Variable capacitors are key elements in electrostatic micro-power generators. In such devices inertial forces are used to do work against the electric field of the capacitor, thereby converting mechanical energy to electrical potential energy that can be extracted by a suitable circuit. Applications are envisaged in portable, wearable or implantable electronic devices where body motion could pr...

This paper presents a passive LC wireless sensor for measuring temperature. The sensor is designed as a parallel connection of a spiral inductor and an interdigitated capacitor and it was fabricated in a conductive layer using LTCC (Low Temperature Co-fired Ceramic) technology. The inderdigitated capacitor electrodes were coated with a thin film of bismuth doped barium titanate (Ba0.9Bi0.066TiO...

Switched Capacitor circuits are Pervasive in highly integrated, mixed signal Applications. Switched capacitor circuits fill a Critical role in analog/digital interfaces particularly highly integrated applications. This Chapter describes the basic building blocks that Comprise switched Capacitor circuits. These Blocks are the sample-and-hold (S/H), gain Stage. From these elements more complex Ci...

Aluminum electrolytic capacitor (AEC) is one of the weakest components in power electronic converters. As degradation AEC happens, its equivalent series resistance (ESR) increases and capacitance ( C) decreases. Therefore, online monitoring ESR C to predict AEC's life has great significance for ensuring safe reliable operation In this article, an scheme proposed buck converters, aiming estimate...

Figure 1 shows the equivalent circuit of a transimpedance amplifier and a high-impedance source. IS represents the output current of the source. CS is the sum of the source’s output capacitance and the op amp’s input capacitance. RF, with the help of the op amp, converts IS to a voltage. At low frequencies, the op amp’s inverting input is forced to be at ground potential and IS must flow throug...

An inherent problem of single-phase rectifiers is the existence of a pulsating portion in the input power, which pulsates at twice the grid frequency. If this pulsating power is transferred to the DC-link, it causes a significant amount of second-order harmonic at the output voltage. Since in many applications, such a high level of DC oscillation is not acceptable, so the pulsating power must b...

This paper presents a high-frequency frdly differential BiCMOS operational amplifier designed for use in switched-capacitor circuits. The OP amp is integrated in a 3. O-GHZ, 2~m BiCMOS process with an active die area of 1.0 mm x 1.2 mm. This BiCMOS op amp offers an infinite input resistance, a dc gain of 100 dB, a nnity-gain freqnency of 90 MHz with 45° phase margin, and a slew rate of 150 V/ p...