摘要:
A digital-to-analog conversion (DAC) circuit (32) and trigger comparator (34) combination is described for encoding and decoding charge packets in a common-well multi-level signal charge-coupled memory device (CCD). The DAC circuit, which may be of the weighted capacitor type, is used to generate a staircase waveform and to create the common-well under a first gate (14) in the CCD. The trigger comparator adjacent to a second gate (16) in the CCD is a detection circuit which stays in one binary state until an input charge signal is received, whereupon it switches state, In particular, the weighted capacitor DAC contains an extra offset bit which is used in the analog-to-digital or regeneration operation such that when the trigger comparator (34) switches state, the digital input to the DAC (32) at that time correctly represents the signal charge being converted. In one embodiment a circular serial-parallel-serial memory structure (37) is employed as the multi-level CCD memory system.
摘要:
A copier includes an automatic document feeder (16) a semi-automatic document feeder (14) and a control system coupled to the feeders by busses A to D. A control button 122, when depressed, causes the control system to switch into a suspending/commencing mode in which a current copying task employing one of the feeders is suspended and a further copying task employing the other feeder is entered. At the end of the further task, the current task continues from the point at which it was suspended.
摘要:
In a computer system the operating speed is increased by increasing the number of general registers (4) with a plurality of implicit registers (9) in an associative memory (3). An instruction (6) generated in a processing unit (1) for data access provides parameter words, such as base and displacement words, to be used as search arguments for an associative search for data in the implicit registers. If a match occurs, the data from the selected register is transferred to the processing unit (1) and the address generation started by the instruction for a memory (2) access is terminated.
摘要:
Pulse light is applied through a piano concave lens (14) to a thin metal film (15), which is evaporated on the concave side of the lens. The lens, which is formed of a high thermally insulating material such as glass, for example, and the film are disposed within a liquid (11) such as water, for example. The pulsed light is absorbed by the metal film, which converts the thermal energy produced by the pulsed light into elastic waves in the form of acoustic waves and simultaneously focuses the acoustic waves on an ojbect (20) within the water at a selected focal plane. The metal film is as thin as possible, consistent with complete absorption of the light energy by the metal film, so as to utilize the high thermal expansion coefficient of the water.
摘要:
A push-pull driver circuit wherein the input signal (1) is applied to turn on one (6) of two transistors (5, 6) mounted in series and the inversion of that signal is applied to the second transistor (5) in the series path and the output taken from between then operates to isolate the load and since one and only one of the two transistors in the series path is conducting there is a path to charge and discharge the load capacitance (3) but no path through both devices for power dissipation. The driver circuit can be built into a 2-bit partitioning circuit (23) which in turn, when used with a programmed logic array (20) and the relative capacitance of the various parts being isolated from each other byacoupling circuit (54) , the resulting assembly provides a high performance programmed array logic device.