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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 7391273 | Clock signal output apparatus and control method of same, and electric apparatus and control method of same The clock signal output device has a crystal oscillator for generating a reference clock signal and generating and outputting an output clock signal having a prescribed frequency on the basis of the reference clock signal. The device also has an atomic oscillator fo... | 06/24/2008 |
| 7345551 | Frequency synthesizer for mixing reference frequencies A frequency synthesizer for mixing reference frequencies using at least one control signal has a local oscillator, frequency dividers for dividing a frequency generated from the local oscillator and generating at least one control signal, and a single side band (SSB... | 03/18/2008 |
| 7277683 | Regenerative divider for up and down conversion of radio frequency (RF) signals The present invention relates generally to communications, and more specifically to a method and apparatus for generating local oscillator signals used for up- and down-conversion of RF (radio frequency) signals. A major problem in the design of modulators and demod... | 10/02/2007 |
| 7146149 | High isolation switch buffer for frequency hopping radios A local oscillator (LO) circuit is disclosed which provides improved isolation between the unselected LO source and a mixer. The LO circuit includes a first LO source to generate a first periodic signal cycling at a first frequency, a second LO source to generate a ... | 12/05/2006 |
| 5831481 | Phase lock loop circuit having a broad loop band and small step frequency A phase lock loop circuit includes an oscillator, a digital mixer, a comparator, a loop amplifier, and a low-pass filter. The oscillator has an oscillation frequency controlled by a control voltage. The digital mixer is constituted by a digital element to... | 11/03/1998 |
| 5712602 | Phase-locked oscillator for microwave/millimeter-wave ranges An VCO generates a high-frequency signal based on a modulating signal and a phase-locking control signal. A first distributor separates the high-frequency signal into two parts, one of which is outputted as an oscillator output signal. An n-multiplier and... | 01/27/1998 |
| 5373256 | PLL frequency synthesizer having a main loop and a secondary loop A frequency synthesis system for generating microwaves which includes a main loop with a low gain electronically tunable voltage controlled oscillator (VCO) covering the entire desired frequency bandwidth, and a secondary loop including a direct synthesis... | 12/13/1994 |
| 5243302 | Voltage controlled oscillator with correction of tuning curve non-linearities A scanning-superhetrodyne ESM receiver having a VCO for a local oscillator which is linearized and temperature compensated. A stable combline oscillator is used to generate known frequency signals which are frequency converted to an intermediate frequency... | 09/07/1993 |
| 5218324 | Device for the control of a phase-locked loop with frequency changing A device for the control of a phase-locked loop with frequency changing comprises an oscillator (10), a mixer (20) of signals, and a phase/frequency detector (40). The control device comprises a frequency comparator (60) to compare the frequency Fv of the... | 06/08/1993 |
| 5179725 | Voltage controlled oscillator with correction of tuning curve non-linearities A scanning-superhetrodyne ESM receiver having a VCO for a local oscillator which is linearized and temperature compensated. A stable combline oscillator is used to generate known frequency signals which are frequency converted to an intermediate frequency... | 01/12/1993 |
| 5023572 | Voltage-controlled oscillator with rapid tuning loop and method for tuning same An oscillator circuit is coupled to receive first and second reference signals and includes a voltage-controlled oscillator for generating an oscillating signal. A difference frequency calculation circuit is coupled to the voltage-controlled oscillator to... | 06/11/1991 |
| 4994762 | Multiloop synthesizer with optimal spurious performance An improved mixed down synthesizer scheme 10 having a first phase locked loop 12 and a second phase locked loop 14 provides a first frequency and a second frequency respectively. The first phase locked loop 12 has at least a first programmably tunable fil... | 02/19/1991 |
| 4882549 | Center offset microwave frequency synthesizer An improved microwave frequency signal source using a single frequency offset technique which increases the frequency range of an indirect frequency synthesizer to twice the highest operating frequency of the programmable digital frequency divider in the ... | 11/21/1989 |
| 4814727 | Wide-deviation tracking filter circuit A wide deviation tracking filter is provided which has the input signal to be tracked applied to a low frequency phase-locked loop circuit which performs coarse filtering of the phase noise on the input signal. A digital phase shifter is connected in seri... | 03/21/1989 |
| 4634999 | RF oscillator frequency stabilizing circuit using self-mixing with reference frequency A frequency stable RF oscillator 10 comprises a variable frequency RF source in the form of a microwave cavity 24 having a Gunn diode 26 and a varactor 28 mounted therein, and produces an RF output frequency fo. The output of a frequency stable... | 01/06/1987 |
| 4584539 | Frequency-agile, multi-channel, microwave frequency synthesizer A multi-channel frequency synthesizer, including a crystal oscillator circuit that may be selectively operated to provide a reference signal at a selected reference frequency that is one of a given plural number of frequencies; an IF generator for process... | 04/22/1986 |
| 4453136 | AFC System for controlling an oscillator according to an input frequency An automatic frequency control system includes a frequency measuring unit (IFM), which produces a frequency quantity representing the frequency of its input signal, and a controllable-frequency signal generator (VCO), which produces an output signal whose... | 06/05/1984 |
| 4409563 | Phase locked loop frequency synthesizer with frequency compression loop A phase locked loop synthesizer including a phase locked loop (PLL) having a first characteristic loop bandwidth, for generating a synthesized signal, the PLL including a signal controlled oscillator (SCO) having first and second control inputs for contro... | 10/11/1983 |
| 4366451 | Chrominance subcarrier regeneration network A chrominance subcarrier regeneration network having high stability, the network being adapted for use in a video tape recorder and including a phase detector for comparing the phase of a gated subcarrier burst of a video signal with that of a subcarrier ... | 12/28/1982 |
| 4266295 | Continuous tuning control particularly adapted for use in variable frequency receivers and generators This disclosure describes a continuous tuning arrangement for a variable frequency response circuit of the type covering a relatively wide frequency range. Many techniques for accommodating a wide frequency range are known and include synthesizers, wavefo... | 05/05/1981 |
| 4024460 | Electronic line stretcher A network analyzer is provided with an electronically variable phase shifter in the IF portion of the reference channel, and the phase shifter is connected to sweeping signal generator (sweeper) driving the device under test. As the output frequency of th... | 05/17/1977 |
| 3993962 | Low noise parametric varactor diode crystal oscillator A low noise frequency source utilizes a varactor diode to form a parametric crystal oscillator which may be frequency multiplied to the desired microwave frequency, for radar applications.... | 11/23/1976 |
| 3931586 | Scanning oscillator stabilization Linear accuracy of the output-signal frequency of a scanning oscillator is aintained through monitoring the location in a shift register of a pulse whose position is indicative of the frequency error from a desired scanning oscillator output-signal frequen... | 01/06/1976 |
