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7612623 |
Micropower RC oscillator
A micropower RC oscillator comprises a current generating section including a current source that generates a current; and a variable resistor of which the magnitude is variably set and which is...
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7602258 |
Circuits, systems, and methods for a voltage controlled oscillator with coarse, fine, and center tuning
Circuits, systems, and methods for generating a variable oscillator output. The circuits generally comprise a capacitor configured to receive first and second currents of a first polarity (e.g.,...
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7598822 |
Process, supply, and temperature insensitive integrated time reference circuit
Precision integrated time reference circuits are disclosed. Preferred embodiments provide time reference circuits that are relatively insensitive to variations in process, supply, and temperature....
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7579918 |
Clock generator with reduced electromagnetic interference for DC-DC converters
A clock generator includes a current source for generating a constant current; a current mirror coupled between a supply voltage and the current source for generating a mirror current equal to the...
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7551041 |
Oscillator and method for operating an oscillator
An oscillator is provided that includes at least one capacitor, at least one comparator, and at least one device for charging or discharging the at least one capacitor. The capacitor is coupled to...
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7548131 |
Oscillation circuit with temperature-dependent current source
An output signal ZA of NAND 48 a is given to a first input of NAND 48 b and is given to a second input of the above NAND 48 b , simultaneously through a delay circuit. Furthermore, an output...
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7538629 |
Oscillator circuit
The invention provides an oscillator circuit that reduces the dependence of an oscillation frequency on a power supply voltage. A charging and discharging circuit is a circuit switchable between an...
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7528673 |
Oscillator circuit and semiconductor device having oscillator circuit
An oscillator circuit having a closed loop connection, including: an oscillator for generating an output signal oscillating at a frequency corresponding to a control signal; a frequency/voltage...
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7525394 |
Ultra low power CMOS oscillator for low frequency clock generation
An ultra low power relaxation CMOS oscillator for low frequency clock generation comprises a current source and a pair of capacitors that are alternatingly charged by the current source and...
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7504902 |
Precision oscillator having linbus capabilities
The integrated system on a chip with LINBUS network communication capabilities includes processing circuitry for performing predefined digital processing functionalities on the chip. A free running...
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7504897 |
Switched-current oscillator for clock-frequency spreading
A switched-current oscillator having a dc current source adapted to charge a capacitor so that the capacitor charging time is controlled based on a sequence of (pseudo)randomly selected values,...
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7486151 |
Semiconductor circuit for use in timer circuit or oscillator circuit
In a timer circuit of a semiconductor circuit including a current source driven by a power supply voltage, the current source outputs a current dependent on the power supply voltage, and outputs a...
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7486150 |
Electric circuit and oscillator comprising said electric circuit
An electric circuit includes a circuit path from a first reference voltage to a second reference voltage lower than the first reference voltage. The path includes a current generator, a capacitor,...
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7474162 |
RC-oscillator circuit
An RC oscillator circuit is disclosed. The RC oscillator circuit includes a current generator configured to generate a charge current. The RC oscillator circuit also includes an integrator having...
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7443255 |
Oscillator circuit and method for adjusting oscillation frequency of same
An oscillator comprises a data storage unit, an oscillation unit, and a control unit. The data storage unit is adapted to store a plurality of reference condition codes and a plurality of reference...
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7443254 |
Relaxation oscillator with propagation delay compensation for improving the linearity and maximum frequency
A tunable oscillator comprises a control supply configured to output a control output operable to tune the tunable oscillator. The tunable oscillator further comprises an oscillator circuit...
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7439818 |
Voltage-and temperature-compensated RC oscillator circuit
An integrated temperature-compensated RC oscillator circuit includes an inverter having an input and an output. An RC network is coupled between the inverter and a pair of comparators. A first...
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7420431 |
RC oscillator integrated circuit including capacitor
An RC oscillator integrated circuit includes: an active current mirror connected to an external resistor, for receiving a current signal corresponding to a voltage signal applied to the external...
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7388444 |
Switching regulator duty cycle control in a fixed frequency operation
A clock oscillator system for use in providing the switching regulator duty cycle control in a fixed frequency (no cycle skipping) operation is provided. In one embodiment, the circuit according to...
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7385453 |
Precision oscillator having improved temperature coefficient control
A free running clock circuit includes a switching circuit for switching between first and second logic states at a predetermined frequency based upon a trip voltage the switching circuit has a...
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7375599 |
Analog circuit and method for multiplying clock frequency
A signal generating circuit includes a relaxation oscillator operating to alternately generate a first ramp signal that is periodic at a frequency of the relaxation oscillator and a second ramp...
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7348860 |
Triple-input relaxation oscillator with differential controllability
There are provided relaxation oscillators and methods for controlling the same. A relaxation oscillator includes a load device, a switching device, a fine-tuning varactor, and a current source. The...
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7342463 |
Timer circuits and method
A timing circuit operates by applying an arbitrary voltage across a resistance, and using the resulting current to generate a charging current which charges and/or discharges a capacitance to an...
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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...
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7307481 |
Minimum synchronization frequency discriminator
A minimum frequency synchronization discriminator for use in providing a clock signal for a switch mode power supply automatically detects when the frequency of a sync signal is above a minimum...
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7280000 |
Apparatus and method for reducing power consumption within an oscillator
An oscillator according to the present invention reduces power consumption by enlarging the pulsewidth of an oscillator output pulse. Since this pulse disables an oscillator current source, the...
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7274265 |
PWM controller with temperature regulation of switching frequency
A circuit for controlling the switching frequency of an oscillator for a PWM controller for a switching mode power supply, comprising a first stage providing a signal which is related to the...
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7271670 |
CR oscillation circuit
A CR oscillation circuit comprises first and second logic elements, a capacitive element, and a resistive element. The first logic element is connected between a first node and a second node. The...
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7268639 |
Pulse width modulation circuit
The present invention provides a pulse width modulation (PWM) circuit comprising an PWM control circuit for setting an output signal to low when a logical level of a oscillation signal at a first...
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7248634 |
Integrated circuit for transceiver device with means for suppressing superimposed noise and for generating a more accurate output signal
A serial communication transceiver includes a trapezoidal wave signal generation circuit for producing a trapezoidal wave signal responsive to a control signal. The trapezoidal wave signal...
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7199676 |
Frequency adjustment circuit
A frequency adjustment circuit that maintains a target frequency even when frequency adjustment data of zapping circuit is changed by an external noise is offered. The frequency adjustment circuit...
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7187244 |
Digital light ballast oscillator
An oscillator for a power converter control outputs a pulse train based on a charging time of a capacitor linked to a variable current source. A digital to analog converter (DAC) controls the...
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7176765 |
Programmable temperature-compensated RC oscillator
An on-chip oscillator generates a substantially temperature-independent clock signal by compensating for temperature-induced changes in its RC time constant and in a range between trigger voltages....
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7171183 |
Linearized fractional-N synthesizer having a current offset charge pump
A linear fractional-N synthesizer includes phase and frequency detection module, a charge pump circuit, a loop filter, a voltage controlled oscillator, and a fractional-N divider. The phase and...
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7167060 |
Oscillation circuits including latches for integrated circuit devices and related methods
An oscillator circuit may include a latch circuit, a feed-back circuit, and an input circuit. The latch circuit may be configured to generate an oscillating output signal responsive to first and...
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7164326 |
Oscillator circuit
The oscillator circuit comprises an oscillator including an oscillating transistor through which an oscillating current flows; a first mirror transistor where the source/drain of which is grounded...
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7142069 |
Method and circuit arrangement for amplitude regulation of an oscillator signal
A circuit arrangement for controlling an amplitude of an oscillator signal is accomplished by comparing the oscillator signal to reference signals. The amplitude of the oscillator signal is capable...
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7138880 |
Turbo-charged relaxation oscillator method and apparatus
A method for producing an oscillating signal comprises: generating an oscillating signal by discharging after charging to a high trigger level and charging after discharging to a low trigger level;...
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7135937 |
Oscillator circuit and integrated circuit incorporating the same
The oscillator circuit comprises a capacitor and first to fourth constant current supplies and switches are connected to the capacitor. Both terminals of the capacitor are used for charges and...
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7123110 |
Low power self refresh timer oscillator
A low power oscillator circuit for a self-refresh timer in a memory array is disclosed. When a voltage (V 1 ) of a comparison node (N 1 ) exceeds a first reference voltage (Vref 1 ), a differential...
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7119626 |
Oscillation circuit and operation method thereof
An oscillation circuit has: a first MOS transistor having a gate connected to a first node and a source connected to the ground; a second MOS transistor having a gate connected to a second node and...
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7116181 |
Voltage- and temperature-compensated RC oscillator circuit
An integrated temperature-compensated RC oscillator circuit includes an inverter having an input and an output. An RC network is coupled between the inverter and a pair of comparators. A first...
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7109804 |
Precision relaxation oscillator without comparator delay errors
A relaxation oscillator for generating an oscillator output signal having a predetermined frequency. The relaxation oscillator includes an interleaved charge pump for providing a restoring charge...
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7102452 |
Temperature-compensated RC oscillator
An on-chip oscillator generates a substantially temperature-independent clock signal by compensating for temperature-induced changes in its RC time constant and in a range between trigger voltages....
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7068116 |
Oscillation circuit and semiconductor device free from the influence of source voltage, temperature and fluctuations in the inverter threshold voltage
An oscillation circuit capable of outputting an oscillation signal of constant frequency free from the influence of source voltage, temperature, and nonuniformity and fluctuation in inverter...
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7053724 |
Dual slope dual range oscillator
A dual range oscillator provides two different ranges of oscillator frequency output based on switched current sources charging a capacitor. As several current sources are combined to charge...
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7034627 |
Oscillator circuit with variable reference voltage and current
A relaxation oscillator circuit is configured to provide an output signal. The relaxation oscillator circuit includes two capacitors that are alternatively charged and discharged. Each capacitor is...
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7030707 |
Oscillator circuits and methods that change frequency in inverse proportion to power source voltage
An oscillator includes a comparison voltage generating circuit, a comparing circuit and a clock switching circuit. The comparison voltage generating circuit is driven by a power source voltage, and...
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7026882 |
Time base circuit, oscillator based thereon, and communicating apparatus using said oscillator
A time base circuit, for an oscillator and apparatus, defines a time interval in terms of a time taken for a capacitor to charge from a reference voltage level to a detection voltage level. The...
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7023289 |
Programmable oscillator
A programmable oscillator comprises a capacitor; a current generator couplable to said capacitor that generates a charging current of said capacitor; further comprising at least one resistance...
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