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| Number | Title | Issue Date |
| 7764091 | Square to pseudo-sinusoidal clock conversion circuit and method A square wave to pseudo-sinusoidal clock conversion circuit comprises first and second stages. The first stage includes a cross-coupled differential pairs input gain stage having positive and negative input sides. Responsive to a differential square wave clock input... | 07/27/2010 |
| 7595669 | Method and apparatus for producing clean, undistorted variable voltage 50-60 Hz sine wave The invention is directed to a solid-state replacement for a variable transformer. The circuit arrangement presented is not placed in series with the load. It can change output voltage quickly, and is able to deliver more current to the load than is drawn from the s... | 09/29/2009 |
| 7423460 | Sine wave shaper with very low total harmonic distortion Apparatus (20) for generating a sine shaped output signal at an output (Sn, Sp). The apparatus (20) comprises a first transistors (M1) and a second transistor (M2) being arranged as differential pair (22). The differential pair ( | 09/09/2008 |
| 7362150 | Method and system for synchronizing phase of triangular signal A multiplicity of electronic devices is provided to generate triangular wave signals variable between an upper and lower limit voltages by charging or discharging capacitors. One of the triangular wave signals serves as a master triangular wave signal for controllin... | 04/22/2008 |
| 7282970 | Device and method for generating one-shot bipolar waveform In the present invention, a device and method for generating one-shot bipolar waveforms are provided. The provided device can generate bipolar sawtooth waves, bipolar sinusoidal waves and bipolar square waves by employing a division circuit, an one-shot circuit, an ... | 10/16/2007 |
| 7280061 | Digital-to-analog converter using a frequency hopping clock generator Method and device for reducing the signal images at the output of a digital/analog converter. In a method for reducing the signal images at the output of a digital/analog converter, a frequency hopping clock generator provides a digital data signal whose data rate i... | 10/09/2007 |
| 7272365 | Frequency offset correction in transmitters having non-ideal synthesizer channel spacing In a receiver of a transmission system in which the data transmission rate is not an integer multiple of the spacing between transmission channels, a single oscillator is used to generate both the system clock used to process the data signal as well as the mixing si... | 09/18/2007 |
| 7231266 | Digital control device and program A digital control device for tracking a sine wave according to the present invention has a compensator, a control object and a feedback gain. An input into the compensator is a signal obtained by subtracting a control quantity from a reference value. An input into t... | 06/12/2007 |
| 7225090 | Method for measuring capacitance and equivalent parallel resistance CX is measured in the presence of RP by charging CX with a constant current IC for a period time and taking four (time, voltage) pairs: (tA,VA), (tB,VB), (tC,VC | 05/29/2007 |
| 7224196 | Method and system for synchronizing phase of triangular signal A multiplicity of electronic devices is provided to generate triangular wave signals variable between an upper and lower limit voltages by charging or discharging capacitors. One of the triangular wave signals serves as a master triangular wave signal for controllin... | 05/29/2007 |
| 7222055 | High bandwidth real-time oscilloscope A method and apparatus for digitizing a signal. The method comprises the steps of receiving an input analog signal, splitting the received input analog signal into a plurality of signals and frequency converting at least one of the signals in accordance with a prede... | 05/22/2007 |
| 7219037 | High bandwidth oscilloscope A method for improving bandwidth of an oscilloscope involves, in preferred embodiments, the use of frequency up-conversion and down-conversion techniques. In an illustrative embodiment the technique involves separating an input signal into a high frequency content a... | 05/15/2007 |
| 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 |
| 7199747 | Generating a fine time offset using a SiGe pulse generator A method and apparatus for generating short electronic pulses using a modified differential trigger that is partly an analogue sinusoidal voltage and partly a selectable, DC voltage. The differential trigger is applied to a differential base band pulse generator hav... | 04/03/2007 |
| 7174136 | Direct conversion radio transceiver A radio transceiver capable of transmitting and receiving on a common radio channel in a half duplex mode includes a direct conversion transmitter and a low IF receiver. A common signal generator (2, 2′, 2″) comprises a first and second frequency generato... | 02/06/2007 |
| 7154396 | Ultra wideband radio frequency identification techniques Ultra wideband (UWB) techniques are applied to radio frequency identification (RFID). For instance, a reader generates a UWB IR interrogation signal, and receives a UWB IR reply signal from an RFID tag in response to the interrogation signal. In addition, the reader... | 12/26/2006 |
| 7139684 | High bandwidth real time oscilloscope A method and apparatus for digitizing a data signal, the method comprising the steps of receiving an input analog data signal, splitting the received input analog data signal into a plurality of split signals, and mixing at least one of the split signals with a pred... | 11/21/2006 |
| 7119588 | Circuit for multiplying continuously varying signals A means for obtaining an output signal which is the sum of the frequencies of two periodic input signals that may vary in amplitude and frequency over time. The apparatus, which provides means for realizing trigonometric functions of the form sin(α+β)=2 sin α cos... | 10/10/2006 |
| 7075347 | 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 inc... | 07/11/2006 |
| 7058548 | High bandwidth real-time oscilloscope A method and apparatus for digitizing a data signal. An input analog data signal, is received and split into a plurality of split signals. At least one of the split signals is mixed with a predetermined periodic function with a predetermined frequency. The split sig... | 06/06/2006 |
| 7046053 | Total harmonic distortion standard Embodiments of the invention provide a method and an apparatus for generating a total harmonic distortion reference signal. A triangle wave having a predetermined frequency and a predetermined amplitude is generated. The triangle wave is filtered to produce a signal... | 05/16/2006 |
| 7046014 | ATE measurement technique for comparator threshold voltage A system and a method for testing a comparator include generating two triangular waveform segments having the same period and different amplitudes, inputting the two triangular waveform segments into a comparator, receiving an output of the comparator, and calculati... | 05/16/2006 |
| 7038332 | Power discriminating systems The present invention relates to a control system for selectively supplying electrical power in a remote environment. The system comprises a plurality of electrical circuits, each designed to operate over a unique frequency passband. Power transmitted within the fre... | 05/02/2006 |
| 7035339 | Carrier recovery apparatus for digital QAM receivers A carrier recovery apparatus for digital Quadrature Amplitude Modulation (QAM) receivers is disclosed. The carrier recovery apparatus includes a phase detector, a lock controller, a frequency locker and a phase loop filter, and provide phase/frequency error informat... | 04/25/2006 |
| 7019567 | Sine wave generation circuit A sine wave generation circuit for generating a high precision pseudo sine wave without increasing the circuit size including a pulse generation circuit for generating a plurality of pulse signals using an input clock signal as reference and a voltage output circuit... | 03/28/2006 |
| 7002816 | Power supply apparatus and image forming apparatus using the same A power supply apparatus includes first and second switching elements respectively controlled by first and second clock signals, a first parallel resonance circuit connected between the first switching element and a dc power supply, a second parallel resonance circu... | 02/21/2006 |
| 6954114 | NCO with rational frequency and normalized phase A numerically controlled oscillator (NCO) system for generating rational frequencies with normalized phase is disclosed. In one embodiment, the system comprises a rational NCO and a simple NCO. The rational NCO generates an overflow or correction value, based on a d... | 10/11/2005 |
| 6952239 | Sine generation circuit, phase shift circuit and tint adjustment circuit A phase shift circuit includes a first sine generation circuit generating a sine-converted output signal (sin θ) of the phase shift input signal (θ) and a reversed sine-converted output signal (−sin θ) of the phase shift input signal (θ), a cosine generation c... | 10/04/2005 |
| 6917247 | NCO based timebase recovery system and method for A/V decoder Systems and methods are disclosed for recovering a clock or time reference for A/V systems. One method comprises receiving at least one input time reference generated using a first clock and generating, using a second clock asynchronous to the first clock, at least ... | 07/12/2005 |
| 6859076 | Combination triangular waveform generator and triangular to pseudo-sinusoidal waveform converter circuit The present invention comprises an integral triangular voltage waveform generator (170, 180) and triangular to pseudo-sinusoidal current waveform converter (170, 180). The outputs of the present invention are preferably differential (130, 131), ... | 02/22/2005 |
| 6833740 | Sinusoidal frequency generator and periodic signal converter using thereof A sinusoidal frequency generator comprising an oscillation circuit controlled by a control voltage, characterized in that the oscillating circuit is a gyrator made up of two transconductance amplifiers whose bias points are fixed by the control voltage in order to r... | 12/21/2004 |
| 6693470 | Method and arrangement for generating cyclic pulses The invention relates to a method and an arrangement for generating cyclic pulses. A first differential pair includes an input for a first unipolar pulse, and a second input for a second unipolar pulse, the first unipolar pulse and the second unipolar pul... | 02/17/2004 |
| 6664819 | Frequency synthesizer for improving a unique DDS characteristic A frequency synthesizer that improves a unique DDS characteristic, while maintaining a circuit scale (ROM size) of a direct digital synthesizer (DDS). A first digital signal generator generates a quantized frequency signal, and a second digital signal gen... | 12/16/2003 |
| 6650150 | Numerically controlled oscillator in particular for a radiofrequency signal receiver The numerically controlled oscillator (8) is mounted in particular in a radiofrequency signal receiver which further includes means (3) for receiving and shaping the radiofrequency signals, a correlation stage (4) and a clock signal generator. The oscilla... | 11/18/2003 |
| 6573766 | Synthesizing a sine wave A method and apparatus for synthesizing an approximation to a sine wave comprising generating a number of pulse width modulated signals, each having a predetermine duty cycle and being the same frequency as each other, from a clock signal. The generated p... | 06/03/2003 |
| 6518802 | Circuits and methods for generating an accurate digital representation of a sinusoidal wave A numerically controlled oscillator that generates an accurate digital representation of a repeating waveform such as a sinusoidal wave. Based on the desired output frequency, multiple samples are calculated from multiple cycles of the repeating waveform.... | 02/11/2003 |
| 6483356 | Sinusoidal signal generating circuit providing small phase difference with respect to reference signal and apparatus for driving oscillating element with circuit A sinusoidal signal generating circuit for ensuring a small phase difference with respect to a reference signal is provided. The sinusoidal signal generating circuit comprises a capacitor for charging/discharging, a charging unit for charging a predetermi... | 11/19/2002 |
| 6356124 | Method and apparatus for generating a digital sine wave signal A signal generator is disclosed. The signal generator includes a variable frequency selector that is configured to provide a variable frequency for generation of a variable frequency signal. The signal generator also includes a periodic signal generator. ... | 03/12/2002 |
| 6320431 | Apparatus and method of generating numerically controlled oscillator signals An apparatus according to a preferred embodiment of the present invention includes two memories each storing different octants of a sine (or cosine) waveform. The sine and cosine waveforms may be concurrently generated by alternately accessing each memory... | 11/20/2001 |
| 6240127 | Method for reducing interference, and synthesizer arrangement The invention relates to a method for reducing interfering signals from an output signal of a digital synthesizer arrangement and to a synthesizer arrangement which comprises a reception means (10) which receives a signal which determines the frequency of... | 05/29/2001 |
