Abstract: The disclosed unity gain amplifier circuit includes current supplies, current sinks, input, output and feedback transistors and an inverting gain stage. The negative feedback transistor stabilizes the quiescent signals and enables the magnitude of the amplifier output signal to follow the magnitude of the amplifier input signal. The gain stage, which is connected between the current supplies, the current sinks, and the input and feedback transistors, utilizes undesired signals occurring therein to cancel each other so that the undesired signals do not adversely effect the magnitude of the amplifier output signal.

Abstract: An amplifier includes a network which generates additional output current for driving a substantially capacitive load as the frequency of an input signal is increased. The network comprises a plurality of rate discriminators which activate additional current sources at predetermined frequencies.

Abstract: A bias circuit comprises first and second cascade-connected transistors of the same conductivity type; series-connected diode means adapted to be forward biased by part of a drive current toward the first and second transistors; and means for applying a voltage across a series circuit of the diode means between the bases of the first and second transistors, emitter voltages of the first and second transistors being applied to a next stage class B push-pull circuit.

Abstract: The dynamic input impedance of a feedback current amplifier is varied such that a matching to the characteristic impedance of a line feeding the amplifier is achieved. An integrated negative feedback current amplifier has at least two amplifier stages and one inverse coupling branch from the amplifier input to the amplifier output. The active element of the last amplifier stage has a divided output circuit such that the output current is divided between the inverse coupling branch and the amplifier output. The input DC current is selected such that the dynamic amplifier input impedance is adjusted to the characteristic impedance of a line feeding the amplifier.

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 suitable for use as a video amplifier in a color television circuit for driving the variable impedance load provided by a color television picture tube, in which the load impedance of the amplifier element of the circuit is also made variable. This is achieved, in one embodiment by using as the output stage of the amplifier two transistors with a complementary symmetrical configuration so that one is always substantially cut-off while the other conducts. In another embodiment a transistor in common collector configuration acts as the amplifier element and its emitter from which the output of the amplifier is taken is connected by a diode to the collector of a transistor which feeds the base of the common collector transistor.

Abstract: An active circuit is disclosed including an integrated circuit having at least one amplification stage comprising an FET. At least one negative feedback transistor is provided of the same conduction type as the amplifying transistor, with the drain-to-source path of the negative feedback transistor coupled in series between the drain and gate of the amplifying transistor. At least one biasing transistor of the same conduction type as the amplifying transistor are provided to bias the gate of the negative feedback transistor. The drain of the at least one biasing transistor is connected to a current source furnishing a current having a given ratio to the power supply current of the amplifying transistor. This circuit permits precise control of the small-signal resistance of the feedback transistor.

Abstract: The amplifier comprises at least two amplifier units or transistors T.sub.1 and T.sub.2 of complementary types. The base of the first transistor T.sub.1 is connected to a control current supply line. The emitter of the transistor T.sub.1 is connected on the one hand to one end of the load impedance and on the other hand to the base of the second transistor T.sub.2. The collector of the transistor T.sub.1 is connected to a voltage supply of suitable polarity. The emitter of the transistor T.sub.2 is connected to the current supply line and the collector of said transistor is connected to another end of the load impedance.

Abstract: An integrated circuit degenerative feedback current amplifier has at least two amplifier stages and a degenerative feedback branch connected from the amplifier input to the amplifier output. An active element of the last amplifier stage has its output circuit subdivided in such a way that a subdivision of the output current results whereby a first partial current is guided via the degenerative branch and a second partial current is guided into the amplifier output.

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 voltage controlled variable gain circuit comprising: first, second, third and fourth same polarity transistors for dividing the output current of a first operational amplifier by dc gain control voltage and being connected with the output terminal of the first operational amplifier to which an input signal is applied; means for driving in inverse phase the respective pairs of a first and third transistors, and a second and fourth transistors; a first feedback circuit including a second operational amplifier with an inverting input terminal connected with the output terminal of the first transistor, a first resistor element and a first PN junction element connected in series between the input and output terminals of the second operational amplifier, and a second resistor element and a second PN junction element connected in series between the output of the second operational amplifier and the input terminal of the first operational amplifier, so as to negatively feedback the output current of the first trans

Abstract: The disclosed linear amplifier comprises a grounded N.sup.+ semiconductor substrate on which an N layer is epitaxially grown. The N epitaxial layer includes three separate P diffusion regions. One of the outermost regions is connected to an input terminal and includes an N diffusion region to form an input, common emitter NPN transistor with the epitaxial layer while forming a feedback, common base PNP transistor with the intermediate P diffusion region and epitaxial layer. The remaining P region forms a load, common base PNP transistor with the intermediate P region and epitaxial layer and is connected to an injector terminal. The intermediate P region and N region are connected to an output terminal.

Abstract: A linear output amplifier for a charge coupled device arrangement in which the amplifier has a field effect switching transistor serially connected to a load element, the connection point between the transistor and the load element being the output of the amplifier and the gate terminal of the transistor being the input of the amplifier. The input of the amplifier is connected to the charge coupled device arrangement by either connecting it to the output diffusion zone of the same or by connecting it to a control electrode of the charge coupled device arrangement. Between the output of the amplifier and the input of the amplifier an additional transistor is provided with the aid of which the input can be connected to the output. Preferably, the load element is a field effect transistor and the load resistance which it provides can be varied by connecting a voltage source of desired amplitude to the gate terminal thereof.

Abstract: A fiber optic delay line-controlled oscillator or tuned amplifier. Two embodiments are shown and described, one employing a single solid state active element and the other employing two such elements. The fiber optic delay line or lines employed are combined electronic-to-light transducer(s) supplying the delay line or lines and optical-to-electronic transducer(s) responsive to the optical delay line or lines output(s). That combination provides the tuned or oscillatory feedback path. In one embodiment, a plurality of delay lines are effectively switched into the circuit discretely and selectively in response to a staircase control function.

Abstract: A direct coupled linear amplifier which employs negative feedback to prov accurate and stable gain to AC as well as DC input signals. It also performs the function of a DC level shifter and can therefore be interfaced with a variety of signal sources. A constant current source added to the summing junction of the negative feedback amplifier enables the adjustment of the DC level of the output and the AC gain of the amplifier, completely independently of one another.

Abstract: In the application of analog type circuits to semiconductor chips for large scale circuit integration, a substantial improvement in the size of an amplifier circuit on the chip can be obtained by use of only active components on the chip. The described circuit is designed for any desired amplification factor and this factor can be maintained substantially uniform from chip to chip despite wide variations in the characteristics of comparable components between different semiconductive chips. The analog amplifier includes a high gain operating amplifier and a feedback-input circuit having only active components and which can be designed to reduce the gain of the operating amplifier to any desired value.

Abstract: A so-called charge sensitive amplifier is used as a pre-amplifier for a semiconductor detector. A field-effect transistor (FET) is used as the input stage of the amplifier, wherein the gate terminal of the FET is fed back from the output of the amplifier and the drain terminal of the FET is grounded through a capacitor and connected to a constant current source to make the drain voltage change correspond to the gate potential. The gate potential is self-stabilized.

Abstract: An amplifier having a combination of local series and shunt feedback to provide matched input and output impedances permitting cascading of a number of amplifiers or amplifiers and other devices without signal degradation. .Iadd.