Hence, realizing the means to replace the degenerated photoreceptor cells artificially, gives hope of regaining visual sensation for patients inflicted by th
Electrical apparatus tend to become smaller in size and more powerful in function selleck with the progress of the microelectronics and semiconductor fabrication technology. However, the power consumption density Wortmannin ATM in an integrated circuit (IC) chip and the electrical apparatus increases rapidly so that the thermal effects in them become more serious. In order to make the IC Inhibitors,Modulators,Libraries chip and apparatus operate safely and stably, now a temperature switch is widely used to monitor the temperature of the apparatus Inhibitors,Modulators,Libraries and to control their power consumption (thermal-protection).
How to realize a programmable temperature switch with high performance, small size and low power consumption is an important study issue.
Inhibitors,Modulators,Libraries This paper presents a novel uncalibrated CMOS programmable temperature switch with high temperature accuracy.Thermistor and memory Inhibitors,Modulators,Libraries alloy switches are traditional critical temperature Inhibitors,Modulators,Libraries switches based on thermal-sensitive materials. These switches have disadvantages Inhibitors,Modulators,Libraries of low precision and high cost. They can not be integrated into IC chip with a standard silicon CMOS process. On the other hand, some CMOS temperature switches have been reported. These temperature switches usually consists of a temperature sensor and a comparator.
The temperature sensor outputs a voltage (or current) signal which is proportional to absolute temperature (PTAT); then the comparator compares the signal with a reference voltage (or current) Inhibitors,Modulators,Libraries and outputs a logic signal.
The value of the reference voltage determines threshold temperature Tth of the switch [1]. The circuits in the temperature switches are complicated Inhibitors,Modulators,Libraries and have large power consumption. Recently a new type of subthreshold CMOS temperature switch was reported [2]. The temperature switch is simpler and its power consumption is lower. But, one of its disadvantages is that the threshold temperature Tth varies evidently with process variation. Another one of its disadvantages is that Tth hysteresis is too large when the temperature is first increased and then is decreased.
This paper proposes a novel threshold temperature Tth programmable Drug_discovery uncalibrated(need not to be uncalibrated after fabrication) CMOS temperature switch with high temperature accuracy.
It consists of a basic temperature switch, a threshold temperature setting module and a sampling and readout module. The temperature switch has some advantages: 1) the circuit structure is simple; 2) its power consumption is low; 3) the threshold temperature can be LEE011? controlled and programmed and 4) the hysteresis of Tth can be controlled. GSK-3 The paper is organized as follows. Section 2 gives the temperature switch circuitry and describes its operating during principles. In Section 3, the implementation of the temperature is described. Section 4 shows the measurement method and measurement results.