Low power consumption voltage resistance testing of IC design portable infusion pump

Portable infusion pump is an important characteristic is the length of battery life, low-power components and power saving are expected by the system.

This article describes how to select the appropriate device to design a used battery-powered portable infusion pump.

In medical applications, infusion pump infusion to patients with circulatory system.

Enter the dose should be as low as 100 μ L. By measuring the liquid pressure can be controlled for infusion rate. Portable infusion pump is an important characteristic is the length of battery life, low-power components and power saving are expected by the system.

Solution

Piezoresistive sensors located n p substrates or substrate in a simple double exposure zones p diffused n wells or trap.

Famous Wheatstone bridge is the use of Varistors advanced pressure sensor. This structure can measure bridge circuit two arm balance of unknown resistance, one arm including unknown elements. Excitation voltage or current incentive was imposed on the bridge. Applied to the piezoelectric pressure can change the resistance, the resulting voltage changes.

Analog devices introduces the AD627 is a micropower instrumentation amplifier, the provision of integrated rail-to-rail output swing, using single or dual power supply (+ 2.2V to ± 18V) power supply.

It can measure differential voltage, maximum operating current of only 85 A μ. It is ideal for portable infusion pump, allows a longer battery life. AD627 with low offset voltage, low offset drift and low gain error, so that errors are minimized. In the reference pin AD627 impose low impedance voltage source can change the output voltage. Output signal to the input pin voltage and REF pins of the applied voltage voltage difference. ADR36x series micro-power, high precision bandgap voltage reference with patented temperature drift curvature correction technology, use the minimum power supply voltage (300mV) output provides stable output voltage. Its advanced design, does not require an external capacitor, can further reduce board space and reduced system cost, very suitable for battery-powered devices.