Amplitude shift keying demodulator and method for demodulating an ask signal
AssigneeBeken Corporation
InventorsJiazhou Liu, Dawei Guo, Yangeng Wang
Life of this patent
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Abstract
An ASK demodulator comprises a rectification circuit which receives and rectifies an ASK signal to generate a rectified current; an active load circuit is coupled to the rectification circuit and receives the rectified current and present an impedance which is inversely proportional to at least a part of the rectified current when a frequency of a base band signal meets a preset condition; a comparator is coupled to the rectification circuit and the active load circuit and receives a reference voltage and a voltage generated based on, at least in part, the rectified current and the impedance, and compares the reference voltage and the generated voltage to generate a demodulated signal.
Claims12
An ASK demodulator, comprising:
- a rectification circuit configured to receive and rectify an ASK signal to generate a rectified current;
- an active load circuit coupled to the rectification circuit and configured to receive the rectified current and present an impedance which is inversely proportional to at least a part of the rectified current when a frequency of a base band signal meets a preset condition;
- a comparator coupled to the rectification circuit and the active load circuit and configured to receive a reference voltage and a voltage generated based on, at least in part, the rectified current and the impedance, and compare the reference voltage and the generated voltage to generate a demodulated signal.
A method for demodulating an ASK signal, comprising:
- receiving and rectifying an ASK signal by a rectification circuit to generate a rectified current;
- receiving the rectified current and presenting an impedance which is inversely proportional to at least a part of the rectified current by an active load circuit when a frequency of a base band signal meets a preset condition;
- comparing a reference voltage with a voltage generated based on, at least in part, the rectified current and the impedance to generate a demodulated signal.
Dependencies are inferred from the claim text.