Abstract: In an output signal level control circuit, a level adjusting section receives an input signal to adjust the input signal in level in response to a level control signal. A branching circuit branches a portion of the input signal adjusted in level by the level adjusting section to produce a branched signal. A detecting section includes the first and second detecting sections and generates a detection resultant signal based on a first detection result of the branched signal by the first detecting section and a second detection result of the branch signal by the second detecting section. The first and second detecting sections are operable at a same time. A control signal generating unit generates the level control signal based on the detection resultant signal to output to the level adjusting section.

Abstract: A voltage Vdd-Vee amplified by a differential amplification circuit is provided to a common mode feedback circuit which controls an average potential of the Vdd and Vee to be constant by controlling a gate potential of an E-FET and to a level shift & common mode feedback circuit which controls an average potential of VDD and VBB to be constant by controlling a current mirror circuit having E-FETs via resistors and a diode. Output voltage VAA-VBB is used as an source & input voltage of a voltage controlled oscillator in a PLL circuit using a high frequency. Instead of the level shift & common mode feedback circuit, a differential offset circuit can be used with a pair of current being approximately equal to each other.

Abstract: A cooling arrangement for a high speed open rotor reluctance motor/generator apparatus of the type finding combination use in aircraft applications for engine starting and electrical energy generation in both normal and auxiliary power unit operating conditions. The cooling arrangement identifies fluid flow alternatives which include inlet region redirection of coolant fluid to improve its induction into rotor interpolar space, rotor movement-induced centrifugal pressurizing of coolant using simple and more complex structural elements, machine heating of the coolant fluid, kinetic energy extraction from heated moving coolant fluid and combinations of these arrangements in particular machine configurations. Use of the invention under extremes of machine energy levels and self heating in military and commercial aircraft environments are contemplated.

Abstract: A radially combined RF/Microwave amplifier includes an input divider for dividing the input power signal into "N" input signals, and a single matching/combiner circuit configuration for matching an combining the amplified "N" input signals into one combined output power signal P.sub.T. The system utilizes a stripline/microstrip configuration of the matching/combiner circuitry and suspends this circuitry above one surface of an aluminum chill plate. The input stage of the amplifier is disposed on the opposite surface of the chill plate with the transistors connecting the input stage with the output network across the peripheral edge of the chill plate.

Abstract: An automatic gain controller controls the gain of a variable-gain amplifier based on an error signal which is corrected by a correction controller using discrete characteristic data which are sampled from a gain control characteristic of the variable-gain amplifier in sampling steps each being set depending on a variation of the gain control characteristic. The correction controller corrects the error signal based on continuous characteristic data generated from the discrete characteristic data stored in the memory so that the gain control characteristic of the variable-gain amplifier is substantially linear with respect to the error signal.

Abstract: An electric generator assembly for supplying power to electrical devices on a bicycle. The electrical generator assembly includes a gearwheel fixedly secured and rotatively coupled to a bicycle wheel proximate a hub axis of the bicycle wheel, a rotor housing, an annular stator disposed within the rotor housing, and a rotor disposed concentrically within the annular stator. The electric generator assembly further includes an arm extending from the rotor housing and configured for detachable attachment with a portion of the bicycle frame proximate the hub axis of the bicycle wheel. The rotor is driven by a rotor-driving gear disposed outside the rotor housing. The rotor-driving gear is configured to mesh with an output gear of a gear train for transmitting power from the bicycle wheel. An input pinion, configured to mesh with the gearwheel, is rotatively coupled to the input gear of the gear train.

Abstract: The application describes an electric motor with a pressure compensation device. This device consists of a BTFE membrane that is arranged in a connecting channel between the interior of the electric motor and the external air.The membrane is arranged in the shield of the electric motor. Since the shield consists of plastic, the membrane can be sprayed on during the manufacture of the shield such that the membrane is inseparably connected to the shield. However, other fastening methods can be considered. One particularly suitable location for arranging the membrane is a circumferential collar that serves for centering the housing relative to the motor shaft. The connecting channel is realized in the form of a slot on the outer side of the collar. The application also describes additional methods for attaching the membrane.

Abstract: An improved design brushless DC motor has a rotating disk type rotor with trapezoidal shaped permanent magnets connected by a closed magnetic circuit and a stator mounted inside the motor coaxially with the rotor and also having ttrapezoidal shaped stator coils located in the magnetic field generated by the permanent magnets of the rotor. The active parts of the stator coil windings are oriented in a radial direction and are configured to have a width equal to between 0.2 and up to 0.4 of the pole pitch length with the angle between two radiuses which pass through the center of the active part of each coil equal to 360/n (where "n" is the number of magnets). In addition--one or both base lines of each trapezoid is perpendicular to the disk radius and is between 0.7 and up to 0.9 of the pole pitch length. The rotor of the motor comprises three parallel disks and the stator two stator windings with each stator winding positioned between the external and internal disks.

Abstract: This invention is for an improvement in amplifiers resulting in ultra low distortion.

Abstract: A power interface circuit (64) is provided that uses an n-channel MOSFET (66) to control the switching of a power supply (46) to a TDMA power amplifier (58). When turned on, the n-channel MOSFET (66) connects the power supply (46) to the power amplifier (58), and when turned off, it disconnects the power supply from the power amplifier. The power interface circuit (64) includes a switch control circuit (70) that controls the switching state of the n-channel MOSFET (66) in response to a switch control signal. The switch control signal has a first binary state during which the n-channel MOSFET (66) is turned off and a second binary state during which the n-channel MOSFET is turned on.

Abstract: The envelope-dependency of the distortion-introducing behavior of an RF power amplifier is used to derive a predistortion signal, that is derived from a plurality of respectively different work function representative signals. Each work function signal, in turn, is based upon the envelope of the input signal to the RF power amplifier. Prior to being combined into a predistortion control signal, each work function signal is controllably weighted in accordance with an error measurement comparison of the amplifier input signal with the amplifier output signal. The error measurement function yields a measure of the error contained in the-amplifier output signal, and drives a weight adjustment control mechanism, which controllably varies a set of weights for each of in-phase and quadrature components of the respectively different signal functions, in such a manner as to minimize the measured error.

Abstract: A linear power amplifier having a pulse density modulated switching power supply including a power supply providing at least a relatively high DC voltage output; a voltage amplifier connected to an external signal source to amplify a relatively low voltage signal received from the external signal source into a relatively high voltage signal; a current amplifier connected to the voltage amplifier to increase the current flow associated with the relatively high voltage signal, as needed, in order to properly drive a load, wherein the current amplifier is powered by a pulse generator. The pulse generator is connected to a first line carrying the relatively high voltage signal to the load, and to a second line supplying power to the current amplifier.

Abstract: A limiter for a solid state power amplifier (SSPA) protects the amplifier against large peak, short duration noise signals while controlling drive level related phase shifts. The limiter limits noise signals to a safe input level for the power output section of the SSPA. It also uses a pair of resistor networks at its input and output to dampen reflected energy and thus control drive level related phase shifts.

Abstract: A drain terminal of a first N-channel MOS transistor is connected to an output side of a first current mirror input current via a voltage drop device, a first current mirror input current is supplied to the gate terminals of first, third, and fifth N-channel MOS transistors, and a second current mirror input current is supplied to the gate terminals of second and fourth N-channel MOS transistors.

Abstract: A current boost circuit includes: a first transistor M.sub.10 having a gate coupled to an input node; a second transistor M.sub.11 ; a first capacitance C.sub.C3 coupled between a gate of the second transistor M.sub.11 and a drain of the first transistor M.sub.10 ; a third transistor M.sub.17 having a gate coupled to a drain of the second transistor M.sub.11 ; and a second capacitance C.sub.C1 coupled between the drain of the second transistor M.sub.11 and a drain of the third transistor M.sub.17.

Abstract: A reluctance machine including a plurality of phase windings where each phase winding comprises a plurality of fractional-pitched coils. The reluctance machine may be coupled to a drive that can energize one, two or more of the phase windings to provide output torque that is derived from: (i) the self-inductances of the phase windings; (ii) a combination of the self inductances of the phase windings and the mutual inductances between the phase windings; or (iii) the mutual inductances between the phase windings.

Abstract: A multi-stage differential amplifier includes first and second DC current paths with first and second stage amplification transistors included in each current path so that both stages share the same DC bias current. In one embodiment, an automatic gain control circuits are included in the second stage to control gain and maintain low noise figure.

Abstract: A continuous cardiac output monitor a general-purpose monitoring console with local display and communication facilities, and a module removably interfacing with the console to configure the latter for performing continuous cardiac output monitoring. The module includes a switch-mode high efficiency power amplifier for providing electrical heating power at a selected voltage, frequency, and wave form to a heating element of a continuous cardiac output monitoring catheter, which catheter at a distal end portion thereof is immersed in the blood flow of a patient. The catheter effects a temperature transient in the patient's blood flow by the controlled application of electrical resistance heating utilizing electrical power from the power amplifier, and this temperature transient is sensed and used to derive a value for the patient's cardiac output.

Abstract: A tuned amplifier that can be produced easily in an integrated circuit and by which the tuning frequency and the maximum damping are arbitrarily adjusted without mutual interference.

Abstract: A differential amplifier receiving a first input signal and a second input signal, respectively, and amplifying voltage difference between the first and second input signals to output an output signal includes a first source follower circuit receiving an external data signal as the first input signal, and having an output node; a second source following circuit having a constant current source FET and receiving a reference voltage as the second input signal; and a bias circuit providing a signal having the same phase as the data signal from the output node of the first source follower circuit and inputting that signal to a gate terminal of the constant current source FET of the second source follower circuit.