Abstract: A integratable transmitter/receiver configuration for higher frequencies includes a reception path mixer multiplying a reception signal and a carrier frequency signal with one another. A controlled first intermediate frequency oscillator can be turned off by a switch control signal and has a frequency range being reversible by a first range control signal. A demodulator is connected downstream of the reception path mixer and receives the output signal of the first intermediate frequency oscillator both directly and phase-displaced by 90.degree.. A phase detector device is connected downstream of and controls the first intermediate frequency oscillator, and has a frequency range being reversible by a second range control signal. A controlled second intermediate frequency oscillator is connected parallel to the first intermediate frequency oscillator and can be turned on by the switch control signal.

Abstract: A low-noise amplifier stage with reversible amplification includes a first series circuit of load paths of two transistors which is connected through a resistor to ground. A second series circuit or n series circuits of load paths of two transistors is likewise connected through a resistor to ground and is connected parallel to the first series circuit. Parallel-connected collectors of the first transistors of the series circuits are connected through an oscillator circuit to a supply voltage terminal. Two reference voltage sources are provided for supplying a first reference voltage to base terminals of the first transistors of the series circuits and for supplying a second reference voltage to base terminals of the second transistors of the series circuits. A reversing device connects a node point of the load paths of the transistors of the second series circuit to a supply voltage terminal as a function of a control signal.

Abstract: A circuit configuration includes a limiter amplifier having n series-connected limiter stages. The limiter stages are alternatingly direct-current coupled and alternating-current coupled. A detector circuit is connected to the limiter amplifier.

Abstract: An integrated circuit includes first and second oscillators. A controllable switch has a signal input connected to a signal output of the second oscillator. A modulator has two signal inputs each being coupled to a signal output of a respective one of the first oscillator and the controllable switch. At least one controllable reversing switch has two signal inputs each being connected to a signal output of a respective one of the modulator and the controllable switch. A controllable frequency divider has a signal input connected to a signal output of the second oscillator. Two signal input terminals are each connected to a modulation input of a respective one of the oscillators, and two input terminals are each connected to the frequency control input of a respective one of the oscillators. Signal output terminals are each connected to the signal output of a respective one of the first oscillator, the at least one controllable reversing switch, the frequency divider, and the second oscillator.

Abstract: A frequency modulation oscillator circuit includes an oscillator stage having two emitter-coupled transistor pairs, each being fed from at least one controllable current source, and at least one trigger stage for triggering the controllable current sources for the two transistor pairs.

Abstract: An oscillator includes at least one oscillator transistor having collector, emitter and base leads, a controllable current source connected between the emitter lead of the at least one oscillator transistor and a supply potential, and a frequency-determining element, such as an oscillating circuit, connected at least to the base or collector lead of the at least one oscillator transistor. A method for controlling the amplitude of the output signal of the oscillator includes supplying a direct voltage variation at the emitter lead of the at least one oscillator transistor resulting from a change in amplitude of a signal applied to the base lead of the at least one oscillator transistor as a controlled variable for the current of the controllable current source. The oscillator may also include a control amplifier. The emitter lead of the at least one oscillator transistor is connected to one input of the control amplifier and the other input of the control amplifier is connected to a reference potential.

Abstract: An integrable variable-frequency oscillator circuit with a feedback amplifier configuration includes first and second input terminals. A frequency-determining feedback element is connected between the input terminals. First and second amplifier stages have inputs connected to the first input terminal and outputs supplying output signals generated by the amplifier stages. The second amplifier stage has a variable gain. A first phase-shifting component is connected to the output of the second amplifier stage for receiving the output signal of the second amplifier stage. A third amplifier stage is connected downstream of the first phase-shifting component for generating an output signal. The output of the first amplifier stage is connected downstream of the phase-shifting component for adding the output signal of the first amplifier stage to the output signal of the second amplifier stage.

Abstract: Integrated semiconductor circuit, including a control loop including a first current source acting as an actual value transmitter for the control loop, and a final control element acting on the first current source as a control, the first current source being in the form of a current mirror having a plurality of transistors each forming an output part driving a respective load element, and a second constant current source being independent of the first current source and acting as a desired value transmitter for the control loop.

Abstract: A monolithically integrable amplitude-controllable oscillator amplifier circuit includes a differential amplifier having capacitors and transistors, some of which form a cascode circuit and some of which are connected to various potentials, as well as a frequency-determining circuit element connected to the oscillator amplifier, amplifier outputs providing output signals and resistors connected to the transistors. A first current source is formed of a series circuit of a second current source, a constant current source and a circuit node. A control circuit for the oscillator amplifier controls amplitude as a function of the output signal and has a control element with a first voltage-controlled current source. A controller provides an actual-value detection by rectification, an input signal mean-value suppression with a differential amplifier, and a set-point setting. The controller feeds a control variable to the first voltage-controlled current source.

Abstract: A monolithically integrable amplitude-controllable oscillator amplifier circuit includes a differential amplifier. The bases of first, second and third transistors are acted upon by a direct voltage. A first capacitor connects the base of the second transistor to a reference potential. A frequency-determining circuit element is connected to the base of a first transistor, the collector of the second transistor and the oscillator amplifier. The collector of the first transistor is connected directly to the emitter of the third transistor forming a cascode circuit. The collector of the third transistor is connected to a first potential. The collector of the second transistor forms an amplifier output. A first resistor is connected between the collector of the second transistor and a second potential.

Abstract: A monolithically integrable controller circuit, particularly for amplitude control in oscillator amplifiers, providing an actual-value detection by rectification, an input signal means-value suppression with a differential amplifier, and a set-point setting, includes a signal input of the controller circuit connected to the base contact of a first transistor. A low-pass filter is connected to the base contact of a second transistor and to the signal input. The collector contacts of the first and second transistors are connected to a potential. The emitter contact of the first transistor is connected to one of the inputs of the operational amplifier. A first capacitor is connected between the emitter contact of the first transistor and reference potential. A first constant current source is connected between the emitter contact of the first transistor and reference potential. The emitter contact of the second transistor is connected to the other of the inputs of the operational amplifier.

Abstract: An oscillator and mixer circuit of an integrated UHF/VHF modulator circuit includes a single active oscillator circuit to be connected to frequency-determining passive circuits for UHF and multichannel VHF operation, a single mixer part mixing an oscillator signal from the active oscillator circuit with a useful signal, and a reaction-free coupling connected between the single active oscillator circuit and the single mixer part.

Abstract: A differential amplifier circuit includes a first differential amplifier stage formed of a pair of transistors having inputs and output circuits, the inputs of the transistor pair of the first differential amplifier stage forming an input of the amplifier circuit, load resistors having circuits connected to the output circuits of the pair of transistors of the first differential amplifier stage, a circuit output connected to the load resistors, at least two further differential amplifier stages having first and second circuits, a reference input connected to the first circuit of the further differential amplifier stages, a gain control input connected to the second circuit of the further differential amplifier stages, at least the first circuit of the further differential amplifier stages being connected to the output circuits of the pair of transistors of the first differential amplifier stage, the second circuit of the further differential amplifier stages driving the load resistor circuits, and a control s

Abstract: Integrable frequency divider circuit, including a preamplifier in the form of a differential amplifier having a signal input for receiving signals to be processed, a reference input and two outputs, a frequency divider having divider stages including a first divider stage, each being in the form of identical series-connected flip-flop cells, the first divider stage having two inputs each being connected to a respective one of the two outputs of the differential amplifier for receiving the signals to be processed, an operational amplifier having an output directly connected to the reference input of the differential amplifier and having two inputs, two resistors each being connected between a respective one of the inputs of the operational amplifier and a respective one of the outputs of the differential amplifier, a capacitor connected between the inputs of the operational amplifier, and another capacitor connected between the output of the operational amplifier and reference potential.

Abstract: An integrable bipolar oscillator circuit, includes four transistors of the same conductivity type, four resistors, three constant current sources having base points and outputs, a reference potential terminal connected to the base points of each of the constant current sources, a supply potential terminal, and a frequency-determining feedback member, the output of the first constant current source being connected to the emitter of the first transistor and to the base of the second transistor, the output of the second constant current source being connected to the emitter of the third transistor and to the base of the fourth transistor, the emitters of the second and fourth transistors being connected to the output of the third constant current source through a given connection, the collectors of the first and third transistors being directly connected to the supply potential terminal, the first and second resistors each being connected between a respective one of the collectors of the second and fourth transi

Abstract: Integrable differential amplifier having a d-c voltage source delivering a reference potential and a supply potential wherein a first and a second transistor forming a differential amplifier unit have a respective emitter by which they are connected in common with a collector of a third transistor, the first and second transistors having respective base terminals forming respective signal input terminals and being connected via a respective resistance to a common first auxiliary potential, the first transistors and the second transistor having respective collectors, each of which, through the intermediary of a ballast resistance connected to the supply potential and a terminal appertaining to the ballast resistance of the respective first and second transistors, being directly connected, respectively, to a signal output terminal of the amplifier, the respective emitters of the first and second transistors being connected to the reference potential via the emitter of the third transistors, the third transistor

Abstract: Transistor oscillator circuit having a resonant-circuit or crystal-controlled oscillator realized by a feedback differential amplifier and provided for driving a mixture stage including a pair of transistors forming the oscillator and having a current-carrying output connected to a respective input of the mixture stage, the latter being of symmetrical construction, a low pass filter also connected to the current carrying output of the oscillator, a common control amplifier having an output, and respective inputs connected to the oscillator via the low pass filter, and means for feeding back the output of the control amplifier to the oscillator in the sense of negative feedback.

Abstract: Monolithically integrable transistor amplifier including four transistors of the same type having respective emitters, collectors and bases, a signal input connected to the base of a first one of the transistors, the emitter of the first transistor being connected to the emitter of a second one of the transistors, means for providing a power source connected by a terminal thereof to the emitters of the first and second transistors and by another terminal thereof via a respective load resistance to the collectors of the first and second transistors, a third one and a fourth one of the transistors being connected by the respective emitters thereof to one another, the respective bases of the second and the third transistors being connected to one another, the third transistor being connected to the fourth transistor in the same manner, as the first transistor is connected to the second transistor, the respective collectors of the first and third collectors, on the one hand, and of the second and fourth collector

Abstract: Monolithically integrable semiconductor circuit with an amplifier controlled by a photo diode, including a differential amplifier having inverting and noninverting inputs and outputs and a photo diode having a first and a second lead, the first lead of the photo diode being connected in the blocking direction to the inverting input of the differential amplifier, and the noninverting input of the differential amplifier being connected to a reference potential, a coupling resistor connected between the inverting and noninverting inputs of the differential amplifier, a filter circuit and a transistor amplifier being connected in a feedback branch between the noninverting output and the inverting input of the differential amplifier, and the inverting output of the differential amplifier and the second lead of the photo diode being connected to ground.

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.