Abstract: A voltage controlled filter with a plurality of cascaded phase shift circuit stages in a negative feedback path of an amplifier. Each phase shift circuit stage is a RC phase shift network which includes a series capacitor and a field effect transistor (FET) with its source-drain circuit connected as a shunt to ground. The magnitude of the effective source-drain resistance of the FET in each stage is controlled by a DC control voltage which is applied in common to the gate of each FET.

Abstract: A broad band amplifier with negative feedback and controllable amplification factor for use in a carrier frequency system is described. The amplifier is preferably used as a control amplifier in the receiver of a basic group, for example, a basic 60-group of the system wherein the amplification of the amplifier is then controlled by a pilot receiver common for all the 60-groups. The amplifier includes an amplifier stage having constant amplification and which receives the pilot signal. A negative feedback path is connected via a first impedance converter from the output to the input of the amplifier stage. This path includes a capacitive voltage divider together with a second impedance converter and an RC-link. The capacitor values in the voltage divider are varied in dependence on a regulating voltage from the pilot receiver of the system, whereby the degree of negative feedback and thus the amplification of the amplifier can be controlled.

Abstract: A driver circuit in which the output current is limited to a particular value. A very low value resistance in the output stage senses the current and modulates the conduction to a diode-amplifier combination. The combination employs ratioed emitter areas and currents and can respond to potentials at P-N junction contact potential level. The circuit has a dynamic voltage range that extends to within almost the emitter-collector saturation of a single transistor of zero.

Abstract: A field effect transistor amplifier has a signal input circuit which preferably includes an A-class amplifier, a driving stage having first and second FETs driven in the same phase relation by an input signal applied to their gate electrodes from the signal input circuit, a first voltage source connected to the source electrodes of the first and second FETs, a resistor connected between the drain electrodes of the first and second FETs, an output stage having third and fourth FETs with the gate electrodes of the latter being connected to opposite ends of the resistor so that the voltage across the latter is applied as the DC bias voltage for the FETs of the output stage, a second voltage source connected to the drain electrodes of the third and fourth FETs, and an output terminal connected to the source electrodes of the third and fourth electrodes which are connected to each other.

Abstract: A signal amplifying circuit including an amplifying transistor having its base-emitter terminals connected to a signal source. A diode having the proper characteristics is also connected across the base-emitter input terminals to produce a first reference bias voltage to be applied to the input circuit of the transistor. The emitter-collector circuit of a compensating transistor is connected in series with the emitter-collector circuit of the amplifying transistor, and a second reference bias voltage is connected between the base of the compensating transistor and the emitter of the amplifying transistor. The second reference bias voltage is produced across a plurality of diodes having the proper characteristics, whereby the current gain of the amplifier will be constant regardless of variations in the transistor characteristics.

Abstract: A flat type display tube has an exhaust tube extending outward in a plane of the surface of the substrate and a plurality of current supply lead-in strips. The exhaust tube and lead-in strips extend in the same direction from a body of the display tube. The lead-in strip is bent partway in a position short of the exhaust tube and in a direction substantially vertical to the plane of the surface of the substrate.

Abstract: An integratable bias circuit for semiconductor junction diodes of the type exhibiting junction capacitance when reverse biased by suitable applied voltages includes a source of fixed bias reference voltage applied to the diode junction. The reference voltage is selected less than the reverse conduction breakdown voltage of the diode junction to prevent diode operation beyond its reverse breakdown potential while also reliably determining the junction capacitance.

Abstract: In a pyroelectric vidicon, the target is covered with a layer of vacuum compatible material which has a high secondary emission coefficient, a low first cross-over and low conductivity to prevent decomposition of the target.

Abstract: An input amplifier stage for a microphone which includes a transistor having a load circuit including a load resistor and an emitter resistor. In a preferred embodiment, using a transistor of the NPN type, a volume control potentiometer is provided having a first terminal which is coupled to the emitter and a second terminal which is coupled to the output of the stage, with the wiper being grounded so that (a) when the wiper is adjacent the emitter, the emitter resistor is effectively shunted by low resistance thereby increasing the gain of the transistor stage while leaving the output terminal substantially free of shunting effect for maximizing the output signal, and so that (b) when the wiper is adjacent the output terminal, the stage output terminal is effectively shunted by a low resistance while leaving the emitter resistor substantially free of shunting effect for decreasing the gain of the stage and minimizing the output signal.

Abstract: A high-reliability power amplifier employs passive automatic switching between parallel amplifier channels to provide a constant output power level, which is independent of the failure of an individual channel. The reliability of the amplifier network is improved by amplifying the input signal through parallel channels. Passive switching between channels and a constant level of power output are provided through a hybrid junction.

Abstract: The low-cost lighting control apparatus for high-pressure discharge lamps utilizing an ON-OFF photocoupler to provide isolation between the relatively high voltage AC supplied to the lamp load and the relatively low voltage DC control circuitry. Preferably, the apparatus is current-feedback stabilized utilizing a feedback resistor.

Abstract: A gain controllable amplifier of the present invention comprises a first and a second differential amplifier. The first differential amplifier serves as an amplifier for an input signal to be impressed on emitters connected in common with each other, while the second differential amplifier serves as a base bias voltage control circuit of the first differential amplifier. The bias voltage derived from the second differential amplifier is changed by a D.C. bias voltage applied to the bases of the respective transistors in the second differential amplifier. The connected to the respective output terminals of the second differential amplifier are transistors whose bases receive a constant voltage. The gain of the first differential amplifier can be controlled by adjusting the D.C. bias voltage applied to the second differential amplifier. The present invention further comprises two current supply circuit each connected to the aforesaid respective output terminals of the second differential amplifier.

Abstract: An amplifier arrangement with a first input circuit and an output circuit, which output circuit is constituted by the series connection of the collector-emitter path of a first transistor and a diode, while the first input circuit is constituted by the series connection of a second diode and the collector-emitter path of a second transistor, whose base-emitter junction is shunted by the first diode. A second input circuit is obtained in that an input connection point is connected to the base of the second transistor. The amplifier arrangement comprises a second output circuit, which is constituted by the collector-emitter path of a third transistor, whose base is connected to the collector of the second transistor. An important application of said amplifier arrangement is as a high-frequency driver stage for a class-B push-pull output stage.

Abstract: A broadband Impatt diode amplifier for microstrip includes a two-section quarter wavelength impedance transformer. Since the width of one transformer section exceeds a half wavelength, spurious mode resonance is suppressed using a longitudinal slot with an absorbing resistor or by offsetting the transformer sections. A compact configuration combines the power of two microwave diodes over a broad frequency range.

Abstract: A monolitic transistor amplifier includes a negative feedback network between the output stage and an input stage. The network comprises one or more resistive voltage divider L-link with shunt elements which have a higher temperature coefficient than its series elements. The shunt elements have resistors which are in close thermal contact with the output transistor causing the negative feedback to increase with the current passing the output transistor. The shunt resistors are formed in the collector diffusion giving them a temperature coefficient of 3.5%/.degree. C.

Abstract: Spectral output of lamp is controlled by a combination of color filters and dual photocell which monitors the spectral composition of the radiant energy from the lamp and compensates for change therein by automatically varying the power applied to the lamp to provide constant spectral output.

Abstract: A cascode type transistor amplifier circuit having an improved signal-to-noise ratio characteristic, wherein a parallel circuit which consists of a resistance of comparatively large value and a diode is disposed on the emitter side of one of a pair of differential transistors and wherein a variable absorption current circuit is disposed on the emitter side of a grounded-emitter amplifying transistor, the absorption current of the variable absorption current circuit being controlled so as to decrease with increase in the input signal level.

Abstract: Unity current gain impedance transformation at the input of a field effect transistor current mirror amplifier reduces the input impedance and renders it independent of the mirror ratio. A net saving of semiconductor material may be obtained for a given mirror ratio and input impedance when the transformation is provided by a common gate connected complementary field effect transistor meeting certain effective threshold voltage and forward transfer conductance ratio requirements.

Abstract: Current mirror amplifiers, each using a field-effect transistor as a source follower to provide collector-to-base feedback to a first bipolar transistor to condition its collector-to-emitter path to accept an input current. A second bipolar transistor has its base-emitter circuit parallelled with base-emitter circuit of the first bipolar transistor which conditions the collector-to-emitter path of the second bipolar transistor to conduct an output current proportionally related to that in the collector-to-emitter path of the first bipolar transistor. Since the source follower supplies the base currents of the bipolar transistors without requiring any gate current, the ratio of the input to output currents is constant regardless of the current gain of the bipolar transistors.

Abstract: This invention relates to a neutron generator and a method for the production of 14 MeV neutrons. Heavy ions are accelerated to impinge upon a target mixture of deuterium and tritium to produce recoil atoms of deuterium and tritium. These recoil atoms have a sufficient energy such that they interact with other atoms of tritium or deuterium in the target mixture to produce approximately 14 MeV neutrons.