US 7,609,783 B2Granted

Amplitude shift keying (ASK) demodulation circuit based on a self sample as a basis application in an organism implantation microsystem

AssigneeNational Central University

InventorsCihun-Siyong (Alex) Gong, Muh-Tian Shiue, Chang Yin, Su Chun-Hsien

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Abstract

An amplitude shift keying (ASK) demodulation circuit based on a self sample as a basis application in an organism implantation microsystem is a low-cost and high-performance ASK demodulation core, comprising a pulse shaper, a voltage scaler, a level contrastor, and a self-sampler for achievement of the demodulation core provided pretty digital features, and needs no passive resistor and capacitor, which may reduce the cost of design and prevent the problem with precision. Further, in the aspect of active point, the size of a transistor may be adjusted for variable control, and hence levels determined among modulation signals may be reduced to lower the complexity of voltage regulator in design.

Claims5

Dependent claims

An Amplitude Shift Keying (ASK) demodulation circuit based on a self sample as a basis application in an organism implantation microsystem, comprising:

a pulse shaper provided with a Schmitt trigger that generates a pair of sharpening clock-pulse signal required for the operation of a subsequent self-sampler;
a voltage scaler that reversely raises an inputted modulation signal, in which the signal levels are higher than a lowest reference level (GND), and separates the variation among different sets of amplitude modulation in the modulation signal for a next stage of advanced processing;
a level contrastor that further separates a signal outputted by the voltage scaler;
and
a self-sampler that samples the output of level contrastor by the clock-pulse signal generated from the pulse shaper, in which the sampled result is a demodulation output.

2 more elements

Dependencies are inferred from the claim text.