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| Number | Title | Issue Date |
| 7443147 | DC-DC converter with step-up and step-down control capable of varying the offset voltage of the PWM triangle When both step-up PWM control and step-down PWM controls are executed, the offset of the ON/OFF switching timing for step-up PWM control and/or the offset of ON/OFF switching timing for step-down PWM control are changed to become identical. By synchronizing ON/OFF s... | 10/28/2008 |
| 7365603 | FET amplifier, pulse modulation module, and radar device An FET amplifier includes an FET for amplifying a high-frequency signal to be input to the gate on the basis of a gate bias voltage from a gate bias control circuit. In the FET amplifier, a high-frequency signal input circuit and the output portion of an inverting a... | 04/29/2008 |
| 7345464 | PWM power supply controller having multiple PWM signal assertions and method therefor In one embodiment, a PWM power supply controller asserts a PWM control signal synchronously to a clock signal of the PWM controller and also asserts the PWM control signal asynchronously to the clock signal. ... | 03/18/2008 |
| 7279947 | PWM buffer circuit for adjusting a frequency and a duty cycle of a PWM signal A PWM buffer circuit includes a duty cycle converting circuit and a frequency-fixed PWM signal generating circuit. The duty cycle converting circuit is used for receiving a first PWM signal and then generating a duty cycle reference voltage on the basis of the first... | 10/09/2007 |
| 7269217 | PWM controller with integrated PLL A pulse-width modulation (PWM) controller to supply power to electronic components using a phase lock loop (PLL) is presented. A PWM controller comprises an input node operable to receive a reference signal and a phase-locked loop (PLL). The PLL comprises an oscilla... | 09/11/2007 |
| 7183823 | Method of generating a pulsed output signal from a periodic ramp signal and a reference voltage, and a switch mode power converter In the proposed method of generating a pulsed output signal from a periodic ramp signal and a reference voltage, the linear range of duty cycles of the pulsed output signal is significantly extended to minimum values. The ramp signal and the reference voltage are ap... | 02/27/2007 |
| 7113053 | Pulse-width modulation signal generating device and method for generating pulse-width modulation signals Pulse-width modulation signal generating device and method for the same that can generate multiple pulse-width modulation signals with different overall lengths wherein only a small amount of data is stored in storage means and duty cycles are varied between individ... | 09/26/2006 |
| 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 |
| 6970051 | Pulse width modulator circuit having negative bias A pulse width modulator is presented herein and it includes a pulse width driver circuit that receives a time varying ramp signal that is modulated by a time varying analog input signal to produce a pulse width modulated drive signal comprised of turn-on pulses havi... | 11/29/2005 |
| 6970503 | Apparatus and method for converting analog signal to pulse-width-modulated signal A circuit for converting an analog signal to a discrete pulse-width-modulated (PWM) signal uses a delta-sigma amplifier and a discrete PWM stage to produce a discrete PWM output signal having lower in-band signal noise then a PDM system and a lower signal distortion... | 11/29/2005 |
| 6963629 | Adaptive phase locked loop A reference signal and a voltage controlled oscillator (VCO) output are compared for relative phase and frequency differences. A lead error signal is generated if the reference signal leads the VCO output and a lag error signal is generated if the reference signal l... | 11/08/2005 |
| 6914935 | Fractional N synthesizer with reduced fractionalization spurs A fractional N synthesizer is disclosed. The synthesizer includes a phase detector that receives first and second input signals and generates a pulse width modulated (PWM) output signal having a pulse width indicative of the phase relationship between the input sign... | 07/05/2005 |
| 6765449 | Pulse width modulation circuit A pulse width modulation circuit of the present invention includes: pulse generation means being provided with a first power supply and charged with a first current and a second current between which a constant current is distributed to turn ON/OFF a switching eleme... | 07/20/2004 |
| 6636125 | Modulation device of the pulse width of very high-frequency signals The present invention relates to a modulation device MD, which is designed to produce an output signal Vout comprising a succession of pulses. According to the invention, a device of this type includes: two transistors T1 and T2, which are arranged as a differe... | 10/21/2003 |
| 6439679 | Pulse with modulation signal generating methods and apparatuses A pulse width modulator (PWM) circuit is provided. The PWM circuit includes a selective synchronization circuit configured to receive vector signals, and selectively synchronize the vector signals. The synchronized vector signals are provided to a tap sel... | 08/27/2002 |
| 6390579 | Pulse width modulator using delay-line technology with automatic calibration of delays to desired operating frequency A pulse width modulator includes a clock operative to count successive discrete time intervals having a period equal to a desired full pulse width, and configured to generate a clock signal. The pulse width modulator also includes an adjustable delay line... | 05/21/2002 |
| 6249161 | Method and device for generating a pulse signal with modulable-width pulses A method is provided for generating a pulse signal with modulable-width pulses. A set-point signal is generated and compared with a control signal so as to produce the pulse signal. When the control signal is a two-state logical signal, a first reference ... | 06/19/2001 |
| 6246296 | Pulse width modulator (PWM) with high duty cycle using bootstrap capacitor A pulse width modulation (PWM) amplifier of the type including power transistors connected in totem-pole fashion and a bootstrap capacitor used to bias at least one of the power transistors into the conductive state. The improvement wherein the bootstrap ... | 06/12/2001 |
| 6208216 | Phase-locked-loop pulse-width modulation system A phase-locked loop applied as a phase modulator using an external analog control signal whereby a single-ended pulse-width modulated digital signal may be derived from the phase detector output, and two phase modulated square-wave digital signals may be ... | 03/27/2001 |
| 5963106 | Double-sided pulse width modulator In a double-sided pulse width modulator, an amplifier has a first input connected to a first reference potential, a second input, and an output. A first bank of storage elements have a first terminal connected to the second input of the amplifier, and a s... | 10/05/1999 |
| 5943366 | Method of generating A.C. information for a bus system, and transmission unit for carrying out the method Method and device for generating bit information in a subscriber station of a bus system, in particular of the bus of the EIBA, essentially symmetrical AC voltage information being superposed as bit information on a DC voltage of the bus in that a DC volt... | 08/24/1999 |
| 5739711 | Regulation circuit for bipolar voltage switching circuits having logic circuitry using a single error amplifier for regulation of both positive and negative voltages A circuit suitable for use in a regulated bi-directional output power supply requiring controlled transitions between states, such as in a Battery Polarity Switch is provided to utilize many of the same circuit components in regulating both opposing polar... | 04/14/1998 |
| 5675297 | Integrated pulse-width modulation circuit with thermal shutdown circuit An integrated pulse-width modulation circuit with conditional temperature protection circuitry includes logic circuitry, a power output device, thermal shutdown circuitry to disable the power output device when the die temperature exceeds a predetermined ... | 10/07/1997 |
| 5565820 | Pulse width power supply modulator A pulse width modulation type power supply modulator capable of operating at high switching frequencies (>10 MHz) is achieved by eliminating resonant circuits which limit the maximal switching frequency. The modulator includes a power circuit including a ... | 10/15/1996 |
| 5481560 | Digital-to-pulse width converter utilizing a distributed pulse width A digital-to-analog converter includes a digital-to-pulse width converter that converts a desired digital set-point value to a corresponding signal having a pulse width indicative of the desired set-point value. The desired set-point value is fed to a com... | 01/02/1996 |
| 5457435 | Pulse width modulated driver The present invention an apparatus provides a pulse width modulated signal to a load in response to an input signal. The apparatus receives the input signal and a feedback signal, determines a difference between the received signals, integrates the differ... | 10/10/1995 |
| 5438303 | Pulse with modulation apparatus with plural independably controllable variable delay devices A pulse width modulation apparatus outputs an output pulse having an arbitrary width with respect to an arbitrary point in a pulse period. A delay means associated with a pulse cycle have multi-stage delay output means. Before a control pulse CLKP is fed ... | 08/01/1995 |
| 5428321 | Pulse width modulator having controlled delay circuit A pulse width modulation circuit apparatus of a digital type using a delay circuit and a decoder, which is provided with a delay control circuit for driving the reset-set type flip-flop of a last output stage and which provides the flip-flop with a mode d... | 06/27/1995 |
| 5361048 | Pulse width modulator having a duty cycle proportional to the amplitude of an input signal from a differential transducer amplifier A pulse width modulator generates a linear sawtooth ramp waveform from a pulse signal to compare against an amplified input signal derived from a transducer output voltage signal. A first circuit generates the linear ramp waveform in response to the pulse... | 11/01/1994 |
| 5231363 | Pulse width modulating producing signals centered in each cycle interval A pulse width modulating circuit including a shift register and a subtraction circuit, with first and second binary counters respectively connected to the outputs of the shift register and the subtraction circuit, and a logic circuit connected to the outp... | 07/27/1993 |
| 5038051 | Solid state modulator for microwave transmitters A switching modulator for a microwave radar transmitter is presented. In embodiment, a string of series connected transistors is controlled from an external source for pulse modulating the cathodes of transmitter microwave tubes. The individual componen... | 08/06/1991 |
| 4875222 | Information signal transmission system by predictive differential coding An information signal transmission system for transmitting a code sequence in which mutually adjoining codes are correlated with each other. The information signal transmission system is arranged to compute a predictive code for each code sequence by usin... | 10/17/1989 |
| 4831344 | IC output circuit for use in pulse width modulator According to the present invention, an output transistor on the power supply side Vcc is composed of an NPN type transistor whose base is driven by a PNP type transistor with a diode in its collector-to-emitter path to prohibit its saturation. Another out... | 05/16/1989 |
| 4776036 | RF-AM transmitter with pulse width modulator An RF-AM transmitter includes a pulse amplifier responsive to a pulse width modulated (PWM) signal derived in response to an information signal. A low pass filter converts pulses derived by the power amplifier into a variable amplitude signal that is DC c... | 10/04/1988 |
| 4742316 | Pulse-width modulator A pulse-width modulator comprising a square-wave generator which triggers a monostable multivibrator driven by a controllable constant current source, the multivibrator having a capacitor as a timing element. The output of the multivibrator controls a gat... | 05/03/1988 |
| 4603301 | Amplitude insensitive delay lines in a frequency modulated signal detector A circuit for detecting a Frequency Modulated (FM) signal is provided. An amplitude limited FM signal is propated through a delay circuit comprising a plurality of cascaded saturating inverters. A Boolean logic "Exclusive Or" (XOR) operation is performed ... | 07/29/1986 |
| 4580064 | Method for generating pulse width modulated control signals A method for generating pulse width modulated (PWM) control signals from a reference waveform uses a unipolar timing waveform to modulate the reference waveform thereby avoiding the need for lock-out intervals to prevent shoot-through in power inverters s... | 04/01/1986 |
| 4549151 | Pulse width modulator circuit with thermal breakdown prevention A pulse width modulator circuit includes a first comparator comparing an input signal with a sawtooth wave signal, a second comparator comparing a reference voltage with the sawtooth wave signal, an AND circuit receiving the outputs from the first and sec... | 10/22/1985 |
| 4524335 | Pulse-width modulation circuit with carrier signal frequency control A pulse-width modulation circuit detects a signal level or amplitude of an audio signal by means of an absolute value detecting circuit. The detected level is applied to a control terminal of a voltage-controlled oscillator. The output of the voltage-cont... | 06/18/1985 |
| 4508975 | Pulse duration modulator using charge coupled devices Pulse-duration-modulated signal is generated from samples of an analog signal voltage in a CCD device by fill-and-spill input of charge into the CCD device, scooping of fixed unit charge to generate a pulse train with pulses in a number proportional to th... | 04/02/1985 |
