Abstract: An amplifier for a subscriber's line circuit comprising an extra transistor whose base-emitter junction is connected across a resistor which is arranged in series with the main current path of the output transistor of the amplifier. Furthermore, a supply source is connected to the output terminal of the amplifier via the main current path of the additional transistor and an impedance for supplying at least a portion of the line current of a subscriber's line connected to the output terminal, in order to reduce the dissipation in the semiconductor elements of the amplifier.

Abstract: A Darlington-connected semiconductor device comprises a pre-stage transistor having multi-emitter electrodes and a rear-stage transistor having multi-base electrodes. The multi-emitter electrodes of the pre-stage transistor are connected to the multi-base electrodes of the rear-stage transistor through a plurality of resistors, respectively.

Abstract: A multistage transistor amplifier for amplifying alternating voltages which comprises at least two successive cascade-connected amplifier stages having d.c. feedback. A following amplifier stage is a.c. coupled to the output of the cascade-connected amplifier stages and a resistor is connected between the output of the cascade-connected amplifier stages and the input of the following amplifier stage. The cascade-connected amplifier stages supply the following amplifier stage with direct current, the d.c. operating resistance for the following amplifier stage including the cascade-connected amplifier stages and the resistor.

Abstract: Amplifier for aperiodic signals with a base-coupled and an emitter-coupled differential amplification stage in which the emitters and the bases of the two differential amplification stages respectively form an input of which one can be charged with a signal and the respectively other one is capacitively grounded; a third input lies at the directly coupled emitters of the emitter-coupled differential amplification stage; the collectors of both differential amplification stages are cross-coupled; the bases of the base-coupled differential amplification stage is connected to supply potential with a series resistor; static dc currents are fed into the inputs so that a current of the same magnitude flows over the inputs at the bases and emitters of the differential amplification stages and a current of double magnitude flows over the third input.

Abstract: A pulsed microwave power amplifier for radar transmitters having a class B operated first stage field effect amplifying transistor, which is gate biased to pinch-off in the absence of an input pulse is disclosed. The drain current pulse induced in response to the input RF signal appears as a voltage, which is stepped up through a Ruthroff transformer to turn on a bipolar transistor which switches a gate of a second stage field effect transistor from pinch-off voltage to a voltage corresponding to the drain current substantially equalling 1/2 I.sub.DSS to operate class A for the second stage of amplification. A third stage of amplification may be utilized, wherein its field effect transistor, which is also biased to pinch-off is operated in response to the amplified signal.

Abstract: A differential amplifier, preferably comprised of N-channel MOS devices and having a high ratio of differential gain to common mode gain, has an input stage which receives first and second potentials and amplifies the difference therebetween. Additional amplifying stages each include a depletion input load device having a gate which is coupled to the second potential for balancing the switching points of each additional stage over the common mode range.

Abstract: Disclosed is a high-frequency amplifier circuit which comprises a first transistor with its base coupled to a high-frequency input terminal and grounded through a first diode and emitter grounded, a second transistor with its emitter coupled to the collector of the first transistor, base grounded through second and third diodes and coupled to a reference power supply terminal through a resistor, and collector directly coupled to the reference power supply terminal, and a third transistor with its base coupled to the emitter of the second transistor, emitter grounded, and collector coupled to an output terminal.

Abstract: A transistor amplifier having a first amplifier circuit with a first transistor having applied to its control electrode an input voltage. The ratio of the output voltage of the first transistor to the input voltage is approximately one. A second transistor circuit has a second transistor with its control electrode being directly supplied with the output voltage of the first transistor. The first and second transistors are bipolar transistors of the same type of conductivity with the respective bases used as the control electrodes.

Abstract: An amplifier having a high gain in a selected frequency band, e.g. for the preferential amplification of a pilot oscillation, consists of a plurality of cascaded stages each comprising an active component, a coupling network and a negative-feedback network. The coupling and feedback networks are alternately connected in a series circuit between a signal input and a signal output, each of these networks (with the possible exception of those associated with the first stage) comprising a damped parallel-resonant circuit with an inductive branch forming a low-ohmic path for direct current. Each active component has an input electrode connected through a stabilizing resistor to the junction of the associated coupling and feedback networks, its output electrode being tied to the downstream end of the corresponding feedback network.

Abstract: A multiple-stage active RC distributed filter having multiple inputs and a single output for producing filtering of large groups of notes for tone coloration in electronic musical instruments. Output signals from the keying circuits may be applied to selected input stages of the filter through a resistor matrix to produce the desired tone coloration. Voicing may be further modified by one or more compensation networks at the filter output.

Abstract: An electrically operable stimulator for the control of pain or for other purposes through muscle and/or nerve stimulation by application of electrical pulses to the body of an animal, such as a human being. The stimulator generally comprises an internal power supply which may be rechargeable and which operates in conjunction with a pulse generator and an output amplifier. The pulse generator includes a unijunction transistor multivibrator and which is uniquely designed to achieve low current drain. Pulse interval and pulse width and pulse amplitude are controlled through separate and non-interacting controls. The output amplifier provides an output which is an excellent impedance match to the animal body for controlled stimulation. The output amplifier is uniquely designed to draw current only in proportion to the amount required, so that the entire apparatus is highly efficient.

Abstract: A voltage follower circuit comprises an input terminal; an output terminal; first and second power supply terminals; a first transistor of one conductivity type having a base connected to the input terminal; a second transistor, opposite in conductivity type to the first transistor, having a base connected to the collector of the first transistor, a collector connected to the output terminal and an emitter connected to the first power supply terminal; a third transistor having a base and collector connected to the output terminal and an emitter connected to the emitter of the first transistor; a fourth transistor of the one conductivity type having an emitter connected to the second power supply terminal; and a fifth transistor of the one conductivity type having an emitter and base respectively connected to the emitter and base of the fourth transistor and a collector connected to the base of the fourth transistor and to the first power supply terminal through a resistor.

Abstract: An amplifier circuit for the unadulterated transmission of phase information of a supplied ac voltage signal over a large dynamic range includes a series connection of a series of similar amplifier stages each of which is followed by a symmetrical limiter. The amplifier operates as a logarithmic amplifier for maintaining the amplitude information of the supplied ac signal. Each of the amplifier stages comprise an emitter-base transistor amplifier circuit having negative feedback and an output circuit which contains a resonant circuit which is strongly damped by an attenuating resistor and whose capacitance is formed by a trimmer capacitor connected in parallel to a pair of diodes. The diodes are connected in anti-parallel relation to one another and represent the limiter. The capacitance is adjustable for purpose of impedance adjustment and is set in such a manner that the resultant resonant circuit impedance is capacitive.

Abstract: A new integrated circuit in which bias currents are supplied by means of a current injector, a multi-layer structure in which current is supplied, by means of injection and collection of charge carriers via rectifying junctions, to zones to be biased of circuit elements of the circuit, preferably in the form of charge carriers which are collected by the zones to be biased themselves from one of the layers of the current injector. By means of said current injector circuit arrangements can be realized without load resistors being necessary, while the wiring pattern may be very simple and the packing density of the circuit elements may be very high. In addition a simple method of manufacturing with comparatively few operations can in many cases be used in particular upon application of transistors having a structure which is inverted relative to the conventional structure.