Parasitic capacitance

About: Parasitic capacitance is a research topic. Over the lifetime, 10029 publications have been published within this topic receiving 110331 citations.

Issues regarding the capacitance of 1-10 MHz transformers

Abstract: Capacitive modeling issues are addressed, particularly with respect to minimizing leakage inductance. Reasonable assumptions about the winding configuration and the distribution of voltage around it are made. The total electrical energy stored in the winding when a voltage is applied is then calculated and partitioned into the differential and common-mode parts. A description of how the common-mode current flows is discussed, and the tradeoff between leakage inductance and capacitance is quantified. Some experimental results are provided. >

Charge pump circuit for use in a phase locked loop

Abstract: A charge pump circuit in a phase locked loop comprises a main circuit block and an excess current cancel block for canceling a spike current. The spike current is generally supplied by a parasitic capacitance in the main circuit block and generates a jitter in the output of the phase locked loop. The excess current cancel block supplies or drains a cancel current which is substantially equal to the spike current but flows in a reverse direction.

Stray capacitance of a two-layer air-cored inductor

Abstract: A new analytic method for predicting the stray capacitance of a double layer coil with conducting shield and air core is presented. The method involves construction of a two-layer turn-to-turn circuit model, which includes the self-inductance and resistance of each turn, the mutual inductance representing the flux linkage between all turns, and the capacitance between adjacent turns and the capacitance between the outer turns and conducting shield. At high, low and zero frequency the model is reduced to an effective capacitance, inductance, and resistance respectively: for frequencies below the first self-resonant frequency the behaviour of the circuit is approximated by an RLC circuit. A new result is a recursive calculation of the stray capacitance of the high frequency circuit model. The method and stray capacitance value are compared to alternative models and stray capacitance predictions, and the limitations of the different approaches discussed. Comparisons with experimental measurements show good agreement at the fundamental self-resonance and confirm that the effect of a conducting shield is likely to be small for a closely-wound coil.

Analysis and Design Techniques of CMOS Charge-Pump-Based Radio-Frequency Antenna-Switch Controllers

Abstract: Analysis and design techniques of charge-pump-based RF antenna-switch controllers are presented. Loading effects of RF antenna switches that cause voltage drop of the controller have been identified and embedded in the analysis. The proposed analysis also captures effects of MOS-switch on-resistance and parasitic capacitances, so more precise descriptions of the charge-pump output voltage can be obtained. Furthermore, the body biasing technique has been employed to prevent latch-up. The analysis and the design techniques have been verified using a 0.35-mum CMOS technology. RF antenna-switch performances with the designed controller have also been measured and presented.