component. The calculator will then Slew rates must be known and taken into account unless dealing with very low frequencies and voltages. More particularly, numerous variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. but its composition of an inductor and capacitor is the same for each Referring to FIG. This discharges the capacitor. In one embodiment, by way of non-limiting example, a resistor-capacitor (RC) oscillator, comprises: a voltage transforming unit for transforming a power supply voltage to an internal voltage; a current mirroring unit coupled to the voltage transforming unit and being configured to receive the internal voltage to provide constant two current outputs with different phases; a current charging/discharging unit including first and second nodes to receive the two constant current outputs of the current mirroring unit; first and second capacitors coupled to the first and second nodes, respectively, to be charged by the two constant current outputs; a voltage sensing and outputting unit coupled to the first and second nodes and being configured to sense voltage levels of the first and second nodes and output clock signals when one of the sensed voltage levels is greater than a logic threshold; and a pulse generating unit for generating pulse signals in response to the clock signals, wherein the current charging/discharging unit further includes a connection switch to electrically connect the first and second nodes in response to the pulse signals.The Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. With a resistor and capacitor in the same circuit, oscillations are produced.
As stated, RC circuits may be built with an op amp, a transistor, or inverter logic chip, This application is a continuation of U.S. patent application Ser. United States Patent Application 20100013566 . So, although op amps can work well as oscillators, certain criteria such as frequency and voltage levels must be taken into account. at which the op amp can output voltage. The values of the three RC ladder network capacitors C1, C2, and C3 are equal as are the values of the the three resistors R5, R2, and R3. combined together. RC circuits can be used to filter a signal by blocking certain frequencies and passing others. For frequencies 100MHz or greater, capacitors in the picofarads and an inductor in the nanohenries is used. The PICmicros™ internal oscillator circuit is a parallel oscillator circuit, which requires that a par- allel resonant crystal be selected. Therefore, this calculator can be used for any LC circuit. Resistors are usually easily accessible regardless of value, because they are such a widely used It's not all perfect. Large capacitor values are usually very hard to find. In fact, in this calculator, The rest of inductors are smaller, which is much more easily accessible. LC circuit will remain unchanged. and capacitor. Just like an RC circuit, oscillations are produced. United States Patent Application 20100013566 . Abstract: An embodiment for low power-consumption RC oscillator is disclosed. 12/713,069, now U.S. Pat. In turn, there is an oscillatory waveform at the output of the op amp directly in proportion to the RC network. As the value of the frequency increases, the values of the capacitor and resistor get much smaller. capacitance range of 1pF to 4700μF. The clock generator logic is configured to generate a clock signal based on the comparison, such that a frequency of the clock signal is a function of the ratio and is independent of the current and the comparator threshold voltage.a current generator configured to generate a current proportional to a comparator threshold voltage by a ratio, including an inverter configured to have an equal voltage at an input and an output to generate the comparator threshold voltage;a capacitor configured to be charged by the current to have a capacitor voltage;a comparator configured to compare the capacitor voltage with the comparator threshold voltage;a switch configured to discharge the capacitor based on the comparison; anda clock generator logic configured to generate a clock signal based on the comparison, such that a frequency of the clock signal is a function of the ratio and is independent of the current and the comparator threshold voltage.a resistor module with the comparator threshold voltage applied on the resistor module.a first resistance portion configured to have a positive temperature coefficient; anda second resistance portion in series with the first resistance portion, the second resistance portion being configured to have a negative temperature coefficient.a metal-oxide-semiconductor transistor configured to have a turn-on resistance of a negative temperature coefficient.equalizing a voltage level at an input and an output of an inverter to generate a comparator threshold voltage;generating a current proportional to the comparator threshold voltage by a ratio;charging a capacitor by the current to generate a capacitor voltage;comparing the capacitor voltage with the comparator threshold voltage;discharging the capacitor when the comparison indicates the capacitor voltage is larger than the comparator threshold voltage; andgenerating a clock signal based on the comparison, such that a frequency of the clock signal is a function of the ratio and is independent of the current and the comparator threshold voltage.applying the comparator threshold voltage on a resistor module.combining a first resistance portion having a positive temperature coefficient with a second resistance portion having a negative temperature coefficient in the resistor module.using a metal-oxide-semiconductor transistor configured to have a turn-on resistance of a negative temperature coefficient in the resistor module.providing the capacitor voltage as an input to a second inverter.a current generator configured to generate a current proportional to a comparator threshold voltage by a ratio, including an inverter configured to have an equal voltage at an input and an output to generate the comparator threshold voltage;a capacitor configured to be charged by the current to have a capacitor voltage;a comparator configured to compare the capacitor voltage with the comparator threshold voltage;a switch configured to discharge the capacitor based on the comparison; anda clock generator logic configured to generate a clock signal based on the comparison, such that a frequency of the clock signal is a function of the ratio and is independent of the current and the comparator threshold voltage.a resistor module with the comparator threshold voltage applied on the resistor module.a first resistance portion configured to have a positive temperature coefficient; anda second resistance portion in series with the first resistance portion, the second resistance portion being configured to have a negative temperature coefficient.a metal-oxide-semiconductor transistor configured to have a turn-on resistance of a negative temperature coefficient.Generating pulses having essentially a finite slope or stepped portionsGenerating pulses having essentially a finite slope or stepped portions having triangular shapeGenerating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shapeGenerating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devicesGenerating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitorGenerating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g.
As stated, RC circuits may be built with an op amp, a transistor, or inverter logic chip, This application is a continuation of U.S. patent application Ser. United States Patent Application 20100013566 . So, although op amps can work well as oscillators, certain criteria such as frequency and voltage levels must be taken into account. at which the op amp can output voltage. The values of the three RC ladder network capacitors C1, C2, and C3 are equal as are the values of the the three resistors R5, R2, and R3. combined together. RC circuits can be used to filter a signal by blocking certain frequencies and passing others. For frequencies 100MHz or greater, capacitors in the picofarads and an inductor in the nanohenries is used. The PICmicros™ internal oscillator circuit is a parallel oscillator circuit, which requires that a par- allel resonant crystal be selected. Therefore, this calculator can be used for any LC circuit. Resistors are usually easily accessible regardless of value, because they are such a widely used It's not all perfect. Large capacitor values are usually very hard to find. In fact, in this calculator, The rest of inductors are smaller, which is much more easily accessible. LC circuit will remain unchanged. and capacitor. Just like an RC circuit, oscillations are produced. United States Patent Application 20100013566 . Abstract: An embodiment for low power-consumption RC oscillator is disclosed. 12/713,069, now U.S. Pat. In turn, there is an oscillatory waveform at the output of the op amp directly in proportion to the RC network. As the value of the frequency increases, the values of the capacitor and resistor get much smaller. capacitance range of 1pF to 4700μF. The clock generator logic is configured to generate a clock signal based on the comparison, such that a frequency of the clock signal is a function of the ratio and is independent of the current and the comparator threshold voltage.a current generator configured to generate a current proportional to a comparator threshold voltage by a ratio, including an inverter configured to have an equal voltage at an input and an output to generate the comparator threshold voltage;a capacitor configured to be charged by the current to have a capacitor voltage;a comparator configured to compare the capacitor voltage with the comparator threshold voltage;a switch configured to discharge the capacitor based on the comparison; anda clock generator logic configured to generate a clock signal based on the comparison, such that a frequency of the clock signal is a function of the ratio and is independent of the current and the comparator threshold voltage.a resistor module with the comparator threshold voltage applied on the resistor module.a first resistance portion configured to have a positive temperature coefficient; anda second resistance portion in series with the first resistance portion, the second resistance portion being configured to have a negative temperature coefficient.a metal-oxide-semiconductor transistor configured to have a turn-on resistance of a negative temperature coefficient.equalizing a voltage level at an input and an output of an inverter to generate a comparator threshold voltage;generating a current proportional to the comparator threshold voltage by a ratio;charging a capacitor by the current to generate a capacitor voltage;comparing the capacitor voltage with the comparator threshold voltage;discharging the capacitor when the comparison indicates the capacitor voltage is larger than the comparator threshold voltage; andgenerating a clock signal based on the comparison, such that a frequency of the clock signal is a function of the ratio and is independent of the current and the comparator threshold voltage.applying the comparator threshold voltage on a resistor module.combining a first resistance portion having a positive temperature coefficient with a second resistance portion having a negative temperature coefficient in the resistor module.using a metal-oxide-semiconductor transistor configured to have a turn-on resistance of a negative temperature coefficient in the resistor module.providing the capacitor voltage as an input to a second inverter.a current generator configured to generate a current proportional to a comparator threshold voltage by a ratio, including an inverter configured to have an equal voltage at an input and an output to generate the comparator threshold voltage;a capacitor configured to be charged by the current to have a capacitor voltage;a comparator configured to compare the capacitor voltage with the comparator threshold voltage;a switch configured to discharge the capacitor based on the comparison; anda clock generator logic configured to generate a clock signal based on the comparison, such that a frequency of the clock signal is a function of the ratio and is independent of the current and the comparator threshold voltage.a resistor module with the comparator threshold voltage applied on the resistor module.a first resistance portion configured to have a positive temperature coefficient; anda second resistance portion in series with the first resistance portion, the second resistance portion being configured to have a negative temperature coefficient.a metal-oxide-semiconductor transistor configured to have a turn-on resistance of a negative temperature coefficient.Generating pulses having essentially a finite slope or stepped portionsGenerating pulses having essentially a finite slope or stepped portions having triangular shapeGenerating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shapeGenerating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devicesGenerating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitorGenerating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g.