The invention relates to an analogue display device for a timepiece. The inventive device consists of display means which are disposed such as to perform jumps in relation to a dial comprising a haphazard series of values to be displayed.
An analogue/digital interface circuit is disclosed in which an integral bistable circuit has its state changed by the arrival of an incoming analogue signal, however transient, and irrespective of when it arrives relative to the clock signal driving the digital circuit. The use of a bistable (flip-flop) circuit enables each parth of the interface circuit to be traversed when scan test signals are applied to it. Concurrently with the application of such signals, an inhibition signal is applied to...
The invention relates to an analog echo filter for a modem, to which an analog transmit signal is supplied. According to the invention, a passive analog input filter and an active analog filter, whose transfer function is adjustable, are provided. The transfer function of the active analog filter can preferably be switched between a first-order transfer function and a second-order transfer function.
This invention is generally concerned with digital-to-analogue converters and more particularly relates to techniques for reducing signal dependent loading of reference voltage sources used by these converters. A differential switched capacitor digital-to-analogue (DAC) circuit (500) comprises first and second differential signal circuit portions (500a,b) for providing respective positive and negative signal outputs with respect to a reference level, and has first and second reference voltage in...
A programmable analogue device including an array of cells. Each cell is controllable for performing a predetermined set of analogue functions. The cells are selectively interconnected for programming selected analogue circuits. Each cell includes an array of subcells, an output circuit coupled to each of the subcells for delivering an analogue output as determined by the analogue function of an activated subcell, and a function control circuit for activating a particular subcell in dependence u...
The invention concerns an analog-to-digital converter, comprising programmable circuits generating (1) an image electric current proportional to the sum of active voltage values forming a series of voltage levels in geometric progression and corresponding to electric voltage values for which the analog image of the bit weight corresponds to a bit of value 1 and first programmable corrector circuits (2) receiving the image electric current and generating a first corrected analog voltage, being th...
A device for generating a low-consumption controlling analogue voltage of stable value adapted for controlling LCD display segments that comprises an input circuit receiving an analogue voltage of given nominal value adapted to generate a picture analogue voltage of reduced value in a ratio k. A driver circuit is provided to receive the picture analogue voltage as a reference signal and a picture signal derived and reduced in the same ratio k from the low-consumption analogue voltage and compris...
The present invention discloses a device for converting a digital input into an analogue output, comprising means for generating a binary pulse signal in dependence on said digital input, a filter for filtering said binary pulse signal to obtain said analogue output where the level of the analogue output depends on the relation of high and low level pulses of the binary pulse signal during a period and the precision of the analogue output depends on the number of binary pulses during the period....
A switched capacitor digital-to-analogue converter (DAC) 400 for reducing signal dependent loading of a reference voltage source used by the converter comprises an active circuit (102) with a feedback element. The feedback element comprises a feedback capacitor (104), a second capacitor (106) and switches (402, 110) to connect the second capacitor to one of first and second reference sources to store charge on the second capacitor and to connect the second capacitor in parallel with the feedback...
