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JP3366677B2 |
An audio amplifier output stage comprises first and second solid state devices, each having a controlled current conducting path comprising first and second terminals and a controlling current conducting path, comprising at least a third...
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JP2002544748A |
A method is proposed for influencing the electrical power of a load with the assistance of a pulse-width modulated signal, the latter including the requirement of a continuous turn-on signal. The method provides that the continuous turn-...
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JP2002353789A |
To obtain a pulse width modulation system that can enhance a transmission efficiency and a recording efficiency of data. The pulse width modulation system is provided with a means that applies Fourier transform to a signal to be modulate...
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JP3350010B2 |
The present invention provides a three-phase pulse width modulation waveform generator having at least an up-down counting circuitry which comprises: an up-down counter for performing an up-count or a down-count upon an external input of...
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JP2002325459A |
To set an upper/lower limit value of duty cycle of pulse width modulation, without checking the value set in a register by a software without using a separate hardware, in a pulse width modulation signal generator circuit.A pulse width m...
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JP2002325460A |
To easily restrain leakage of a carrier power signal to a load side.This PWM modulation device subjects an input digital signal S1 to pulse width modulation (PWM), to generate a pair of PWM power signals S7, S15 mutually in a complementa...
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JP3342044B2 |
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JP3333883B2 |
To provide a PWM controller for 3-level inverter in which the output voltage can be controlled continuously and faithfully to an instantaneous voltage command by regulating the width of voltage pulse on the reverse polarity side in the d...
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JP2002290219A |
To provide a pulse width modulation system that can enhance transmission efficiency and recording efficiency of data.The pulse width modulator is provided with a period detection means that measures the period of a signal to be modulated...
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JP3326887B2 |
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JP3326619B2 |
A pulse width modulation circuit apparatus comprises delay gates, delay circuits and an A/D converter. The delay gates are connected in cascade fashion and delay an input clock signal by the same delay time with each delay gate. The dela...
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JP3326890B2 |
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JP3326888B2 |
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JP3323101B2 |
To realize a PWM f converter of high precision and a low cost by taking the power source of a filter circuit and a circuit concerning the CR time constant of an oscillation circuit part from the same power source so as to improve a pulse...
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JP3323124B2 |
To provide the modulation method and system where a carrier frequency is reduced without increasing the amount of arithmetic processing. A carrier shift section 12 shifts a frequency band of an output signal of a signal point generating ...
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JP2002252527A |
To provide a method and a circuit for compensating a pulse width modulation(PWM) signal.The circuit is provided with a sigma-delta modulator 11 for receiving an N-bit digital signal; a pulse width modulator 12 which is connected with the...
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JP2002223151A |
To provide a modulator that has a simple structure using no logic gate and a delay cell and processes a differential signal with a very high frequency.The pulse width modulator is provided with 1st and 2nd transistors(TRs) T1, T2 whose c...
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JP3304752B2 |
To demodulate modulation data with a wide allowable margin dynamically with respect to pulse width distortion of high frequency data only when the frequency of the modulation data changes from a low frequency into a high frequency. This ...
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JP3302907B2 |
To realize an output controlling circuit, which can increase an output accuracy and simultaneously and individually control a plurality of outputs, and which has a simple circuit configuration, thereby minimizing the factors which cause ...
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JP3303104B2 |
To shorten the tracing time of the cause of the failure of a switching element largely by stopping the update of monitor data and reproducing the data when a failure accident occurs. When a microcomputer 21 is accessed to a specified add...
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JP3298959B2 |
PURPOSE: To easily provide a pulse width modulating circuit by a simple constitution by adjusting a time difference generated between set and reset pulses generated at the same time difference by a unit pulse. CONSTITUTION: The pulse wid...
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JP3297242B2 |
PURPOSE: To provide a pulse width modulator(PWM) which can directly accept data from the bus of a data processor in a simple configuration according to input data of two's completion. CONSTITUTION: A PWM 20 receives a two's complement in...
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JP2002519989A |
Systems and methods can provide, in one aspect, a method for modulating the pulse width of control signals generated on a plurality of separate channels. In one practice, the methods described herein are suitable for execution on a micro...
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JP2002186250A |
To provide a pulse width modulation(PWM) power supply control system having smooth control characteristics over the entire duty ratio range.The pulse width modulation(PWM) power supply control system employs a peak current program mode(C...
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JP2002171140A |
To prevent an output transistor from thermal breakdown due to an overcurrent caused by an output short circuit of a class D audio amplifier.The amplifier output circuit comprises protection control circuits 11, 12, 21, 22 which detect po...
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JP3286962B2 |
PURPOSE: To calculate required data by an adder, which is a hardware, and generate a plurality of PWM signals at high frequencies. CONSTITUTION: The on-width data of a PWM1 signals is fetched from an 8-bit latch 3 and then it is set on a...
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JP3284317B2 |
PURPOSE: To easily set the duty ratio from 0% to 100%. CONSTITUTION: A pulse width modulating device 30 consists of a counting circuit 32 which outputs an overflow signal at the tinge of return from the final value to the initial value, ...
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JP2002141789A |
To provide a PWM signal generating circuit which employs as small number of components as possible and is which a required volume for final circuit mounting is remarkably reduced.A DC/DC conversion circuit 10 is a circuit widely spread a...
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JP2002124859A |
To provide a pulse width modulation circuit in which the output frequency or the minimum pulse width is kept constant even at the time of pulse width modulation.The pulse width modulation circuit comprises means for generating a pulse de...
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JP2002511988A |
A method of and apparatus for the conversion of a frequency modulated signal to a digital output are disclosed. The output of the converter is a triangularly weighted sum of the number of zero crossings of the F.M. signal in each sub-sam...
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JP2002100488A |
To generate a pulse signal for highly accurately controlling pulse width.This discharge lamp lighting control pulse generator is provided with an A/D converter 2 for performing A/D conversion on a control signal, a register 3 for setting...
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JP2002096503A |
To obtain a multichannel pulse width modulator in which operational reliability can be prevented from lowering due to simultaneous rising of PWM signals.When a PWM signal 48m is generated from PWM generators 50m (m=1-M), where M is the n...
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JP3265783B2 |
PURPOSE: To control fluctuation of a frequency output small by compensating a delay or a lead of time of a comparator due to a change in temperature. CONSTITUTION: An integrating circuit 1 constructed of an operational amplifier A1 of wh...
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JP3262760B2 |
To provide a delta-sigma pulse width modulator adapted for mounting in a digital integrated circuit by reducing the harmonic noises. This delta-sigma pulse width moldulator control circuit 103 adopts a delta-sigma modulator 201 as a firs...
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JP2002506308A |
In a method and an amplifier for the compensation of unlinearities e.g. of the class D type, wherein an audio signal is pulse-width modulated, e.g. with a carrier wave signal in the form of a triangular signal to provide a pulse-width mo...
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JP3254897B2 |
PURPOSE: To measure very small measured voltage more accurately by providing a resistor between an output terminal of a triangle wave generator and ground so as to attain the voltage outputted from the triangle wave generator with excell...
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JP3253349B2 |
PURPOSE: To provide the pulse-width modulation circuit (PWM circuit), of a power supply for a laser, wherein its response is fast, its switching loss is small and its instruction pulse is output with fidelity. CONSTITUTION: The title mod...
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JP2002503051A |
A modulator loop designed to operate in a frequency range of interest is described. The loop includes a loop output terminal and a switching stage, the output of which is coupled to the loop output terminal. The switching stage has a fir...
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JP2002017089A |
To enhance controlling performance, including following property and stability, to the characteristics and operation modes of a load.A digital PWM control circuit 1B, including an error amplifier, of digital control type is composed of a...
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JP2002009596A |
To provide a PWM(pulse width modulation) signal generating circuit from which a component to realize 0% to 100% duty ratio is eliminated.The PWM signal generating circuit uses a count means 102 of n-bit configuration (n is a positive rea...
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JP2002500832A |
(57) [Summary] Ultrashort pulse time hopping code division multiple access (CDMA) and time division multiple access (TDMA) RF, IR, and optical communication systems (20,30) in the time frequency domain (60) are in the femtosecond to micr...
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JP3243796B2 |
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JP2001350439A |
To make the relation between luminance data and light emission luminance of LEDs(light emitting diodes) match with the gamma characteristics of a CRT (cathode-ray tube) without increasing the number of bits of the luminance data and with...
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JP3236506B2 |
To provide a switching power supply which can provide a large allowable input voltage width with which stabilization is possible. This power supply 1 comprises a signal generating means 14 to generate a switching signal, a power converti...
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JP2001310501A |
To provide a system which enables a pulse width modulator to form video data to a laser at a frequency independent of an operating frequency.The system 10 is provided with a phase measurement circuit 32, an edge output decision circuit 3...
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JP2001520391A |
A voltage to frequency converter using a charge pump to restore the output voltage of the input integrator. The charge pump implementation allows the voltage to frequency converter's input to sense voltage above and below ground with a s...
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JP3221633B2 |
PURPOSE: To obtain a programmable and controllable variable timing generating circuit. CONSTITUTION: A programmable and controllable timing circuit(CTC) is formed on an integrated circuit chip(IC) having a TAP access pin(TAP) incorporati...
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JP2001285044A |
To provide a digital pulse generator, capable of adjusting an output between a set minimum section and a set maximum section. This generator consists of a counter circuit CT1 for the maximum section, a counter circuit CT2 for the minimum...
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JP3215108B2 |
A variable width pulse generator includes a plurality of logic stages which are coupled in cascade. Each stage is arranged to select one of a plurality of clock signals of differing phase applied thereto responsive to particular bits of ...
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JP2001268359A |
To realize a circuit for generating a PWM signal capable of obtaining arbitrary multiple resolution for a reference clock, or controlling rising and falling in an arbitrary timing.This PWM circuit for generating a PWM signal upon receivi...
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