Abstract: A phase shift detector comprises a comparator for detecting phase information of a signal and an offset calibration circuit. In order to prevent input offset voltage of the comparator from affecting phase detection accuracy, bulk voltage is inputted to the comparator from the offset calibration circuit to adjust threshold voltage of transistor in the comparator for compensating input offset voltage of the comparator and improving accuracy of the phase shift detector.

Abstract: A healthful patch includes an airy cloth and a layer of silicon gel mixed with far-infrared energy powder coated on a lower surface of the airy cloth. The layer of the silicon gel is provided with many tiny air holes. The healthful patch can be covered on an aching or sore spot or section of a human body to let the far-infrared energy functioning to give medicating effect to the aching or sore spot or section for reinforcing blood circulation and metabolism, relieving aching or sore, getting rid of fatigues, activating cells, and giving healthful effect to human bodies.

Abstract: A healthful belt includes an elastic cloth and a silica gel layer deposited on an inner surface of the elastic cloth. The silica gel layer is provided with plural air holes and far-infrared energy. Then the healthful belt is worn on a sore or painful section of a body, letting the far-infrared energy in the silica gel layer sink in the skin organization and the joint for functioning to give medicating effect to the sore and the pain, to reinforce blood circulation and metabolism, to relieve aching or sore, to get rid of fatigues, to activate metabolism, and helpful to the health of human bodies. In addition, a person may feel comfortable in using the healthful belt by the soft and ventilating layer of the silica gel directly contacting the skin of the user.

Abstract: A healthful belt mainly has plural silicone rubber projections possessing far-infrared energy on the surface of an elastic cloth. When the belt is worn on or wrapped around the sore spot, the silicone rubber projections is to contact with the skin directly, the far-infrared energy sinking into the skin organization and a knee so as to improve blood circulation, metabolism and immunity function, diminishing fatigue and pain and helpful to health of human bodies.