# Thesis About Low Power Circuits for Miniature Sensor Systems

In the thesis we can read things regarding temperature, oscillator, voltage, sensor, and consumption. Lots of info related to timer, measurement results, simulation, measurement, and diagram are described in this thesis.

This thesis tells the reader discussion related to frequency, circuits, the temperature sensor, circuit, and simulation results. The following are taken from this thesis:

Power Density (µW/cm3 ) 15,000 – direct sun 150 – cloudy day Solar (indoors) 6 – oﬃce desk Vibrations 200 0.003 @ 75dB Acoustic Noise 0.96 @ 100dB Daily Temp. Assuming at the beginning of power on, every node has initial 32 bn1 (to osc.) c[2] c[1] bn M s1 (from bias) bn1 Ms2 + – A0 + bn2 c[3] CL Ms bn(from bias) A2 – + bn2 Mc A1 CL c[1] (a) (b) Figure 2.11: Circuits for charge holding. The fractional temperature coeﬃcient (T CF ) of Id6 is 1 dId6 · Id6 dT 1 = · Vdd − Vna − Vos (3.3) T CF (Id6 ) = 1 dRref dVna − · dT Rref dT (3.4) To reduce the non-ideal temperature eﬀect on the sensor we do the following: 1) the resistor is chosen so that the second-order temperature coeﬃcient (TC2) is minimized; Sensor Inaccuracy (◦ C ) Power Consumption Technology Area (mm2 ) Temperature range (◦ C ) Conversion rate (samples/s) [88] [89] [90] [91] [65] [86] This work ±1 ±1 ±0.1 -0.7/+0.9 -1.8/+2.2 ±1 -1.6/+3 7µW 1mW 247.5µW 10µW 10µW

Furthermore, this thesis presents more things like monitoring system, system, power consumption, temperature sensor, and samples.