detector output signal to provide a comparison signal, the comparison signal being a first voltage level indicating that the modulated signal is greater than the peak detector output signal or a second voltage level indicating that the modulated signal is less than the peak detector output signal; and a charging controller configured to continuously provide a first current to the charge storer so as to decrease the peak detector output signal and to provide a second current to the charge storer when the comparison signal is at the first voltage level, the second current being greater than the first current such that a combination of the first current and the second current is able to charge the charge storer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A peak detector for detecting peaks in a modulated signal, comprising:
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means for storing a peak detector output signal, the peak detector output signal indicative of the peaks in the modulated signal; means for comparing the modulated signal and the peak detector output signal to provide a comparison signal, the comparison signal being a first voltage level indicating that the modulated signal is greater than the peak detector output signal or a second voltage level indicating that the modulated signal is less than the peak detector output signal; and means for controlling the peak detector output signal by continuously providing a first current to the means for storing so as to decrease the peak detector output signal and by providing a second current to the means for storing when the comparison signal is at the first voltage level, the charging of the means for storing the peak detector output signal being greater than the discharging of the means for storing the peak detector output signal. - View Dependent Claims (12)
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13. A peak detector, comprising:
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a charge storer configured to provide a peak detector output signal; a comparator configured to compare a modulated signal and the peak detector output signal to provide a comparison signal, the comparison signal being a first voltage level indicating that the modulated signal is greater than the peak detector output signal or a second voltage level indicating that the modulated signal is less than the peak detector output signal, the first voltage level being greater than the second voltage level; a timer configured to output a replacement signal being a third voltage level upon expiration of a pre-determined time period which has elapsed since the comparison signal was at the first voltage level; and a charging controller configured to charge the charge storer so as to increase the peak detector output signal when the comparison signal is at the first voltage level or the replacement signal is at the third voltage level, and to discharge the charge storer so as to decrease the peak detector output signal when the comparison signal is at the second voltage level. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification