Integrated circuit oscillator with high voltage feedback network
First Claim
Patent Images
1. An oscillator circuit comprising:
- an amplifier having an input and output; and
a feedback network, operatively coupled to said amplifier, comprising means for generating an internal voltage greater than a voltage at said input and output, wherein said internal voltage is coupled to a position responsive electrographic apparatus.
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Abstract
An oscillator circuit having an amplifier and feedback loop multiplies a generated signal by appropriate selection of capacitance ratios in the feedback loop. In order to isolate this multiplied, high voltage signal, a voltage divider is used to isolate the high voltage portion from the input and output (I/O) of an integrated circuit oscillator core. The multiplied voltage creates a high voltage signal suitable for stylus signal transmission. The divided, and relatively low, voltage is used in the feedback path to stabilize the oscillator core'"'"'s operation.
38 Citations
21 Claims
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1. An oscillator circuit comprising:
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an amplifier having an input and output; and a feedback network, operatively coupled to said amplifier, comprising means for generating an internal voltage greater than a voltage at said input and output, wherein said internal voltage is coupled to a position responsive electrographic apparatus. - View Dependent Claims (2, 3)
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4. An oscillator circuit comprising:
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an amplifier; and a feedback network, having an output node and internal node and operatively coupled to said amplifier, comprising means for generating a voltage on said internal node that is greater than a voltage on said output node, wherein said internal node voltage is coupled to a position responsive electrographic apparatus. - View Dependent Claims (5, 6, 7)
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8. An oscillator circuit, comprising:
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an oscillator core having an input node and an output node; and a feedback network coupled between said input node and output node, said feedback network having at least one internal node and comprising voltage divider means for dividing a voltage such that a voltage on said input node is less than a voltage on said at least one internal node, wherein said internal node voltage is coupled to a position responsive electrographic apparatus. - View Dependent Claims (9)
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10. An oscillator circuit, comprising:
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an oscillator core having an input node and an output node; and a feedback network coupled between said input node and said output node, and comprising (i) an input capacitor coupled between said input node and ground and (ii) an isolation capacitor coupled between said input node and a high voltage node, wherein a voltage on said high voltage node is coupled to a position responsive electrographic apparatus. - View Dependent Claims (11, 12, 13)
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14. A circuit comprising an oscillator core having an input node and an output node, and a feedback network coupled between said input and output node, said feedback network comprising:
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an input capacitor coupled between said input node and ground; an output capacitor coupled between said output node and ground; an isolation capacitor coupled to said input node and a first node of an inductor; and a first capacitor coupled between a second node of said inductor and said output node of said oscillator, wherein a voltage on said first node is coupled to a position responsive electrographic apparatus. - View Dependent Claims (15, 16)
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17. A method for generating a high voltage signal in an oscillator circuit comprising an amplifier circuit and a feedback circuit, said method comprising the steps of:
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generating an amplifier circuit output voltage; generating a feedback circuit internal voltage greater than said amplifier circuit output voltage; generating a feedback circuit output voltage less than said feedback circuit internal voltage; and coupling said feedback circuit internal voltage to a position responsive electrographic apparatus.
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18. An electronic stylus, comprising:
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a body; an integrated circuit, within said body, comprising an oscillator circuit for generating an AC signal; and a voltage supply having an output voltage coupled to said integrated circuit, wherein the peak to peak voltage of said AC signal exceeds said output voltage. - View Dependent Claims (19)
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20. An electronic stylus, comprising:
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a body; and an integrated circuit, within said body, comprising an oscillator circuit for generating an AC signal, wherein said oscillator circuit comprises; an amplifier having an input and output; and a feedback network, operatively coupled to said amplifier, comprising means for generating an internal voltage greater than a voltage at said input and output.
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21. An electronic stylus, comprising:
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a body having a tip portion for transmitting an AC signal; an integrated circuit, within said body, comprising an oscillator circuit for generating said AC signal; and a voltage supply coupled to said integrated circuit, wherein peak-to-peak voltage of said AC signal exceeds said voltage supply voltage.
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Specification