An analogue amplifier with multiplexing capability, without the need to incorporate a multiplexor, comprising an input port, a test input port, an output port, a control input to switch the amplifier between a normal amplifying mode and a test mode, wherein a analogue signal introduced to the input port is amplified to the output port in normal mode, and a test signal on the test port is routed to the output port when the amplifier is in test mode.

A precision and high-speed analogue-to-digital converter has two separate groups of comparators linked by an intermediate network comprising a digital-to-analogue converter made up of current generators which are controlled by the logical outputs from the first group of comparators. These outputs represent the higher-order bits of the digital equivalent of the analogue input signal which is transmitted to the second group of comparators via a delay line. The digital-to-analogue converter causes ...

A multiple ramp analogue-to-digital converter comprises an integrator connected to receive and integrate an analogue input signal to be converted, and an opposing coarse reference signal. Instead of these signals being applied to the integrator sequentially, as is conventional, they are applied simultaneously. A flash converter is used to provide a rough initial estimate of the magnitude and polarity of the analogue input signal, so that the duration of application of the coarse reference signal...

Apparatus for generating an oscillating signal in a desired phase relationship with an input signal, including a mixer arranged to receive a pair of reference signals oscillating at a common frequency and having a phase offset between them, and to mix the reference signals in variable proportions according to the value of input weighting signals to generate an output signal. A comparator is to compare the phase of the output signal with that of the input signal to determine whether the signals a...

Described is a method of compressing an analogue signal, e.g. a voice signal, the signal function being continuously sampled, quantized and encoded into data words, the difference between each two successive data words determined and each difference value quantized and encoded.

A high/low and low/high analogue level converter circuit for integrated circuits in which a high/low converter circuit comprises, supplied at a first voltage value, a converter module which receives a logic input signal of analogue level adapted to this first voltage value and delivers a logic signal inverted and replicated with analogue level adapted to this first voltage value, and, supplied at a second voltage value, a differential converter module which from inverted and replicated logic sig...

An analogue switch formed on a semiconductor substrate has input and output ports, and a first enhancement mode MOS transistor formed in an isolated well in the substrate material and having its gate connected to receive a control signal, and having one end of its conducting channel and its well connected to the input port. A second enhancement mode MOS transistor is formed in an isolated well in the substrate, and has one end of its conducting channel and its well connected to the input port (2...

A signal convertor comprising a pulse modulator. and means for modifying the signal input thereto in dependence upon the error in previous values or the output thereof, to reduce the effects of said error within a desired signal band.

An electronic watch equipped with an analogue type timer which is capable of shifting the timer from the "minute" stepping mode to the "second" stepping mode in the final part of the length of set time.

Compound of formula (I): ##STR1## wherein: n is 0, 1 or 2, R.sub.1 represents (C.sub.3 -C.sub.11)cycloalkyl or (C.sub.3 -C.sub.11)cycloalkylalkyl, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are selected from hydrogen, halogen, alkyl, alkenyl, alkynyl, perhaloalkyl, cycloalkyl, cycloalkylalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxycarbonyl, acyloxy, carboxy, nitro, cyano, aminocarbonyl (optionally substituted), and the groups (CH.sub.2).sub.p --N.sub.a R.sub.b and --O--C(O)--N--R.sub.a R....