Abstract:
The inventive circuit arrangement for voltage adjustment comprises a longitudinal adjuster (1) provided with an adjustment amplifier (5) and a charging pump (6) located downstream therefrom. The circuit arrangement also comprises a reference voltage unit (4) which is used to produce a reference voltage (S1) for the adjustment amplifier (5) and a starter unit (3) which is used to produce a starter voltage (UOUT) in order to supply voltage to the adjustment amplifier (5), charging pump (6) and reference voltage unit (4) when the longitudinal adjuster (1) is started.
Abstract:
The invention relates to an integrated circuit comprising at least one voltage regulator, which is connected between a supply potential terminal and a reference potential terminal. The integrated circuit also has at least one useful circuit, which contains a memory and/or logic unit, whose supply potential input is coupled to the output of the voltage regulator. According to the invention, the voltage regulator can be switched off by a first switching device in a power saving mode. The supply potential input of the useful circuit is then connected to the supply potential terminal via a diode circuit.
Abstract:
An accuracy in the data transfer rate of 0.25 % is required according to USB specifications. In order to generate a clock signal, which renders this accuracy possible, the invention enlists the use of a clock generator unit that operates without quartz. The inventive clock generator unit comprises an internal clock generator (11), a pulse counter (17), which is connected to the internal clock generator (11), a pulse number memory (18), and a pulse filter (14). The pulse counter counts the number of the internally generated clock pulses between two pulses of the synchronization signal (16), which are transmitted according to the USB specification. The difference between the determined pulse number and a specified pulse number is evaluated and is used for controlling the pulse filter (14) that suppresses pulses, thereby resulting in the generation of a stabilized clock signal (13).
Abstract:
Une variation de fréquence d'horloge d'un consommateur à fonctionnement synchronisé alimenté en énergie peut être réalisée de manière rapide et efficace avec une influence aussi faible que possible de l'alimentation d'énergie alimentant le consommateur lorsque la variation de cycle d'horloge totale a lieu par une pluralité de variations de cycle d'horloge individuelles avec, chacune, des quantités de variation différentes, donc lorsque la fréquence d'horloge est modifiée de manière non linéaire.
Abstract:
In accordance with the USB specifications, an accuracy of 0.25% is required for the data transmission rate. To generate a clock signal that allows this accuracy, the invention uses a clock generator unit that does not require a crystal. The clock generator unit includes an internal clock generator, a pulse counter that is connected to the internal clock generator, a pulse number memory, and a pulse filter. The pulse counter counts the number of internally generated clock pulses between two pulses of the synchronization signal, which are transmitted in accordance with the USB specification. The difference between the ascertained pulse number and a nominal pulse number is evaluated and is used for controlling the pulse-suppressing pulse filter. This results in a stabilized clock signal.
Abstract:
A frequency regulating circuit for the current-consumption-dependent clock supply of a circuit configuration includes a current measuring device for measuring the instantaneous current consumption of the circuit configuration, a controllable clock supply circuit, which can be connected to a clock input of the circuit configuration, and a control device for driving the clock supply circuit based upon the measured current consumption, an increase in the current consumption of the circuit configuration effecting a reduction in the clock frequency at the output of the clock supply circuit. Such a circuit ensures that a maximum permissible current consumption is not exceeded, but, at the same time, makes possible a maximum power of the circuit by a maximum clock frequency.
Abstract:
The circuit contains a series regulator with an FET. A capacitor and a further FET, which is provided as a transfer gate and is driven by the POR signal, are connected in series between the source terminal, to which the external supply voltage is applied, and the gate connection. When the external voltage is applied, the FET opens, with the transfer gate switched on, corresponding to the charging of the capacitor which now takes place. Because this charging process takes a certain amount of time, overshoots in the internal voltage are prevented.
Abstract:
In accordance with the USB specifications, an accuracy of 0.25% is required for the data transmission rate. To generate a clock signal that allows this accuracy, the invention uses a clock generator unit that does not require a crystal. The clock generator unit includes an internal clock generator, a pulse counter that is connected to the internal clock generator, a pulse number memory, and a pulse filter. The pulse counter counts the number of internally generated clock pulses between two pulses of the synchronization signal, which are transmitted in accordance with the USB specification. The difference between the ascertained pulse number and a nominal pulse number is evaluated and is used for controlling the pulse-suppressing pulse filter. This results in a stabilized clock signal.