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"That the automobile has practically reached the limit of its development is suggested by the fact that during the past year no improvements of a radical nature have been introduced."
Scientific American ; Jan. 2 edition, 1909
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| Number | Title | Issue Date |
| 7272020 | Isolated, current-fed, pulse width modulation, DC-DC converter A current-fed DC-DC converter has a topology that improves converter performance and operates an input inductor in continuous conduction mode. The configuration and operation of the converter produces reduced requirements for circuit component ratings and leads to f... | 09/18/2007 |
| 7253595 | Low drop-out voltage regulator A low drop-out voltage regulator having a pass device (Mp), an error amplifier (M1-M51) and a double regulation loop including DC feedback loop (R1, R2) and an AC feedback loop (Rf, Cf) including a high pass filter (Cf). Combining these t... | 08/07/2007 |
| 7242229 | Phase locked loop (PLL) and delay locked loop (DLL) counter and delay element programming in user mode A PLL circuit is described. The PLL circuit includes: a signal generator and at least one divider coupled to the signal generator, where the at least one divider is programmable in user mode. In one embodiment, the PLL circuit includes a memory device associated wit... | 07/10/2007 |
| 7141910 | Transconductance circuit for piezoelectric transducer A transconductance monitoring and amplifying circuit for a piezoelectric transducer that may be used in, e.g., a motion detector system includes a FET, with the transducer (and, hence, the signal voltage reference) floating between the gate and source of the FET, as... | 11/28/2006 |
| 7088188 | Differential oscillator The invention relates to a new family of differential oscillators based on oscillator amplifiers with local feedback forming respective local feedback systems, and at least one common link interconnecting the local feedback systems. Each branch of the differential o... | 08/08/2006 |
| 7053725 | 4X crystal frequency multiplier with op amp buffer between 2X multiplier stages A frequency-multiplying circuit generates a multiple of the fundamental frequency of a crystal that oscillates. A first differential multiplier is coupled to the crystal nodes and generates a frequency-doubled output. The frequency-doubled output is applied to an op... | 05/30/2006 |
| 7042251 | Multi-function differential logic gate A fully differential phase and frequency detector utilizes a multi-function differential logic gate to implement a differential AND gate operation and provides a fully differential D-flip-flop. The multi-function differential logic gate has four inputs, which can be... | 05/09/2006 |
| 7002423 | Crystal clock generator operating at third overtone of crystal's fundamental frequency A crystal oscillator operates at the third overtone of the crystal's fundamental frequency. A value of a shunt resistor between the two phase-shift leg nodes is chosen so that the absolute value of the product gm×(Xc1)×(Xc2) is greater than the effec... | 02/21/2006 |
| 6967540 | Synthesizers incorporating parascan TM varactors A synthesizer incorporating voltage tunable capacitors, comprising at least one resonator coupled into a base circuit of a bipolar transistor, the at least one resonator including at least one voltage tunable capacitor; the bipolar transistor including a collector w... | 11/22/2005 |
| 6882236 | Dynamically tuned amplifier for frequency shift keyed signals An amplifier circuit for efficiently driving a tuned resonant load where the amplifier circuit controls the continuously variable resonant frequency of the tuned resonant load so as to match step changes or slower changes in the frequency of the signal with which it... | 04/19/2005 |
| 6300844 | Oscillator starting method The present invention relates to a device for generating a sinewave output signal and comprising an oscillator. The oscillator includes means for respectively connecting and disconnecting one of the device supply voltages, such that when connecting said s... | 10/09/2001 |
| 6169459 | Active-bridge oscillator An active bridge oscillator is formed from a differential amplifier where positive feedback is a function of the impedance of one of the gain elements and a relatively low value common emitter resistance. This use of the nonlinear transistor parameter h s... | 01/02/2001 |
| 5737695 | Method and apparatus for controlling the use of discontinuous transmission in a cellular telephone A method and apparatus for controlling the use of discontinuous transmission in a cellular telephone. The preferred embodiment of the present invention includes a voice activity detector for detecting the presence or absence of speech and an energy detect... | 04/07/1998 |
| 5565821 | Voltage controlled oscillator with improved tuning linearity The object of the invention is a voltage controlled oscillator with improved tuning linearity, which comprises an oscillating transistor (T, 1), a resonator circuit (C11, C12, 11, 12, 19, 20) formed by a capacitance diode (D, 20) and an inductance (L1, 19... | 10/15/1996 |
| 5558800 | Microwave power radiator for microwave heating applications The output matching networks normally included in a microwave power transistor package as well as the transistor combining network therefor are eliminated for heating applications, e.g. microwave ovens. In a preferred embodiment, the transistor dies of fo... | 09/24/1996 |
| 5166579 | Discharge lamp operating circuit The discharge lamp operating circuit comprises two series circuits, each including two switching devices, connected in parallel with the power supply, a series circuit, including a choke coil, a first capacitor, and a parallel circuit with a discharge lam... | 11/24/1992 |
| 5072159 | Lamp driver circuit A lamp driver circuit includes a high voltage secondary winding connectable to a gas discharge lamp. The secondary is wound on a magnetic core together with a pair of primary windings. The primary windings are coupled to one another as well as to an R-C n... | 12/10/1991 |
| 4496914 | Piezo harn self-oscillating drive circuit A circuit is disclosed for driving a piezo ceramic device as used in smoke alarms or other audio warning devices. The circuit detects the resonant frequency of the piezo horn and provides an alternating current at the resonant frequency of the horn for ma... | 01/29/1985 |
| 4272735 | Single amplifier variable gyrator The subject gyrator circuit is realized by a single amplifier and six resistors, which resistors are selected to satisfy a single equation. This permits great flexibility in setting the Z12 and Z21 impedance values without affecting ... | 06/09/1981 |
| 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 |
| 4201957 | Power inverter having parallel switching elements A full wave bridge inverter includes four switch arms, each including N bipolar, parallel transistor switching elements. During a first interval, emitter-collector paths of all transistors in the first and second arms are forward biased so current flows i... | 05/06/1980 |
| 4188593 | RC Oscillator An RC oscillator comprising an amplifier with a first RC voltage divider coupling its output circuit to its non-inverting input circuit and a second RC voltage divider coupling its non-inverting input circuit to its inverting input circuit. The first RC v... | 02/12/1980 |
| 4136315 | Low and high frequency oscillators having common voltage regulator circuit A low frequency modulating signal and a high frequency carrier signal circuit employing a twin-T oscillator having an integrated circuit operational amplifier for producing the modulating signal and an L-C resonant feedback oscillator having a transistor ... | 01/23/1979 |
| 4105957 | Full wave bridge power inverter A full bridge inverter includes four bipolar transistors of like conductivity type, connected in a bridge circuit including an apex to which a load is connected. During a first time interval, emitter collector paths of a first pair of transistors are conn... | 08/08/1978 |
| 4038609 | Replica bridge sensing circuit A replica bridge sensing circuit, comprising an amplifier having inverting and non-inverting inputs, which are symmetrically connected to a generator through a bridge circuit that has replica elements in corresponding branches. Replica elements are define... | 07/26/1977 |
