A Demodulation Circuit of Amplitude Shift Keying Based on Sampling Subtraction Method
A technology of amplitude shift keying and demodulation circuit, applied in the direction of amplitude modulation carrier system, etc., can solve the problem of increasing power consumption, and achieve the effect of controlling power consumption
Active Publication Date: 2022-06-17
四川省博瑞恩科技有限公司
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Problems solved by technology
However, due to the close proximity of PCI and data carrier frequency bands, high-order filters are required to filter out PCI, which greatly increases power consumption
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Embodiment 1
[0031] This embodiment implements an amplitude shift keying demodulation circuit based on the sampling subtraction method.
[0032] figure 2 It is a schematic diagram of the overall framework of the amplitude shift keying demodulation circuit based on the sampling subtraction method. as attached figure 2 As shown, an amplitude shift keying demodulation circuit based on the sampling-subtraction method in this embodiment includes: an envelope detection circuit 1 , a sampling-subtraction module 2 , a comparator module 3 and a finite state machine module 4 .
[0033] image 3 It is a schematic diagram of the envelope detector of the amplitude shift keying demodulation circuit based on the sampling subtraction method. as attached image 3 As shown in the present embodiment, an amplitude shift keying demodulation circuit based on the sampling subtraction method. The envelope detection circuit 1 consists of a source follower 11, a differential operational amplifier 12, a 1:X cu...
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The present invention relates to an amplitude shift keying demodulation circuit based on a sampling subtraction method. The amplitude shift keying demodulation circuit includes an envelope detection circuit for extracting the envelope of an input signal, a sampling phase for eliminating energy carrier interference Subtraction module, a comparator module and a finite state machine module for obtaining output data; the amplitude shift keying modulation signal Vin inputted by the energy carrier interference is input to the above-mentioned envelope detection circuit to extract the envelope signal, and the same frequency as the energy carrier interference frequency is used. The sampling signal is sampled by the above-mentioned sampling subtraction module to the above-mentioned envelope signal and made difference before and after, so as to eliminate the energy carrier interference and obtain the ASK data change signal; the ASK data change signal output by the above-mentioned sample subtraction module passes through the above-mentioned The comparator module and the finite state machine module obtain the amplitude shift keying data Dout. The beneficial effect is that the PCI and control circuit power consumption can be effectively eliminated.
Description
【Technical field】 [0001] The invention relates to the technical field of analog integrated circuits, in particular to an amplitude shift keying demodulation circuit based on a sampling subtraction method. 【Background technique】 [0002] Among blind patients, Age-related Macular Degeneration (AMD) and Retinitis Pigmentosa (RP) are one of the common causes of blindness. Both types of patients are blind due to retinal degeneration, but most of the nerve cells in the eye remain intact. With the rapid development of biomedical implantable integrated circuits in recent years, it has become possible to restore patients' vision using implantable retinal prostheses. To power implantable devices and communicate with external coils, wireless energy and data telemetry, especially dual-frequency telemetry links with different frequencies (1MHz for energy and 13.56MHz for data) have been widely used in most retinal prostheses use. Amplitude shift keying (ASK for short) has become one o...
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IPC IPC(8): H04L27/06
CPCH04L27/06
Inventor 陈铭易陈逸飞
Owner 四川省博瑞恩科技有限公司