Abstract: Tunable delay circuit devices have an input port, an output port, at least three parallel paths connecting the input port and the output port, on each path, an input switch and an output switch, and on each path, a plurality of shunt resonant tanks connected between the input switch and the output switch, each shunt resonant tank periodically chargeable from the input port and dischargeable to the output port by operation of the input switch and the output switch.

Abstract: A power supply circuit includes a first voltage regulator to generate a first supply voltage for a first circuit of a phase-locked loop and a second voltage regulator to generate a second supply voltage for a second circuit of the phase-locked loop. The first and second supply voltages are independently generated by the first and second voltage regulators based on the same reference signal. The first circuit may be a charge pump and the second circuit may be a voltage-controlled oscillator. Different circuits may be supplied with the independently generated supply voltages in alternative embodiments.

Abstract: An oscillator for use in a preconditioner includes a rectifier, a converter receiving an input voltage and supplying an output voltage, and a control unit effecting peak current mode control. The oscillator has a switching frequency with a period dependent on the input voltage and the output voltage.

Abstract: A microwave oven includes a microwave generating apparatus having a cathode, a first grid for controlling the flow of electrons from the cathode, the first grid having holes for converting electrons from the cathode to the electron beams, a choke structure, positioned between the cathode and the first grid, for serving as a blocking capacitor, wherein the cathode, the first grid and the choke structure define an input cavity functioning as a resonant circuit, a resistor, one end of which is connected to the first grid and the other end thereof is connected to the cathode, for inducing a bias voltage on the first grid, a second grid provided above the first grid and having holes through which the electron beams passing through holes of the first grid pass, an anode for receiving the electrons passing through the holes of the second grid, wherein the second grid and the anode define an output cavity for generating a microwave, the output cavity being electrically insulated from the input cavity, and a driving v

Abstract: A microwave oven includes a cooking chamber, a waveguide, and an apparatus for generating a microwave frequency energy.

Abstract: An apparatus for generating a microwave frequency energy includes a cathode for emitting electrons, a first grid for controlling and focusing the flow of electrons from the cathode, a choke structure for serving as a capacitor, wherein the cathode, the first grid and the choke structure define an input cavity functioning as a resonant circuit.

Abstract: An apparatus for generating a microwave frequency energy includes a cathode for emitting electrons, a first grid for controlling and focusing the flow of electrons from the cathode, a choke structure for serving as a capacitor, wherein the cathode, the first grid and the choke structure define an input cavity functioning as a resonant circuit.

Abstract: A microwave oven includes a microwave generating apparatus having a cathode, a first grid for controlling the flow of electrons from the cathode. The first grid has holes for converting electrons from the cathode to the electron beams and a metal film for reducing emission of secondary electron from the first grid. The cathode, the first grid and the choke structure define an input cavity functioning as a resonant circuit. The microwave generating apparatus further includes a resistor for inducing a bias voltage on the first grid, a second grid having holes through which the electron beams passing through holes of the first grid pass, an anode for receiving the electrons passing through the holes of the second grid, and a driving voltage source for providing a driving voltage to the cathode and the anode. The anode is provided with a plurality of protuberances for reducing emission of secondary electron from the anode. The second grid and the anode define an output cavity for generating a microwave.

Abstract: A microwave oven includes a microwave generating apparatus having a cathode, a first grid for controlling the flow of electrons from the cathode, the first grid having holes for converting electrons from the cathode to the electron beams, a choke structure, positioned between the cathode and the first grid, for serving as a blocking capacitor, wherein the cathode, the first grid and the choke structure define an input cavity functioning as a resonant circuit, an array of resistors, one end of which is connected to the first grid and the other end thereof is connected to the cathode, for inducing a bias voltage on the first grid, a controller for controlling the array of resistors to make a plurality of resistance values, a second grid provided above the first grid and having holes through which the electron beams passing through holes of the first grid pass, an anode for receiving the electrons passing through the holes of the second grid, wherein the second grid and the anode define an output cavity for gene

Abstract: An FED, modified with an electrostatically deformable anode, has a control network attached to electrodes thereof to switch the FED off as the anode is deformed by electrostatic force and switch the FED on as the anode returns to a quiescent state. Frequency selectivity is realized by incorporating a variable frequency determining network within the control network.

Abstract: An optical generator of an electrostatic field at light frequencies tuneable over the entire band of visible light frequencies including a pair of spaced electrodes in a gas filled tube having at least one absolute condenser plate adjacent one electrode, a dielectric-filled container enclosing the tube, and a resonant circuit operable to generate electric light of a selected frequency.