Abstract: The invention generally relates to a switching power amplifier, particularly for high power, highly efficient audio amplification. The power amplifier operates at a high switching frequency and includes a generator. The generator is coupled to receive the line voltage for converting it into a high frequency generator signal and includes at least one capacitor for storing a DC voltage. A bidirectional switch is coupled in series with the output of the generator for selectively applying the generator signal to the load via a low-pass filter, for providing a correction of the output signal of the amplifier. The shape, magnitude and frequency of the generator signal are not essential. The switch is the only power component which must be responsive to the input and output signals of the amplifier, and the generator signal. Generally, it can be switched at any time as to allow the correction. The low-pass filter having an inductive input is employed.

Abstract: This flash analog-to-digital converter (ADC) offers the fastest possible high resolution conversion as the quantization level of the input signal is determined in a straightforward structure, whereby no feedback exists. For instance, a 16-bit flash ADC employs approximately 555 rather than 65,535 comparators normally required. In another embodiment only approximately 150 comparators are required. One or two noninverting amplifiers are used.In the preferred embodiment, the ADC input signal is applied to a resistor network coupled between the ADC input and a reference current source. A plurality of comparators is coupled to the resistor network for comparing comparison signals deriving therefrom against ground, and producing a first code. In response thereto, a multiplexer selects one of the comparison signals which is amplified and then converted in an ADC unit into a second code.

Abstract: The invention relates to an operational amplifier (OA) or comparator circuit with minimized offset voltage and drift, particularly for analog and/or digital systems requiring high speed and high accuracy signal processing, such as integrators, analog-to-digital converters, etc. The provided OA and comparators circuits retain a high speed and have a drastically increased accuracy. No correcting amplifier is necessary. The gain set by external components is insignificant. Widely available high speed switching components can be used. The tolerance of the passive components used is not critical. The values of the capacitors are determined by the switching frequency and amount of the input bias current of the employed OA. A FET OA can be used as its very large offset voltage and drift can be easily compensated.

Abstract: The invention relates to an operational amplifier, particularly for signal amplification requiring high accuracy and extremely high speed which includes bandwidth, slew rate and settling time. A current feedback can be implemented with a low impedance inverting input for an increased high frequency performance. The operational amplifier according to the present invention has an input stage providing a pair of output signals, thus preserving a differential nature of the input signal of the operational amplifier. A power amplifier means is coupled to the input stage for amplifying and converting the output signals thereof into a single output signal. A very high open loop gain and save phase margin are obtained with a low number of amplification stages as the input stage has inherently a high voltage gain and the output signals thereof are amplified separately, whereby the common base configuration is preferred.

Abstract: The invention relates to switching power supplies receiving AC line voltage or DC voltage, particularly for highly efficient regulators operating at high switching frequency. The power supplies contain at least two switches being switched independently of each other; their individual parts can even oscillate autonomously. The energy is stored in at least one capacitor charged by high frequency current pulses. The discharging is independent of the user and also when the output resistance of the line is high so that the output ripple is very low, no minimum load is required and the power failure protection is inherent. The input current of the power supply is uninterrupted. Furthermore, there are no surge currents and any voltage spikes are eliminated; no snubbers are required. EMI/RFI are extremely low. Thyristors and triacs can be employed as they can be turned off by one of the remaining switches. The switching power is actually also an operative power amplifier with an extremely short response time.

Abstract: The invention relates to an operational amplifier (OA) particularly for signal amplification requiring wide bandwidth, high slew rate, and fast settling time. The OA contains two voltage followers rather than differential amplifier in the first stage. The OA has very low number of the components, especially resistors. The common base as the operation mode of the transistors is favored in order to achieve a very high and fastest possible signal amplification. The OA provides a pair of emitter followers having outputs coupled across the base and emitter of a transistor and an amplifier coupled to supply a current to the base of the transistor in response to the collector current thereof.

Abstract: The invention relates to an operational amplifier (OA) with reduced offset voltage, particularly for A/D and D/A converters, S/H amplifiers, measuring instruments. The OA may also be used for applications where previously fast or precision OA's have been used.The basic circuitry of the OA consists of four resistors arranged in series, a fast OA B and preferably a precision OA A. The values of the resistors may be matched in such a way that the offset voltage of the OA B is totally eliminated or is canceled out by the offset voltage of the OA A, which makes it possible for the offset voltage of the entire circuit to be very small. Reduction of the input currents is also possible.

Abstract: A push-pull power amplifier with quiescent current regulator, in particular for low-frequency power amplifiers of high quality in which the quiescent current or currents of the output transistors is or are sampled at a predetermined output voltage and/or in a predetermined output voltage range of the amplifier, their values coded in one or more comparators and in one or more storage elements the corresponding values with which the desired values of the quiescent current or currents can be corrected or held are stored.