Abstract: A temperature sensor adapted in a charge and discharge control circuit of a secondary battery, cooperates with a micro-controller of the charge and discharge control circuit. The temperature sensor is a non-polar temperature sensor manufactured by the semiconductor manufacturing technology. The temperature sensor includes a first signal pin, a second signal pin, a first thermal diode, and a second thermal diode paired with the first thermal diode. The positive electrode of the first thermal diode and the negative electrode of the second thermal diode, both connect to the first signal pin. The negative electrode of the first thermal diode and the positive electrode of the second thermal diode, both connect to the second signal pin. The temperature sensor is proofread easily, has a low manufacturing cost, consumes less power and has an excellent anti-interfere capability, etc.

Abstract: A temperature sensor module includes a first temperature sensor configured for sensing the temperature of the environment, and a second temperature sensor configured for sensing the temperature of an eardrum. The first temperature sensor is a thermal diode, and the second temperature sensor is a thermopile. Preferably, the second temperature sensor may be a CMOS-infrared temperature sensor. The first temperature sensor and the second temperature sensor are both made of the semiconductor material such that they have same physical characters and same raising/falling temperature speeds even if entering into the environment with the different temperatures. Therefore, they are proofread easily, have a low manufacturing cost and consume low power.

Abstract: Backward-mapping switched capacitor (SC) differentiators for MOS technology integrated circuit implementation, as well as forward mapping (FM) and bilinear-mapping (BIM) SC differentiators, are disclosed. The SC differentiator is employed in filters either alone or in combination with SC integrators. The filters include biquads, ladder filters, FIR filters, IIR filters and N-path filters.A fully differential operational amplifier with high and symmetrical driving capability is also described.

Abstract: Sigma-delta analog to digital converters based upon switched capacitor delay and switched capacitor differentiator circuits are described. These switched capacitor circuits have the advantages that they are less sensitive to clock feed-through noise, dc offset voltage and power supply voltage, etc. Design examples of one-bit second-order sigma-delta analog digital converter are given to substantiate both design methodology, circuit features and the utility of these new circuit structures.