Showing papers on "Switched capacitor published in 1972"

Exact Analysis of Linear Circuits Containing Periodically Operated Switches with Applications

Abstract: An exact analysis of linear circuits containing periodically operated switches with exponentially modulated cisoidal inputs using the state-space approach is presented. Explicit closed form solutions for both the time and frequency domain suitable for digital computation are obtained. The analysis is applicable to any circuit configuration and can handle cases in which discontinuities in state variables occur at the switching instants. Applications of this analysis to the design of switched filters and modulators are discussed.

Power regulation by means of a switched capacitor

Abstract: A bridge of four solid-state switches with a capacitor in one diagonal is connected in series between the supply and the load. The switches (thyristors) periodically reverse the current-flow direction through the capacitor. The load power is controlled by varying the switching frequency. The device may be used for the control of direct current and alternating current.

Active RC filters containing periodically operated switches

Abstract: The state-variable approach to inductorless filters that utilize resistors, capacitors, gyrators, controlled sources or negativeimpedance converters (NIC), and switches suitable for integration is described. By using the state equations of active RC networks in the standard form, it is shown that multiplications of resistances, gyration conductances, transfer coefficients of controlled sources, and NIC in active RC network can be achieved by means of the switching technique. From these results, the relations between the input and the output at signal frequency of active RC filters containing periodically operated switches are derived at the steady state for the case where the switching frequency is much higher than the signal frequency. The results show that the cutoff and the center frequencies of active RC filters are adjustable by changing the ratio of the on duration in a period to the period of switching. The experimental results of low-pass, bandpass, and high-pass filters are shown along with the theoretical curves.

Frequency-to-voltage converter device

Abstract: A frequency-to-voltage converter for use with such devices as magnetic tape handling equipment is provided having a frequency error signal generator providing pulses, a constant current generator, a capacitor and two switches controlled by the pulses. One of the switches discharges the capacitor within a fixed time interval and the other switch connects the capacitor to the current generator for a time interval determined by the pulses. The capacitor is thus charged to reach a voltage of the next pulse, thereby providing a voltage across the capacitor terminals which is a continuous voltage error signal suitable for control purposes.

Design Criteria of Commutation Circuit in a DC Chopper

Abstract: Commutating capacitor voltage and current equations are derived for the commutation period of the main and auxiliary SCRs. The circuit turn-off time is computed as a function of x, where x is the ratio of the maximum load current to be commutated to the peak discharge current of the commutating capacitor. A suitable choice of x is suggested. In addition to the worst case design for L1, L2, and C, a nomograph for the selection of L1, L2, and C is given as a function of x.

Special Spark-Gap Switches For Use in Synthetic Test Circuits

Abstract: In technology concerned with proving the performance of modern high-power circuit-breakers, special spark-gap switches have been developed to meet the specific requirements of 'break' and 'make-break' synthetic circuits, the former operating up to equivalent three. phase test levels of 30 G.V.A. This paper describes the design, performance, characteristics and operating experiences for two types of specialised triggered switches incorporated in the Synthetic test circuits of the Reyrolle Short-Circuit Testing Station.

A 150 NSEC access, 1024 word by 1 bit p-channel switched capacitor RAM

Abstract: IGFET switched-capacitor memory cells form the heart of a fully decoded dynamic. 1024-word by 1-bit p-channel random access memory. With 10V drive circuitry, chip access time is measured to be 150 nsec and cycle time is 300 nsec. On-chip power dissipation at a 300 nsec cycle is 100 mW (100 mW per bit) and is correspondingly lower at lower speeds. Refresh power at 100°C is less than 1 µW/bit.

Controlled stability of flip-flop circuit

Abstract: This novel working principle for a solid-state switch allows the realization of an especially simple mechanical-electrical converter for binary signals. It may be controlled by small, variable capacitances, but there are neither low-level stages nor ac. The monolithic integrated model circuit described contains only transistors and resistors.