Variable frequency oscillator with specialized inverter stages
First Claim
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1. A variable frequency oscillator device comprising:
- a first inverter stage having;
at least one capacitor having a parasitic capacitance to alternating current (AC) couple the first inverter stage to an output node;
a push pull circuit configured to generate a sawtooth signal for capacitive coupling to the output node by;
inverting an input signal, andcharging and discharging, responsive to a control signal, an oscillator capacitance predominantly derived from the parasitic capacitance of the at least one capacitor;
a second inverter stage to generate a first inverted signal from the output node of the first inverter stage, the second inverter stage including a resistive feedback path to, in response to changes in the control signal, change resistance values; and
a third inverter stage designed to generate a second inverted signal from the first inverted signal and to provide the second inverted signal as the input signal.
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Abstract
A variable frequency oscillator device includes a first inverter stage that is designed to invert an input signal to generate a sawtooth signal by charging and discharging a capacitor using current sources that each provides a respective amount of current that is responsive to a control signal and to a dampening signal. A second inverter stage is designed to generate a first inverted signal from the sawtooth signal of the first inverter stage. A third inverter stage is designed to generate a second inverted signal from the first inverted signal, and dampen a signal transition rate for the first inverted signal based upon the control signal.
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Citations
12 Claims
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1. A variable frequency oscillator device comprising:
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a first inverter stage having; at least one capacitor having a parasitic capacitance to alternating current (AC) couple the first inverter stage to an output node; a push pull circuit configured to generate a sawtooth signal for capacitive coupling to the output node by; inverting an input signal, and charging and discharging, responsive to a control signal, an oscillator capacitance predominantly derived from the parasitic capacitance of the at least one capacitor; a second inverter stage to generate a first inverted signal from the output node of the first inverter stage, the second inverter stage including a resistive feedback path to, in response to changes in the control signal, change resistance values; and a third inverter stage designed to generate a second inverted signal from the first inverted signal and to provide the second inverted signal as the input signal. - View Dependent Claims (2, 3, 4)
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5. A variable frequency oscillator device comprising:
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a first inverter stage designed to invert an input signal to generate a sawtooth signal by charging and discharging a capacitor using current sources that each provide a respective amount of current that is responsive to a control signal and to a dampening signal; a second inverter stage designed to generate a first inverted signal from the sawtooth signal of the first inverter stage; and a third inverter stage designed to; generate a second inverted signal from the first inverted signal, and dampen a signal transition rate for the first inverted signal based upon the control signal. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method comprising:
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generating, using a first inverter stage, a sawtooth signal by; inverting an input signal, and charging and discharging, responsive to a control signal, an oscillator capacitance predominantly derived from a parasitic capacitance of at least one capacitor; capacitively coupling, using the at least one capacitor, the sawtooth signal to an output node; generating, using a second inverter stage, a first inverted signal from the output node; generating, using a third inverter stage, a second inverted signal from the first inverted signal; providing the second inverted signal as the input signal; and dampening, in response to the control signal, a signal transition rate for the third inverter stage. - View Dependent Claims (12)
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Specification