High quality parallel resonance oscillator
AssigneeDialog Semiconductor GmbH
InventorsAndreas Sibrai, Kurt Fritzwenwallner
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Abstract
A highly stable single chip resonator controlled oscillator with automatic amplitude control and biasing is designed for manufacture with monolithic integrated circuit technologies. Analog and digital output buffers with elaborate control for power saving purposes and sophisticated start-up and power-up circuits ensure, that a crystal controlled oscillation is safely induced at start-up and that the amplitude of oscillation is continuously controlled during operation to reach low phase noise and reduce power consumption of the circuit.
Claims42
A circuit, capable of generating a resonator controlled oscillator output signal, comprising:
- means for generating an oscillating signal having a stable and predetermined oscillation frequency;
- means for driving said oscillation generating means and for matching the impedance levels between said oscillation generating means and the oscillator driving means;
- means for automatic amplitude controlling and biasing the generated oscillation signal of said oscillation generating means and said oscillator driving means, controlling the amplification factor (gain) of said oscillator driving means in such a way, that a steady oscillation signal is maintained, biasing the circuits of said oscillation generating means and said oscillator driving means in such a way, that an optimized operating mode is obtained;
- means for a first buffering of said generated oscillation signal of said oscillation generating means and said oscillator driving means as a sinewave signal, named also as analog signal;
- means for a second buffering of said generated oscillation signal of said oscillation generating means and said oscillator driving means as a digitally transformed, rectangular square wave signal;
- means for generating the start-up control signals for said oscillation generating means and said oscillator driving means to ensure a safe start-up procedure;
- and
- means for generating the power-up and shut-down control signals for said oscillator driving means, for said automatic amplitude controlling and biasing means, for said first buffering means and said second buffering means, and for said start-up means.
A method for generating a stable, amplitude controlled oscillation signal within an electronic device or technology, comprising:
- providing a crystal resonator element for determination of the oscillator frequency;
- providing a Pierce oscillator circuit for driving the resonator element;
- providing an automatic amplitude control circuit for stabilizing the oscillation signal;
- providing a biasing circuit for the amplification of the oscillation signal;
- providing an analog output buffer circuit for isolating the oscillator circuit from load influences;
- providing a digital output buffer circuit for transforming the sinewave oscillator circuit into a square wave signal;
- providing a start-up circuit for establishing secure start-up conditions for the Pierce oscillator and the automatic amplitude controller and biasing circuit;
- providing a power-up circuit for fast power-up action and for enabling an operation in power saving mode.
Dependencies are inferred from the claim text.