Class 331/166 - With keying means of the active element type (e.g., burst generator)

Subclass of Class 331 - Oscillators
Definition: Shock excited resonant circuits wherein a space discharge
No. of patents: 19
Last issue date: 02/23/2010

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Number	Title	Issue Date
7667548	Oscillation maintenance circuit for half duplex transponder An oscillation maintenance circuit for a half-duplex transponder that has an LC resonant circuit, a storage capacitor and a rectifier connected to charge the storage capacitor with a rectified oscillation signal, having an end-of-burst detector providing an end-of-b...	02/23/2010
7202712	Multiphase resonant pulse generators A multiphase resonant pulse generator (74) has N groups of N−1 switches (44,46,48) which, when activated, form N paths from a power supply (Vdc) to ground or a reference voltage. Here N is a positive integer greater than 2. Each of the paths includes...	04/10/2007
7203609	Magnetic field generating apparatus and magnetic field controlling method When a sine wave is supplied from a sine wave oscillator through a resonant capacitor selection circuit, an alternating electric and magnetic field is generated on a loop coil. A magnetic intensity detection coil supplies an electromagnetic field signal to a control...	04/10/2007
7151914	Transmitter system for wireless communication with implanted devices A transmitter system for wireless communication with implanted medical devices includes a transmitter circuit having a resonant network the resonant frequency of which is adjusted by a feedback circuit in order to minimize the current drain from the power source and...	12/19/2006
7005935	Switched reactance modulated E-class oscillator A modulated Class E oscillator. In one embodiment, the modulated Class E oscillator may achieve high coil currents (about 1A) and voltages (about 500V) with low power components. Current may be injected when the oscillating current in the inductor passes through zer...	02/28/2006
6864755	Switched reactance modulated E-class oscillator design A modulated Class E transmitter is disclosed. In one embodiment of the invention, the modulated Class E oscillator achieves high coil currents (˜1A) and voltages (˜500V) with low power components by precisely timed injection of current when the oscillating current...	03/08/2005
6806783	Circuit assembly for generating RF oscillation plucking pulses In a circuit assembly for generating pulses sustaining or “plucking” RF oscillations in a resonant circuit (12) of transponder (10) having no battery power supply in which the supply voltage needed for its operation is obtained from a RF carrier os...	10/19/2004
6762561	Radio frequency resonator An apparatus having a radio frequency resonator, which has a coil, a capacitor means and at least one switch means being associated with another capacitor means, a resistor means and a high voltage supply means, one end of the switch means being connected to a junct...	07/13/2004
5942953	Oscillation circuit driven alternately by two different square wave periodic signals having different half cycle durations A circuit arrangement is provided with a controlled switch which is controlled by means of a periodic switching signal for operating an oscillation circuit at a frequency f, and with a control circuit for generating the periodic switching signal. The cont...	08/24/1999
5235142	Phase reference system for cordless looping digitizer In a cordless, electro-magnetic digitizing system having a drive circuit outputting a square wave drive signal of known initial polarity to a transducer coil in a cursor to oscillate the transducer coil and cause a magnetic field output therefrom which is...	08/10/1993
5227740	Oscillation maintenance circuit A circuit arrangement is described with the aid of which a control signal can be generated in dependence upon the occurrence of an extreme value of a sinusoidal oscillation. The circuit arrangement (10) includes a storage member (22) which is adapted to b...	07/13/1993
5170414	Adjustable output level signal transmitter An adjustable output level transmitter includes a direct current energy source, an L-C tank circuit and a switching means for sequentially coupling the capacitors of the tank circuit to the direct current energy source and ground. The output signal freque...	12/08/1992
5010307	Oscillator having periodically pulsed crystal An oscillator circuit for use with a supply line and a line at a reference potential includes a crystal and a switching stage, the switching stage being closeable to connect the crystal to the supply line via one terminal of the crystal. The other termina...	04/23/1991
4972438	Self-oscillating transmitter A device for use as a self-oscillating Class D transmitter is disclosed which uses feedback to maintain the oscillation at the resonant frequency of the device, thereby optimizing the efficiency of operation and overcoming the frequency mismatching inhere...	11/20/1990
4868527	Frequency set-on oscillator A frequency set-on oscillator comprises an input switch (12) an amplifier (22) and a delay line (16). A frequency divider (14) having two outputs is provided in line with the input switch (12). The two outputs of the frequency divider are connected to a m...	09/19/1989
4767999	Method of and apparatus for radio-frequency generation in resonator tank circuits excited by sequential pulses of alternately opposite polarity A method of and apparatus for exciting harmonic generation of radio frequency in a tank resonant circuit by bipolar spaced, half-cycle pulses, wherein the period of the tank resonant frequency oscillations is 1/N the period between successive pulses of si...	08/30/1988
4618835	Proximity sensor oscillator utilizing controlled charge A proximity sensor oscillator is disclosed having controlled charge. The proximity sensor oscillator includes a resonant circuit which oscillates at a frequency determined by the components of the resonant circuit and with a power loss that is inversely r...	10/21/1986
4138679	Circuit for synchronizing the oscillation of a pulsed oscillator with a reference oscillation A circuit is provided for synchronizing the oscillation Uo of a pulsed oscillator with a reference oscillation Um of comparatively small amplitude. The reference oscillation is coupled into the oscillator and a phase control loop is ...	02/06/1979
3995234	Ringing oscillator including a resonant circuit with frequency divider feedback loop A tuned circuit resonates to produce a ringing signal. The signal is fed to frequency divider which generates an oscillator output pulse. The pulse is fed back to the tuned circuit for impulse excitation thereof, producing subsequent oscillator output pul...	11/30/1976

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Class 331/166 - With keying means of the active element type (e.g., burst generator)