Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7199577 | Characterizing multiple DC supplies decoupling capacitors in PCB by anti-resonant frequencies Methods and systems formulate the impedance for decoupling capacitors of a multiple power supply printed circuit board considering plane capacitance, series resonant frequencies, parallel resonant frequencies and impedance. The impedances are evaluated at anti-reson... | 04/03/2007 |
| 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 |
| 6504436 | Transconductance tuning circuit with independent frequency and amplitude control A tuning circuit includes an oscillator that receives an oscillating input signal and a control signal, and generates an oscillating output signal. The control signal is obtained from a frequency control circuit that compares the phases of the oscillating... | 01/07/2003 |
| 6472945 | Operational amplifier oscillator An operational amplifier oscillator uses an operational amplifier as a low impedance driver for a resonator, the output from the operational amplifier being a voltage signal at the desired frequency. The operational amplifier has positive and negative fee... | 10/29/2002 |
| 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 |
| 4794350 | Circuit arrangement for converting a resistance variation into a frequency variation A simple circuit for converting the resistance variations of a strain gauge measuring bridge into a frequency variation of an oscillator. The circuit includes first and second phase shift circuits connected in cascade in a feedback loop with a frequency-i... | 12/27/1988 |
| 4604898 | Pressure measuring device A device is provided comprising a circuit using the properties of a resonating cavity sensor whose resonance frequency is modified by the electric capacity variations due to the mechanical deformation of a wall under the effect of the pressure to be measu... | 08/12/1986 |
| 4542353 | Sine wave generator A sine wave generator circuit for providing, as its output, a substantially perfect sine wave signal includes a multiplier responsive to first input and second input signals of varying magnitude for providing as its output the sine wave signal as a functi... | 09/17/1985 |
| 4417220 | Adjustable and selective electrical filters and methods of tuning them A notch filter is provided with an ancillary circuit including a non-inverting amplifier and a coupling which enables the filter to form part of an oscillatory loop of which the frequency of oscillation corresponds to the frequency of maximum rejection by... | 11/22/1983 |
| 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 |
| 4006430 | Circuit arrangement for converting a bridge unbalance into a frequency variation The bridge unbalance of a measuring bridge including a measuring transducer is converted into a frequency variation of an RC-oscillator. Since measuring transducers often have characteristics which are not exactly linear, such a conversion, which exactly ... | 02/01/1977 |
