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US 11,108,358 B2Granted
Oscillator circuit arrangement
AssigneeAms AG
InventorsElisa Girani, Kurt Fritzenwallner, Bernd Janger
Life of this patent
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Abstract
An oscillator circuit arrangement comprises a gain stage and a feedback loop that includes a crystal device. A clock signal monitor circuit is connected to an output of the gain stage and detects a frequency shift in the clock signal or a loss of oscillation. The current through the gain stage is controlled in response to a control signal generated by the clock signal monitor circuit.
Claims18
An oscillator circuit arrangement, comprising:
- a gain stage;
- a feedback loop including a crystal device connected to the gain stage;
- a clock signal monitor circuit detecting at least one of a frequency shift and a loss of oscillation, the clock signal monitor circuit coupled to an output terminal of the gain stage and configured to generate a control signal, the control signal controlling a current through the gain stage;
- a current mirror circuit including an input path including a diode connected MOS transistor and an output path, the output path connected to the gain stage to supply the current to the gain stage;
- and
- a controllable current source connected in parallel to the diode connected MOS transistor, wherein the controllable current source is switched into one of a conductive state and a non-conductive state in response to the control signal.
3 more elements
An electronic label device comprising:
- a display device;
- and
- an oscillator circuit arrangement, the oscillator circuit arrangement comprising:
- a gain stage;
- a feedback loop including a crystal device connected to the gain stage;
- a clock signal monitor circuit detecting at least one of a frequency shift and a loss of oscillation, the clock signal monitor circuit coupled to an output terminal of the gain stage and configured to generate a control signal, the control signal controlling a current through the gain stage, wherein the oscillator circuit arrangement provides a clock signal to control display of information on the display device;
- a current mirror circuit including an input path including a diode connected MOS transistor and an output path, the output path connected to the gain stage to supply the current to the gain stage;
- and
- a controllable current source connected in parallel to the diode connected MOS transistor, wherein the controllable current source is switched into one of a conductive state and a non-conductive state in response to the control signal.
6 more elements
An oscillator circuit arrangement, comprising:
- a gain stage;
- a feedback loop including a crystal device connected to the gain stage;
- a clock signal monitor circuit detecting at least one of a frequency shift and a loss of oscillation, the clock signal monitor circuit coupled to an output terminal of the gain stage and configured to generate a control signal, the control signal controlling a current through the gain stage;
- a current mirror circuit including an input path including a diode connected MOS transistor and an output path, the output path connected to the gain stage to supply the current to the gain stage;
- and
- a controllable current source connected in series with the diode connected MOS transistor, wherein the controllable current source is switched into one of a conductive state and a non-conductive state in response to the control signal,
- wherein the controllable current source is connected between the drain terminal of the diode connected MOS transistor of the current mirror circuit and the terminal for ground potential, and wherein the diode connected MOS transistor of the current mirror circuit is connected to a terminal for ground potential through a constant current source.
4 more elements
Dependencies are inferred from the claim text.