This invention relates to semiconductor integrated circuits which find utility in analogue systems. An integrated circuit of the invention comprises an array of configurable analogue cells each of which is capable of interconnection with other cells in the array by means of an interconnection network. Each of the cells can be selectively and individually selected by means of select signals and emanating from shift registers. When selected the cell may be configured with configuration data which ...

A method of Digital to Analogue conversion of an input signal D.sub.o for suppressing the effect of clock-jitter in a Delta-Sigma analogue to digital converter, or class D amplifier, comprises charging a capacitor to a reference voltage value (V.sub.ref) during a first phase (.phi.) of a clock signal, discharging the capacitor during a second phase (.phi..sub.2) of the clock signal, wherein the discharge is regulated by a biased transistor, responsive to the voltage on the capacitor, in a first ...

Scale with a digital display and an additional analogue display, the latter comprising at least one group of optically activable elements forming a row, each element corresponding to a value range of results of weighing operations, the length of the higher order range being at least ten times the length of the lower order range, all elements corresponding to value ranges lower than the value range to be displayed being activated.

The analogue filter system is constituted by first and second analogue filters having similar characteristics, a delay device connected between the first and second analogue filters and controlled by a timing circuit for storing the output of the first analogue filter and for producing an output with its time axis inverted, and a device for restoring the time axis of the output from the delay device.

An analogue-to-digital converter comprising a plurality of stages in series, each stage including a full wave rectifier with two inputs and two outputs. Each of the inputs receives an analogue signal together with a constant current such that the full wave rectifier current reverses direction when the analogue signal reaches a predetermined level. Temperature compensation means are provided comprising voltage generators connected to the rectifier to provide a voltage bias thereto so as to enable...

Semiconductor charge devices are defined to effect a serial-to-parallel conversion of analogue signal information. In one aspect of the invention, a digital signal is extracted from an analogue noise environment by a shift register correlator comprising a bucket-bridge configuration of field-effect transistors in combination with gating field-effect transistors which are effective to weight the amplitude of the data in corresponding bits of the shift register. The gates of the gating transistors...

Method and apparatus of converting between digital and analogue signal formats, wherein dither signals are combined with information signals to be converted, the dither signals being as a predetermined plurality of particular discrete frequencies that are outside desired information signal bandwidth and have orderly relation including to signal conversion sampling rate, which orderly relation aids looping of sequences of patterns in a related data stream having pattern-to-pattern transitions sim...

A system for the simultaneous storage of a plurality of components of data signals and for the retrieval and the processing thereof. The system includes a signal source coupled to a record unit that is synchronized by a record controller. A plurality of cathode ray tubes and optical imaging means are included in the record unit for storing the plurality of simultaneously occurring input signal components on a photographic film in an interleaved pattern. A single readout device scans the film in ...

A control circuit for an electrostatic precipitator, in which an analogue voltage indicative of the desired precipitator electrode potential is stored and periodically increased in the absence of any condition, notably a falling electrode potential, that the desired voltage is excessive in which case the stored potential is reduced.

An analogue electronic alarm timepiece has a dial on which time is displayed by the usual hour, minute and second hands. The time for which the alarm is set is displayed digitally in an aperture provided in the dial. The digital display of the alarm time is effected by means of a rotatable hour wheel having hour indicia thereon and a rotatable minute wheel having minute indicia. The hour wheel and minute wheel are selectively rotatable by manual operation of an external stem. The hour wheel and ...