Rise time

About: Rise time is a research topic. Over the lifetime, 4748 publications have been published within this topic receiving 47512 citations.

Power-on-reset circuit

Abstract: A power-on-reset circuit includes a plurality of MOS transistors and a first depletion type N-channel MOS transistor connected in series to an input terminal of a current mirror circuit. A capacitor is connected between the input terminal and a voltage supply terminal. A second depletion type N-channel MOS transistor having a low current driving capacity is connected to an output terminal of the current mirror circuit. The degree of integration can be increased by constituting an integrating circuit with depletion type N-channel MOS transistors in place of a resistor. In addition, the voltage supply voltage is compared to the sum of the threshold voltage of the plurality of MOS transistors. This makes it possible to initialize the internal circuit positively even if the rise time of the voltage supply voltage becomes larger than the time constant of the integrating circuit.

Pulsed DC transient conductivity measurement system

Abstract: Methods and apparatus are disclosed herein for measuring the electrical conductivity of unknown fluid solutions. A constant current DC pulse having a very fast rise time is supplied to a test cell containing the unknown solution. By sampling the voltage across the test cell just prior to the application of the pulse and at a predetermined time during the application of the constant current pulse, a voltage difference is obtained which may be interpreted in terms of the conductivity of the unknown solution.

Limit cycle characterization, existence and quenching in the control of a high performance hydraulic actuator

Abstract: The characteristics and the nonlinear dynamics of a high performance hydraulic actuator produced by ASI Inc. are described and modeled. When a feedback is applied for the regulation of output force, a limit cycle is observed. The existence of the limit cycle can a priori be attributed to one, or to a combination of, the four dominant nonlinear effect that were identified in these actuators. In order to pinpoint its origin, successive approximations are made to apply the describing function principle, so as to predict the onset of the limit cycle as function of the feedback gain. Given the experimental data, this method allows us to attribute beyond any doubt its origin to the electromagnetic hysteresis in the valve, which is based on jet-pipe technology. A multiple term lead-lag controller is designed and implemented to quench the limit cycle and improve the rise time of the force control by more than an order of magnitude.

Rise time of pulsed parametric oscillators

Abstract: General relations are derived that describe the rise time of the output power of parametric oscillators driven by a time-dependent pump. Both singly resonant and doubly resonant oscillators are discussed. Results of computer calculations using a Gaussian time envelope for the pump pulse are presented and, in the case of the doubly resonant oscillator, are compared to predictions of a steady-state analysis. Agreement between calculated rise times and published values is good.

A discussion on exponential-gain charge pump

Abstract: This paper presents a discussion about the performance achievable by an exponential-gain charge pump (i.e., by a charge pump featuring a voltage gain which increases exponentially with the number of stages). This charge pump topology is analyzed in terms of both voltage gain and equivalent output resistance. An analytical expression of these two parameters is provided, which allows performance comparison with other charge pump topologies. The expression of the output voltage rise time is also derived.