Oscillator circuit
First Claim
1. An oscillator circuit comprising:
- an input and an output arranged for connection of a resonator therebetween;
inverter means having a first driver transistor and a second driver transistor coupled in series via said output;
biasing means having a first biasing element coupled between said output and a control electrode of the first driver transistor for biasing the first driver transistor, and a second biasing element coupled between said output and the control electrode of the second driver transistor for biasing the second driver transistor;
first limiting means coupled between the control electrode of said first driver transistor and a first node for receiving a signal representative of the signal at the output, and second limiting means coupled between the control electrode of said second driver transistor and a second node for receiving a signal representative of the signal at the output, the control inputs of the first and second driver transistors being capacitively coupled to the input.
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Accused Products
Abstract
An oscillator circuit (300) comprising: a resonator (Q) connected between an input (IN)and an output (OUT); an inverter having first and second driver transistors (MP, MN) connected in series via an output-coupled node; first and second biasing transistors (MPD, MND) for biasing the driver transistors; and first and second limiting means between the gate electrodes of the driver transistors respectively and the output. The CMOS circuit allows regulation of the oscillation amplitude without need for well-controlled DC current sources to polarize correctly the driver transistors, and without need for a start-up circuit to ensure that both driver transistors remain in saturation when the circuit is powered on. A simple oscillator circuit (600) has an inverter whose input is capacitively coupled to the input (IN), first limiting means coupled between the inverter input and the output (OUT), and second limiting means coupled between the input (IN) and the output (OUT).
5 Citations
13 Claims
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1. An oscillator circuit comprising:
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an input and an output arranged for connection of a resonator therebetween;
inverter means having a first driver transistor and a second driver transistor coupled in series via said output;
biasing means having a first biasing element coupled between said output and a control electrode of the first driver transistor for biasing the first driver transistor, and a second biasing element coupled between said output and the control electrode of the second driver transistor for biasing the second driver transistor;
first limiting means coupled between the control electrode of said first driver transistor and a first node for receiving a signal representative of the signal at the output, and second limiting means coupled between the control electrode of said second driver transistor and a second node for receiving a signal representative of the signal at the output, the control inputs of the first and second driver transistors being capacitively coupled to the input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13)
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11. An oscillator circuit comprising:
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an input and an output arranged for connection of a resonator therebetween;
inverter means having an input and having an output coupled to the output of the circuit;
capacitance means coupled between the input of the circuit and the input of the inverter;
first limiting means coupled between the input of the inverter and the output of the circuit;
and second limiting means coupled between the input of the circuit and the output of the circuit. - View Dependent Claims (12)
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Specification