A method and apparatus for efficient power amplification over a wide dynamic range and for a number of modulation formats includes a carrier amplifier (30) and a peaking amplifier (40). The carrier amplifier (30) operates with a bias generated by an envelope amplifier (80) which amplifies the envelope of an input signal as generated by an envelope detector (70). The peaking amplifier (40) operates with a fixed bias. The outputs of the carrier amplifier (30) and the peaking amplifier (40) are com...

A ballast circuit for a mercury halide discharge lamp comprises a bridge rectifier providing a path between input and output terminals of the ballast circuit, and includes at least one electronic voltage doubling or tripling circuit providing a second path between the input and output terminals. The voltage doubling or tripling circuit contains a capacitance which is sufficiently high to effect during starting ionization of the starting gas and establish a state of conduction in the discharge la...

In a color cathode ray tube having a display screen assembled of a plurality of triplets of green, red and blue strips, the distance between the centers of two adjacent strips belonging to the same triplet is at either side of the red strip at least 5% larger than the distance between the centers of two adjacent strips of which one belongs to the triplet and the other belongs to an adjacent triplet.

In a system which continuously measures the composition, position or size of materials, the probe has a guard shield which is effective for continuous measurement. The measurement system includes a zero adjusting impedance connected with the variable probe impedance as two adjacent arms of a balanceable bridge. A span impedance is connected between the junction of the adjacent arms and a low impedance AC source. The buffer amplifier has its input connected across the span impedance so that chang...

An improved low-pass multistage active filter circuit manufactured from monolithic and hybrid circuits is provided having a plurality of cascaded amplifier stages coupled to one another through filter sections and having an external DC negative feedback loop comprising a feedback resistor connected between the output of the lastcascaded amplifier and inverting input of the first of the cascaded amplifiers, and which feedback resistor substantially matches in resistance value the D.C. component v...

Apparatus for starting and operating a gas discharge tube comprising a glow discharge starter connected to preheatable electrodes of the tube. An auxiliary circuit including a thyristor produces a voltage to ignite the glow discharge starter which then provides a path to heat the tube electrodes and subsequently aids in generating a voltage peak to ignite the discharge tube. The ignition voltage of the glow discharge starter is chosen to be higher than the AC supply voltage but lower than the vo...

An electric discharge lamp with an ion reservoir to which a DC voltage of reversible polarity is applied so that the gas pressure within the lamp can be easily increased or decreased. By using several ionizable materials in the lamp, the color of the emitted light can be changed by adding or removing one of said materials.

For direct separation of primary colors of an imaged scene to be televised, a silicon target structure has on the light-receiving surface thereof an array of groups of picture elements doped with donor and acceptor impurities to give specific sensitivities to the incident light. On the electron-beam surface thereof an array of p-n junctions is formed in correspondence with the array on the light-receiving surface. Minority carriers induced by the shorter wavelength range of the spectrum are repe...

The differential amplifier current folder and coder circuit of the present invention is dynamically biased in accordance with the magnitude of the input signal to the differential amplifier. The biasing current through the main coding paths of the folder circuitry is thus reduced for lower magnitude input signals, and the coding error introduced due to resistor variations (i.e., I.DELTA.R voltage drops) and transistor base currents varies in accordance with the magnitude of the input signal rath...

A color display device includes a substrate which forms a partition wall for defining a vacuum space, a plurality of cathode protrusions effecting field emission are formed on the substrate, and a transparent insulator which forms the vacuum space along with the substrate. A plurality of phosphor dots are formed on the surface of the transparent insulator on the side of the vacuum space, are arranged in opposition to the electron sources and have mutually different colors of light emission. Anod...