Oscillator bias stabilization circuit for single-pin crystal oscillators
AssigneeArm Limited
InventorAlexandru Aurelian Ciubotaru
Life of this patent
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Abstract
An oscillator bias stabilization circuit and method for biasing the circuit is disclosed. The bias stabilization circuit includes a plurality of resistive dividers responsive to a control signal in the circuit. The plurality of resistive dividers are selectably connectable in the circuit to provide an adaptable equivalent resistance in response to a control signal while keeping a bias voltage produced by the circuit substantially constant as the loop gain of an oscillator is varied. The plurality of resistive dividers are coupled to a node in the oscillator that establishes the bias voltage.
Claims18
An oscillator bias stabilization circuit, comprising:
- a plurality of resistive dividers responsive to a control signal in the circuit;
- the plurality of resistive dividers selectably connectable in the circuit to provide an adaptable equivalent resistance in response to a control signal while keeping a bias voltage produced by the circuit substantially constant as the loop gain of an oscillator is varied, the plurality of resistive dividers coupled to a node in the oscillator that establishes the bias voltage,
- the plurality of resistive dividers connected in parallel with a fixed resistive divider of the circuit.
A method of stabilizing a bias voltage in an oscillator circuit, the method comprising:
- varying the loop gain of an oscillator;
- and
- in response to a control signal, selectably connecting a plurality of resistive dividers in the circuit to provide an adaptable equivalent resistance while keeping the bias voltage substantially constant as the loop gain is varied, the plurality of resistive dividers coupled to a node in the oscillator that establishes the bias voltage,
- the plurality of resistive dividers are connected in parallel with a fixed resistive divider.
An oscillator bias stabilization circuit, comprising:
- a plurality of resistive dividers responsive to a control signal in the circuit;
- the plurality of resistive dividers selectably connectable in the circuit to provide an adaptable equivalent resistance in response to a control signal while keeping a bias voltage produced by the circuit substantially constant as the loop gain of an oscillator is varied, the plurality of resistive dividers coupled to a node in the oscillator that establishes the bias voltage,
- the bias voltage is the common-mode voltage of a plurality of active transconductor cells of a transconductor of the circuit.
Dependencies are inferred from the claim text.