Showing papers on "Switched capacitor published in 1968"
TL;DR: In this paper, a state-space analysis is given for RC networks containing an arbitrary number of periodically operated switches, and the results are then applied to the design of RC integrated circuits in which large values of resistance are achieved by placing a switch in series with each resistor of small resistance.
Abstract: A state-space analysis is given for RC networks containing an arbitrary number of periodically operated switches. The results are then applied to the design of RC integrated circuits in which large values of resistance are achieved by placing a switch in series with each resistor of small resistance. It is shown that the technique provides excellent desensitivity to environmental change. Finally an experiment verifying the usefulness of the method is described.
31 citations
TL;DR: The theory of filters based on sine and cosine functions leads to frequency filters as discussed by the authors, which can be implemented almost ideally by coils and capacitors, but they are hard to meet by frequency filters: coils are undesirable, and no tuning and no temperature compensation should be required.
Abstract: The theory of filters based on sine and cosine functions leads to frequency filters. They can be implemented almost ideally by coils and capacitors. The arrival of integrated circuits imposes new requirements that are hard to meet by frequency filters: coils are undesirable, and no tuning and no temperature compensation should be required. It is reasonable to look for a theory of filters based on other functions that are more suitable to the demands of integrated circuits, rather than to try to adapt frequency filters to the new technological requirements. Sequency filters based on Walsh functions can be implemented by integrated circuits about as ideally as frequency filters by coils and capacitors.
18 citations
14 citations
TL;DR: In this paper, the authors show that the various approximations involved in the theory are justified on physical grounds and propose a lossless filter from switches, capacitances, and regenerating devices.
Abstract: With switches, capacitances, and regenerating devices, it is possible to simulate the behavior of a transmission line. Hence, one can build lossless filters from these elements. Due to the absence of inductances, this class of filters is particularly suitable for integration. Its losslessness makes it less sensitive to component variation. Experimental work shows that the various approximations involved in the theory are justified on physical grounds.
12 citations
TL;DR: In this paper, the operation and performance of a new type of regenerative switch for square-wave generation is presented. But the operation of the switch is controlled by a single timing capacitor, and the frequency of oscillation can be continuously or in steps over a wide range of frequencies by changing one parameter only.
Abstract: The operation and performance of a new type of circuit for square-wave generation is presented. The circuit is based on the application of two identical regenerative switches using complementary transistors, the operation of which is controlled by a single timing capacitor. Rise and fall times of the output pulses can be made to depend almost entirely on the switching speed of the transistors, and are independent of the values of the elements used in the timing network. The frequency of oscillation can be varied continuously or in steps over a wide range of frequencies by changing one parameter only. With silicon planar transistors used in the regenerative switches, the temperature stability is quite satisfactory, but a simple method for further increase in temperature stability is also discussed. The capacitive (or resistive) loading of the output terminals does not affect the frequency of oscillation. These features make the circuit described very useful in many applications, and particularly in the design of wide-range square-wave generators. An experimental model of the circuit covering the frequency range from 1 Hz to 10 MHz has been built and some results of measurements are presented.
9 citations
TL;DR: In this paper, a low-voltage transistor-switched model capacitor bank is discharged into a full-scale system of conductors and generates a magnetic field whose spatial and temporal distribution is identical with that produced by discharging the high energy bank.
Abstract: A new method of determining high intensity pulsed magnetic field distributions is described. A low-voltage transistor-switched model capacitor bank is discharged into a full-scale system of conductors and generates a magnetic field whose spatial and temporal distribution is identical with that produced by discharging the high energy bank.
1 citations
TL;DR: In this article, the design of SPDT switch using p-i-n diodes and high-impedance transmission line is described. And two operating examples of the method, an 18-GHz bandwidth SPDT and a 12-GHz SP4T, are discussed.
Abstract: Single-pole multiple-throw microwave switches may be designed as extremely broad-band multistate low-pass filters. SPDT switch design using p-i-n diodes and high-impedance transmission line is described. Extension of the technique to multiple-throw switches is outlined. Two operating examples of the method, an 18-GHz bandwidth SPDT and a 12-GHz SP4T, are discussed.
1 citations