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| Number | Title | Issue Date |
| 7696794 | Drive circuit for a switch in a switching converter The invention relates to a drive circuit for providing a drive signal (S3) for a switch in a switching converter in a manner dependent on a control signal (S2), the drive circuit comprising at least two groups (22, 30) of circuit components, eac... | 04/13/2010 |
| 7388413 | Ramp generator with fast reset An efficient ramp generator uses a reversing switch array to couple a timing capacitor in alternating polarities between an input terminal and an output terminal of an operational amplifier to generate a periodic ramp signal without discharging the timing capacitor ... | 06/17/2008 |
| 7362149 | Zero crossing detection and correction upon a distorted primary AC power line voltage Zero crossings for a non-symmetrical VIN may be determined by first amplifying and clipping VIN to create a non-symmetrical square wave whose zero crossings are those of VIN. A selected polarity edge of the non-symmetrical square wav... | 04/22/2008 |
| 7353412 | Electrical circuit for controlling power supply and motor vehicle built-in device being operably connected to an external power supply The number of electrical devices implemented in motor vehicles and supplied with electricity by the motor vehicle battery rises with each generation. The manufacturers of motor vehicles make great demands on electrical device to be built-in their motor vehicles, esp... | 04/01/2008 |
| 7317362 | Oscillator circuit and oscillation control method An oscillator circuit is disclosed that includes a first oscillation part configured to output a first oscillation output by charging and discharging a first capacitor, and a second oscillation part configured to output a second oscillation output by charging and di... | 01/08/2008 |
| 7230561 | Programmable integrating ramp generator and method of operating the same A ramp generator for an analog-to-digital converter comprises an array of capacitors each controlled by a switch responsive to one or more control signals and operable to connect/disconnect one or more of the capacitors relative to the array and a current source ope... | 06/12/2007 |
| 7155603 | Circuit arrangement for detecting the state of at least one electrical switch Circuit arrangement for detecting the state of at least one electrical switch having at least one set input (Set1, Set2, Set3) in each case and at least one sensor output (Sensor1, Sensor2, Sensor3) in each case, each of whi... | 12/26/2006 |
| 7126520 | Segmented sawtooth generator Generation of segmented sawtooth waveforms. A desired waveform is divided into intervals. A slope is associated with each interval. A charge current representing the slope is applied to a timing capacitor during each interval. Responsive to a clock signal, a counter... | 10/24/2006 |
| 7116138 | Ramp signal generation circuit A ramp signal generation circuit is disclosed. The ramp signal generation circuit comprises a ramp signal generator, a buffer, a comparator, and a switching circuit. The switching circuit provides current to an output of the ramp signal generation circuit in respons... | 10/03/2006 |
| 7075346 | Synchronized frequency multiplier for multiple phase PWM control switching regulator without using a phase locked loop A method and circuit for synchronizing an input clock signal with a plurality of internal clock signals in a multiple phase Pulse Width Modulation (PWM) switching power supply without using a Phase Locked Loop (PLL). A period of the input clock signal is measured by... | 07/11/2006 |
| 7026848 | Pre-driver circuit A pre-driver circuit for use in high speed signaling systems is disclosed. In one particular exemplary embodiment, the pre-driver circuit may comprise an input transistor, an active load, a passive load, and a current source. The input transistor has a gate terminal... | 04/11/2006 |
| 6956431 | Pulse width modulation amplifier A pulse width modulation (PWM) amplifier which is capable of reducing unwanted radiation from a PWM output thereof, which can cause EMI, while reducing manufacturing costs thereof. A triangular wave-generating circuit (3) of the PWM amplifier outputs a triang... | 10/18/2005 |
| 6906563 | Generating a waveform having one signal level periodically and different signal levels in other durations Generating a waveform having one signal level periodically and different signal levels in other durations. Two input signals are received, one having a desired constant level and another having desired signal levels. The desired output waveform is generated by selec... | 06/14/2005 |
| 6791405 | Triangular wave generating circuit used in a Class-D amplifier The integrating circuit of the triangular wave generating circuit includes an operational amplifier and a capacitor. Switch elements are alternatively turned ON and capacitors are alternatively recharged by the currents flowing in constant-current circuits thus obta... | 09/14/2004 |
| 6650153 | Generator circuit for voltage ramps and corresponding voltage generation method A generator circuit for voltage ramps is provided that includes a differential stage with positive feedback coupled between a first and a second voltage reference and having a first output connected to a control terminal of a first output transistor. The ... | 11/18/2003 |
| 6384645 | Integrated generator of a slow voltage ramp An integrated circuit for producing a small slope voltage ramp includes a circuit for generating a periodic triangular current signal, and a circuit for generating, at the beginning of each period of the triangular signal, a pulse of a certain duration wh... | 05/07/2002 |
| 6278301 | Circuit and method for modulating the base frequency of a waveform generator An improved waveform generator (10) permits digital spectrum spreading by employing circuitry for controlling the charging and discharging of a load capacitor (24) to alter the generator's base frequency. A charge/discharge circuit (22) modulates the curr... | 08/21/2001 |
| 6169433 | Method and apparatus using feedback to generate a ramped voltage with controlled maximum amplitude A method and circuit which employs negative feedback to generate a ramped voltage having well controlled maximum amplitude. In preferred embodiments, the invention is an integrated circuit (or portion of an integrated circuit) which generates a ramped vol... | 01/02/2001 |
| 6111440 | Circuit for generating interleaved ramped voltage signals having uniform, controlled maximum amplitude A circuit having multiple channels for generating multiple ramped voltage signals (preferably of a type useful in an interleaved PWM dc/dc converter) such that each ramped voltage signal has a different phase, and all the ramped voltage signals have a uni... | 08/29/2000 |
| 6094077 | Dynamically controlled timing signal generator A dynamically controlled timing signal generator includes a source of a controlled current, a timing signal generating circuit coupled to the controlled current source for generating the timing signal, and a feedback circuit coupled to the controlled curr... | 07/25/2000 |
| 5955903 | Folded ramp capacitance circuit with current source and comparator circuit A frequency-to-current converter includes several capacitances with capacitive values that are effectively multiplied. After each of a series of periodic pulses, the voltage on a "ramp" capacitance is charged to a starting voltage. Then, during the period... | 09/21/1999 |
| 5804999 | Appliance AC power control apparatus An apparatus for controlling an electrical appliance coupled with an output terminus and configured to operate in response to an alternating input signal, such as input AC power. The apparatus comprises a reference signal generator for receiving the input... | 09/08/1998 |
| 5777503 | Pulse width modulation bias to minimize effect of noise due to ramp switching A control system using pulse width modulation, current-mode control to regulate a flyback converter for small input currents. The control system generates a ramp voltage indicative of an input current of the converter with an added bias to overcome the ef... | 07/07/1998 |
| 5760623 | Ramp voltage generator for differential switching amplifiers A low-power differential switching amplifier (200, 210, 220, 230) is provided which utilizes a unique technique of generating interlaced ramps. The interlacing of the ramps causes the ramp discharge time to be effectively zero, which produces exceptionall... | 06/02/1998 |
| 5736879 | Closed-loop frequency-to-current converter with integrable capacitances A frequency-to-current converter includes several capacitances with capacitive values that are effectively multiplied. After each of a series of periodic pulses, the voltage on a "ramp" capacitance is charged to a starting voltage. Then, during the period... | 04/07/1998 |
| 5729167 | Low power consumption switch interface circuit A low power consumption switch interface circuit (100) includes a current source (109) for providing switch current (144) having a magnitude dependent on a state of a current range signal (135). An input terminal (142) is provided to conduct the switch cu... | 03/17/1998 |
| 5677644 | Ramp generating structure for producing color graphics A graphics engine is disclosed which can be used in a color desktop publishing system. The graphics engine accepts 32-bit RGBM data and performs pixel level calculations under computer control to output processed 32-bit RGBM data The engine comprises a re... | 10/14/1997 |
| 5642066 | Linear ramp generator having two voltage controlled current sources An ultra-linear chirp generator includes a voltage controlled oscillator (VCO) having a tuning characteristic which is naturally nonlinear, a linear ramp generator which generates a linearly ramping output signal having a linear slope characteristic with ... | 06/24/1997 |
| 5557241 | Linear chirp generation using VCO tuning with polynomial predistortion An ultra-linear chirp generator includes a voltage controlled oscillator (VCO) having a tuning characteristic which is naturally nonlinear, a linear ramp generator which generates a linearly ramping output signal having a linear slope characteristic with ... | 09/17/1996 |
| 5502419 | Pulse width modulation signal generation and triangular wave signal generator for the same A triangular wave generator circuit having a triangular wave generator unit for generating a triangular wave signal, and a comparator for comparing the generated triangular wave signal with a predetermined level. The triangular wave generator unit control... | 03/26/1996 |
| 5477174 | Ramp generator A ramp generator has an integrator, which provides a ramp output, and a counter, which counts a clock signal during the rise period. The counter and clock are arranged so that when the actual rise time is equal to the desired rise time, the counter overfl... | 12/19/1995 |
| 5394020 | Vertical ramp automatic amplitude control A vertical ramp generator includes a voltage controllable charge current source and a switched discharge current source coupled across a ramp capacitor. A pair of comparators coupled to first and second reference potentials are supplied with the ramp capa... | 02/28/1995 |
| 5225714 | Sawtooth waveform generator for a convergence correction circuit Electric charges are stored on a capacitor and then the charges are discharged so that a sawtooth wave for use in a convergence correction circuit for a display or the like is generated. When the sawtooth wave is used for a multi-scan display, the charge ... | 07/06/1993 |
| 4851709 | Variable frequency, fixed amplitude digital sweep generator A variable frequency, fixed amplitude digital sweep generator for use with a cathode ray tube based instrument useful in troubleshooting, diagnosing, and servicing spark ignition internal combustion engines. A first counter (8) measures the period between... | 07/25/1989 |
| 4739228 | Electric circuit for S correction of the vertical scanning ramp in a television apparatus A variable-gain rectifier-amplifier with regulated voltage converts the output ramp of a ramp generator with regulating resistance of ramp amplitude into a triangular wave form with adjustable linearity which a feedback circuit brings back to said regulat... | 04/19/1988 |
| 4728813 | Timebase generator with improved linearity and recovery time A timebase generator includes a transistor switch performing a sweep gate function, alternately providing a current path for retrace and then disconnecting such current path to allow generation of a time base ramp. The bias current delivered to the switch... | 03/01/1988 |
| 4626702 | Saw-tooth wave generating circuit A saw-tooth wave generating circuit is formed by providing a constant current source with negative feedback through an operational amplifier. The operational amplifier compares a reference voltage with the voltage across a resistor through which a current... | 12/02/1986 |
| 4611176 | Precision linear ramp function generator A ramp function generator is provided which produces a precise linear ramp unction which is repeatable and highly stable. A derivative feedback loop is used to stabilize the output of an integrator in the forward loop and control the ramp rate. The ramp ma... | 09/09/1986 |
| 4520276 | Zero-delay ramp generator An error amplifier receives an on/off signal and supplies an error signal to an integrator. The latter provides a ramp output, which is fed back to the error amplifier whereby the error signal therefrom further is dependent upon the ramp output. The error... | 05/28/1985 |
| 4516036 | Linear ramp voltage generator circuit A generating circuit for producing a linear ramp output voltage comprises an electronic switch and a ramp circuit connected to the electronic switch. The ramp circuit includes a single active component having first and second input terminals and an output... | 05/07/1985 |
