Oscillator having output frequency linearly related to resistance
阅读：354发布：2022-01-07
专利汇可以提供Oscillator having output frequency linearly related to resistance专利检索，专利查询，专利分析的服务。并且An oscillator includes an operational integrator, a Schmitt trigger, and an operational amplifier connected in series and in a closed feedback loop. The oscillator frequency is directly proportional to the resistance in the negative feedback path of the operational amplifier. The oscillator is ideally suited as a tone generator in a musical instrument wherein the amplifier feedback resistance is changed as each key switch is actuated. The oscillator is also disclosed for use as an ohm meter whereby a resistance to be measured is placed in the amplifier feedback path and the corresponding oscillator frequency is monitored as a measure of the resistance.，下面是Oscillator having output frequency linearly related to resistance专利的具体信息内容。
1. An oscillator including a closed loop circuit having a net phase shift which is an odd multiple of 180* around said loop, said oscillator comprising: A Schmitt trigger of the type having means for establishing first and second threshold levels, an input terminal, and an output terminal for providing a signal at a first output level when the signal amplitude at said input terminal rises above said first threshold level and at a second output level when the signal amplitude at said input terminal falls below said second threshold level; a first operatinal amplifier including an input terminal, an output terminal, a resistivE negative feedback path connected between said output and input terminals of said amplifier, a gain which is linearly related to the resistance of said negative feedback path, and resistive means coupling the signal from the output terminal of said Schmitt trigger to the input terminal of said amplifier; and an integrator circuit including input means for receiving signal from the output terminal of said amplifier and output means for providing an output signal which corresponds to the integral of the signal received by said input means and for applying said output signal to the input terminal of said Schmitt trigger: wherein the output signal provided by said integrator circuit has a substantially triangular waveform with waveform transistions occuring at said first and second threshold levels.
2. The oscillator according to claim 1 wherein said resistive negative feedback path for said operatinal amplifier comprises a plurality frequency-determinative circuits connected in parallel between the output and input terminals of said operational amplifier, each frequency determinative circuit comprising a switch and a resistor connected in series.
3. The oscillator according to claim 2 employed as a tone generator for a musical instrument and wherein said switches are normally open and the resistances of said frequency-determintive circuits are related in the same manner as the notes of a musical scale.
4. The oscillator according to claim 1 wherein said resistive negative feedback path includes an adjustable resistance.
5. The oscillator according to claim 1 wherein said resistive negative feedback means comprises a potentiometer connected between said output and input terminals of said operational amplifier.
6. The oscillator according to claim 1 employed as an ohmmeter, wherein the resistive negative feedback path for said operational amplifier is a resistance to be measured, and further comprising means for measuring the frequency of said oscillator when said resistance to be measured is connected between the output and input terminals of said operational amplifier.
7. The oscillator according to claim 1 wherein said Schmitt trigger comprises: a second operational amplifier having an inverting input terminal corresponding to the Schmitt trigger input terminal, a non-inverting input terminal, and an output terminal corresponding to the output terminal of said Schmitt trigger; and a voltage divider connected between said output terminal of said second operational amplifier and ground with a voltage division point on said voltage divider connected to said non-inverting input terminal.
8. The oscillator according to claim 7 wherein said resistive negative feedback path for said operational amplifier comprises a plurality frequency-determinative circuits connected in parallel between the output and input terminals of said operational amplifier, each frequency determinative circuit comprising a switch and a resistor connected in series.
9. The oscillator according to claim 7 employed as an ohmmeter, wherein the resistive negative feedback path for said operational amplifier is a resistance to be measured, and further comprising means for measuring the frequency of said oscillator when said resistance to be measured is connected between the output and input terminals of said operational amplifier.
10. The oscillator according to claim 7 wherein said integrator circuit comprises an operational integrator including: a third operational amplifier with an inverting input terminal and an output terminal; a capacitor connected between the output and inverting input terminals of said third operational amplifier; and a resistor connected in series between said first operational amplifier and the inverting input terminal of said third operational amplifier.
11. The oscillator according to claim 10 wherein said resistive negative feedback path for said opertional amplifier comprises a plurality frequency-determinative circuits connected in Parallel between the output and input terminals of said operational amplifier, each frequency determiniative circuit comprising a switch and a resistor connected in series.
12. The oscillator according to claim 10 employed as an ohmmeter, wherein the resistive negative feedback path for said operational amplifier is a resistance to be measured, and further comprising means for measuring the frequency of said oscillator when said resistance to be measured is connected between the output and input terminals of said operational amplifier.
13. An oscillator having a frequency which is variable over a known frequency range, said oscillator comprising: an integrator having an input terminal and an output terminal; a Schmitt trigger circuit having an input terminal and an output terminal; an operatinal amplifier having an input terminal and an output terminal, said operational amplifier including a resistive negative feedback path and means for controllably varying the gain of said operational amplifier by selectively varying the resistance of said negative feedback path; means connecting the output terminal of said operational amplifier to the input terminal of said integrator; means connecting the output terminal of said integrator to the input terminal of said Schmitt trigger; and means connecting the output terminal of said Schmitt trigger to the input terminal of said operational amplifier.
14. An oscillator comprising: an integrator including: a first phase-inverting operational amplifier having an input terminal and an output terminal; input resistor means for coupling signal to said input terminal; and capacitor means connected in negative feedback relationship between said output and input terminals; A schmitt trigger circuit including: a second phase-inverting operational amplifier having inverting and non-inverting input terminals and an output terminal; a resistive positive feedback path connected between the output and non-inverting input terminals of said second amplifier; and a resistive reference path connected between the non-inverting input terminal of said second amplifier and a source of reference potential; means coupling the output terminal of said first amplifier to the inverting input terminal of said second amplifier; a third phase-inverting operational amplifier having input and output terminals, a resistive negative feedback path connected between said output and input terminals of said third amplifier; resistive coupling means connected between the output terminal of said second amplifier and the input terminal of said third amplifier; means connecting the output terminal of said third amplifier to the input terminal of said first amplifier through said input resistor means; and means for controllably varying the frequency of said oscillator by varying the resistance of said resistive negative feedback path for said third amplifier.
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