The System-on-a-Programmable-Chip can be used to program the system on chip. Programmatic logic is used to place the entire system on a piece of silicon called SOPC. Programmable System-on-Chip (SOPC) is a flexible, efficient SOC solution from Alter-a. It integrates the functional blocks required for system design such as processor, memory, I/O port, LVDS, CDR, etc. into a programmable device to form a programmable system-on-chip.
SOPC combines the advantages of SOC and PLD and FPGA. It generally has the following basic features: at least one embedded processor core; low-capacity on-chip high-speed RAM resources; rich IP Core resources to choose from; sufficient on-chip programmable Logic resources; processor debug interface and FPGA programming interface; including partially programmable analog circuits; single-chip, low-power, micro-package.
SOPC is the result of the convergence of PLD and ASIC technology. At present, the 0. 13 micron ASIC product is still quite expensive to manufacture. On the contrary, the SOPC chip integrates hard or soft core CPU, DSP, memory, peripheral I/O and programmable logic. There is a great advantage in the flexibility and price of the application. SOPC is called "the future of the semiconductor industry" and has a good development prospect.
Based on people's constant attention to health, people who use their home portable electronic blood pressure monitors to pay attention to their health status are also increasing year by year. At present, most electronic blood pressure monitors on the domestic market are designed based on single-chip microcomputers or ARM series chips. Comparing these two designs, the portable electronic blood pressure monitor based on SOPC embedded system is more integrated and lighter, and has higher stability and precision than the electronic blood pressure meter based on single chip microcomputer, and is designed according to the electronic blood pressure meter based on ARM series chip. It is more convenient, the design cycle is shorter, and the cost price is more advantageous.
1 The general method of measuring blood pressure by electronic blood pressure meter
The first commercial wave method blood pressure monitor was designed by a US company in 1973 and put on the market in 1976, named Dinamap (indirect non-invasive mean arterial pressure measuring device). The first Dinamap-825 was only able to measure mean blood pressure, and later developed into the Model 845, which measures systolic blood pressure (SBP), diastolic blood pressure (DBP), mean pressure (MAP), and pulse rate.
1.1 The principle of the electronic blood pressure meter commonly used to measure the blood pressure oscillation method
The principle of oscillation is based on the relative relationship between arterial pressure and the envelope of gas oscillations in the cuff. Figure 1 is a graphical representation of the oscillation amplitude and cuff pressure in a cardiac cycle. As can be seen in Figure 1, when the cuff pressure (static pressure) is greater than the systolic pressure (SP) (generally greater than 20-30 mmHg), the artery is compressed, and at this time, a small oscillation wave appears due to the impact of the proximal pulse. When the static pressure is close to SP, the amplitude increases; when the static pressure is equal to the average pressure (MP), the artery is in the unloaded state, the amplitude reaches the maximum value, and when the static pressure is less than MP, the amplitude gradually decreases; the static pressure is less than the diastolic pressure ( After DP), the arterial lumen is fully dilated during diastole and the lumen stiffness is increased, at which time the amplitude is maintained at a low level. The oscillating waves recorded during deflation exhibit an approximation of the parabola. Obviously, the static pressure value corresponding to the envelope trace indirectly reflects the arterial blood pressure. The problem is how to find the relationship between the envelope and blood pressure in an accurate, effective and concise way.
Figure 1 Graphical relationship between oscillation amplitude and cuff pressure
Fig.1 The Illustrative relation between oscillometric amplitude and the cuff pressure
It should be noted that the average pressure here is not the usual estimation formula: MP = (2DP + SP) / 3, which is the integral of the arterial blood pressure waveform in one week divided by the period. The mean pressure is the perfusion pressure that the heart gives to the arterial blood throughout the heartbeat. Researchers have shown that the maximum value of the blood pressure oscillation signal has a good correspondence with the average pressure, so the maximum amplitude is often used to determine the average blood pressure value.
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