Demodulator
First Claim
1. A demodulator for demodulating a modulated signal, the demodulator comprising a peak detector, the peak detector comprising:
- a peak detector input coupled to receive the modulated signal and a peak detector output to supply a peak detector output signal;
a charge storer coupled to the peak detector output so that the peak detector output signal is provided by a voltage across the charge store;
a comparator having first and second comparator inputs and a comparator output, the first comparator input being coupled to the peak detector input to receive the modulated signal and the second comparator input being coupled to the peak detector output to receive the peak detector output signal and the comparator being operable to provide a comparison signal representing a comparison between the voltage of the modulated signal and the peak detector output signal; and
a charging controller operable to charge the charge storer so as to increase the output voltage when the comparator provides a first signal indicating that the voltage of the modulated signal is higher than the voltage of the peak detector output signal and to discharge the charge storer so as to decrease the output voltage when the comparator provides a second signal indicating that the voltage of the modulated signal is lower than the voltage of the peak detector output signal.
4 Assignments
0 Petitions
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.
-
Citations
18 Claims
-
1. A demodulator for demodulating a modulated signal, the demodulator comprising a peak detector, the peak detector comprising:
-
a peak detector input coupled to receive the modulated signal and a peak detector output to supply a peak detector output signal; a charge storer coupled to the peak detector output so that the peak detector output signal is provided by a voltage across the charge store; a comparator having first and second comparator inputs and a comparator output, the first comparator input being coupled to the peak detector input to receive the modulated signal and the second comparator input being coupled to the peak detector output to receive the peak detector output signal and the comparator being operable to provide a comparison signal representing a comparison between the voltage of the modulated signal and the peak detector output signal; and a charging controller operable to charge the charge storer so as to increase the output voltage when the comparator provides a first signal indicating that the voltage of the modulated signal is higher than the voltage of the peak detector output signal and to discharge the charge storer so as to decrease the output voltage when the comparator provides a second signal indicating that the voltage of the modulated signal is lower than the voltage of the peak detector output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A demodulator for demodulating a modulated signal, the demodulator comprising peak detecting means, the peak detecting means comprising:
-
a peak detector input for receiving the modulated signal and a peak detector output for supplying a peak detector output signal; charge storing means coupled to the peak detector output so that the peak detector output signal is provided by a voltage across the charge storing means; comparator means having first and second inputs and an output, the first comparator input being coupled to the peak detector input to receive the modulated signal and the second comparator input being coupled to the peak detector output to receive the peak detector output signal, the comparator means being for providing a comparison signal representing a comparison between the voltage of the modulated signal and the peak detector output signal; and a charging control means for charging the charge storing means so as to increase the output voltage when the comparator means provides a first signal indicating that the voltage of the modulated signal is higher than the voltage of the peak detector output signal and for discharging the charge storing means so as to decrease the output voltage when the comparator means provides a second signal indicating that the voltage of the modulated signal is lower than the voltage of the peak detector output signal.
-
Specification