Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7315220 | Voltage controlled oscillator A voltage controlled oscillator (VCO) having a single stage ring-oscillator having both coarse and fine control of the frequency of oscillation is described. In an embodiment the VCO may include a first n-channel latch having a first output and a second output; a fi... | 01/01/2008 |
| 7119627 | Phase-locked loop circuit as well as a voltage-controlled oscillator as used in a phase-locked loop circuit A phase-locked loop circuit comprises a voltage-controlled oscillator with at least one resonator circuit for driving the oscillator to an output frequency which is a multiple of the resonator frequency. The voltage-controlled oscillator is connected to a phase-lock... | 10/10/2006 |
| 7079013 | Device for the inductive transmission of energy and/or data The device has a primary circuit (1) that transmits energy or data via an intermediate circuit (2) to a secondary circuit (3) by means of induction. The intermediate circuit (2) has a very low quality factor. The inductive coupling betwee... | 07/18/2006 |
| 6946924 | Low noise voltage controlled oscillator A voltage controlled oscillator, comprising a pair of transistors connected to a tank circuit, said tank circuit including a plurality of tuning diodes connected in parallel with an inductor, said tuning diodes having cathodes connected to a common connection. ... | 09/20/2005 |
| 6940356 | Circuitry to reduce PLL lock acquisition time A phase locked loop, PLL, is described with multiple parallel charge pumps that are selectively disabled as phase lock is approached. A lock detection circuit is described that enabled reference currents to be fed to the parallel charge pumps. The error signal from ... | 09/06/2005 |
| 6611148 | Apparatus for the high voltage testing of insulated conductors and oscillator circuit for use with same An insulation tester and oscillator circuit for use in same includes a transformer including a primary winding and at least one secondary winding to be coupled across an external load such as an electrode. First and second bipolar junction transistors are... | 08/26/2003 |
| 6608488 | Apparatus for high voltage testing of insulated conductors and oscillator circuit for use with same An insulation tester and oscillator circuit for use in same includes a transformer including a primary winding and at least one secondary winding to be coupled across an external load such as an electrode. First and second bipolar junction transistors are... | 08/19/2003 |
| 6429748 | Oscillation circuits featuring coaxial resonators There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to double the effective frequency of a ceramic coaxial resonator is to couple ... | 08/06/2002 |
| 6326854 | Coaxial resonator and oscillation circuits featuring coaxial resonators There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to double the effective frequency of a ceramic coaxial resonator is to couple ... | 12/04/2001 |
| 6297707 | Microwave oscillator with dielectric resonator A microwave oscillator includes at least two active components and a dielectric resonator. The coupling between each active component and the dielectric resonator is of the transmission type and the inputs of neighboring active components are connected to... | 10/02/2001 |
| 6275118 | Push-push oscillator A push--push oscillator is formed by (a) a resonator circuit including a transmission line having one-half wavelength and both ends of the line being left open, and a capacitance for frequency control coupled to the transmission line in parallel, and (b) ... | 08/14/2001 |
| 6169461 | High-frequency oscillating circuit A high-frequency oscillating circuit that is not degraded by external electromagnetic interference. The high-frequency oscillating circuit includes first and second oscillating transistors wherein the bases are connected together directly or via a capacit... | 01/02/2001 |
| 5859572 | Oscillator and transmitter arrangement for power specific applications having parasitic impedances A transmitter system for transmitting an output signal having an output level and a signal to noise ratio. The transmitter system comprises a balanced oscillator comprised of a resonator for generating a reference signal, and for creating a parasitic impe... | 01/12/1999 |
| 5754012 | Primary side lamp current sensing for minature cold cathode fluorescent lamp system A circuit for sensing a current in a fluorescent lamp. A control system comprises a buck regulator circuit for supplying a buck current, an inverter circuit for receiving the buck current and for generating a lamp voltage, a circuit for sensing a current ... | 05/19/1998 |
| 5699021 | Balanced and buffered oscillator and transmitter arrangement A balanced and buffered oscillator and transmitter arrangement includes a first and second oscillator, each of which include a resonator for generating a reference signal, an amplifier for amplifying the reference signal, a resonant tank for generating an... | 12/16/1997 |
| 5602515 | High-frequency generator with harmonic-tuned resonant circuits In order to improve the efficiency of a self-starting high-frequency generator, where for self-starting power is fed back from the anode circuit to the control grid of the grid-controlled electron tube used as amplifier element, the following measures are... | 02/11/1997 |
| 5568095 | Balanced oscillator and transmitter arrangement The present invention teaches an oscillator and transmitter. The balanced oscillator comprises a resonator for generating a reference signal having a resonating frequency, a first oscillator for providing a first oscillating output in response to the reso... | 10/22/1996 |
| 5486793 | Balanced RF oscillator and transmitter A balanced oscillator and transmitter circuit is provided which includes a pair of balanced Colpitts-type oscillators for generating an enhanced power radiating output signal. The balanced oscillators share a series resonance input tank. Each oscillator h... | 01/23/1996 |
| 5422605 | Low-noise push-pull crystal oscillator A low phase noise oscillator 10 having a balanced feedback transformer 24 and a push-pull resonant circuit 12 for generating an oscillation excitation signal. The resonant circuit 12 is loaded by an output buffer 20 connected between first and second feed... | 06/06/1995 |
| 5402087 | Voltage controlled push-push oscillator A voltage controlled push-push oscillator is provided having a variable frequency output over a range of frequencies. Usually, the range of frequencies is in the microwave range. The configuration is such that the collectors of a pair of transistors are t... | 03/28/1995 |
| 5309350 | Push-pull inverter Here is disclosed a push-pull inverter used to drive a cold cathode discharge tube, a hot cathode discharge tube and the like, comprising a boosting transformer having a first primary coil, a first secondary coil, a second primary coil and a second second... | 05/03/1994 |
| 5289139 | Push-push ring resonator oscillator A push-push microwave oscillator has two branch oscillators fabricated of a transistor and transmission line elements extending from terminals of the transistor, and a resonator which is fabricated of an annulus of superconductor material and serves to ph... | 02/22/1994 |
| 5250910 | Push-push oscillator having in-phase and anti-phase output combining circuits A push-push oscillator including a resonator having a transmission line and a capacitance connected to the transmission line in parallel; an oscillating circuit responsive to the resonator for oscillating and for producing first and second outputs having ... | 10/05/1993 |
| 5109328 | Push-pull inverter employing current feedback This invention relates to a push-pull inverter used, for example, as a driver for cold-cathod discharge tube, hot-cathode discharge tube, etc. According to this invention, respective control electrodes of a first switching element and a second switching elemen... | 04/28/1992 |
| 4996499 | Amplitude stabilized oscillator amplifier An inverting amplifier useful in an oscillator circuit includes complementary serially connected first and second metal-oxide-semiconductor field effort transistor (MOSFETS) and first and second resistors, two capacitors, a first feedback circuit having t... | 02/26/1991 |
| 4947139 | Very low input power oscillator with improved amplitude stability An improved control circuit for maintaining constant amplitude of the sinusoidal output signal of an oscillator circuit by synchronously demodulating the signal using a push-pull transistor pair operating in saturation to generate a control signal for com... | 08/07/1990 |
| 4818953 | Oscillator improvement An improved oscillator circuit for avoiding core saturation without the need for auxiliary magnetic devices employs an emitter resistance for regulating base voltage, and a semiconductor base shunt for initiating transistor cut-off when the base voltage i... | 04/04/1989 |
| 4763084 | Push-push dielectric resonator oscillator A push-push broadband dielectric resonator oscillator circuit that operates in the K and Ka band frequency range has two oscillator circuits that oscillate at the same fundamental frequency. An antiphaseal relationship is maintained between the two oscill... | 08/09/1988 |
| 4704585 | Rapid frequency synthesizer apparatus and method Rapid frequency synthesizer apparatus, particularly for use in high speed frequency hooping systems, includes a voltage controlled oscillator (VCO) and a memory in which are stored digital control voltage commands corresponding to the various frequencies ... | 11/03/1987 |
| 4704561 | Push-pull generator A push-pull generator with a driver stage and a push-pull output stage. A parallel connection of a resistor (R3, R4) with a control transistor (T3, T4) is provided in the base line of each output stage transistor. In the push-pull output stage, resistors ... | 11/03/1987 |
| 4532439 | Mosfet logical circuit with increased noise margin A logic circuit comprises a first and second circuit. The first circuit consists of at least one first conductivity-type MOSFET having a gate connected to an input terminal, and having a first current path connected at one end to an output terminal. The s... | 07/30/1985 |
| 4527130 | Push-pull microwave oscillator with fundamental and second harmonic outputs A push-pull microwave oscillator circuit, including two transistors, for producing the second harmonic of a fundamental frequency at a symmetry point of the circuit which is connected to the bases of the transistors through identical arrangements of circu... | 07/02/1985 |
| 4513226 | Electronic ballast-inverter circuit An electronic ballast-inverter circuit for powering one or more fluorescent lamps or the like includes two identical circuits operating at different DC offsets, each circuit including a tank circuit composed of a primary winding of the power transformer a... | 04/23/1985 |
| 4453269 | Apparatus for improving the frequency stability of a transmitter oscillator circuit A novel apparatus and method for improving the stability of an electrical circuit such as an oscillator and/or a radio frequency transmitter which is coupled to a radiating element wherein the radiating element such as a loop is coupled to the inductor or... | 06/05/1984 |
| 4434457 | Nonsaturating electronic ballast for gas discharge tubes A solid-state power generator or inverter for operating a load such as one or more gas discharge lamps from a DC or rectified AC power source includes two principal circuits, one being a drive circuit with pulse formation derived by negative feedback and ... | 02/28/1984 |
| 4360790 | Varactor controlled push-pull oscillator An oscillator arrangement is disclosed which is controllable in its frequency and which comprises a control input for frequency variation and a transformer output, whose frequency-determining oscillating circuit possesses, as a controllable reactive eleme... | 11/23/1982 |
| 4336509 | Oscillation generator for an ultrasonic liquid atomizer The oscillation generator includes an oscillator circuit, a push-pull amplifier with inductive positive feedback connected in the circuit, a piezoceramic atomizer vibrator element, and a load-dependent regenerative feedback coupling connected to the circu... | 06/22/1982 |
| 4277726 | Solid-state ballast for rapid-start type fluorescent lamps A novel transistorized fluorescent lamp ballast and lamp combination operates from AC line voltage. The ballast provides for "soft-start" lamp operation in one featured aspect and provides for some lamp light output regulation in another featured aspect t... | 07/07/1981 |
| 4258337 | Stabilized output power oscillator The oscillator includes a high gain differential amplifier, the output of which alternately drives two sets of transistors which together provide the oscillator output signal. A first set of transistors operates during one-half cycle of the output while t... | 03/24/1981 |
| 4211985 | Crystal oscillator using a class B complementary MIS amplifier In oscillators such as those used in electronic watches, low power consumption is quite desirable. To accomplish this, an oscillator is provided including a complementary inverter amplifier circuit comprising a complementary inverter including a p-channel... | 07/08/1980 |
