Resistor compensation apparatus
AssigneeBroadcom Corporation
InventorsDavid Kyong-Sik Chung, Afshin Momtaz, Mario Caresosa
Life of this patent
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Abstract
A compensation apparatus maintains an effective resistance of one or more resistors in a circuit by associating an adjustable resistor circuit to each resistor. The compensation apparatus compares the resistance of a resistor in the circuit with the resistance of a reference resistor. When the resistance of the resistor in the circuit falls outside of a desired range, the compensation apparatus adjusts the resistance of the adjustable resistor to adjust the effective resistance of the resistor and adjustable resistor combination.
Claims26
A resistor compensation circuit comprising:
- at least one reference resistor;
- at least one circuit resistor;
- a plurality of comparators for comparing resistances of the at least one reference resistor and the at least one circuit resistor to generate at least one control signal;
- a fixed load resistor;
- and
- at least one digital to analog converter, connected in parallel with the fixed load resistor, that provides a selectable resistance in accordance with the at least one control signal.
A method of compensating resistance comprising:
- providing at least one programmable resistor having a controllable resistance;
- detecting variation in a resistance due to process or temperature variation;
- generating at least one control signal in accordance with the detected variation in the resistance;
- and
- controlling the resistance of the at least one programmable resistor in accordance with the at least one control signal;
- wherein the at least one programmable resistor comprises a fixed load resistor connected in parallel with at least one digital to analog converter.
A method of compensating resistance comprising:
- providing at least one programmable resistor having a controllable resistance;
- detecting variation in a resistance due to process or temperature variation;
- generating at least one control signal in accordande with the detected variation in the resistance;
- controlling the resistance of the at least one programmable resistor in accordance with the at least one control signal;
- and
- comparing a plurality of reference signals with at least one signal associated with an external to internal resistor ratio.
A method of compensating resistance comprising:
- providing at least one programmable resistor having a controllable resistance;
- detecting variation in a resistance due to process or temperature variation;
- generating at least one control signal in accordance with the detected variation in the resistance;
- controlling the resistance of the at least one programmable resistor in accordance with the at least one control signal;
- and
- generating reference signals and selecting at least a portion of the reference signals for comparison with at least one signal associated with an external to internal resistor ratio.
A method of compensating resistance comprising:
- providing at least one programmable resistor having a controllable resistance;
- detecting variation in a resistance due to process or temperature variation;
- generating at least one control signal in accordance with the detected variation in the resistance;
- controlling the resistance of the at least one programmable resistor in accordance with the at least one control signal;
- and
- sampling the at least one control signal for at least one period of time to determine at least one signal level associated with the at least one control signal.
A method of compensating resistance comprising:
- providing at least one programmable resistor having a controllable resistance;
- detecting variation in a resistance due to process or temperature variation;
- generating at least one control signal in accordance with the detected variation in the resistance;
- and
- controlling the resistance of the at least one programmable resistor in accordance with the at least one control signal;
- wherein detecting variation in a resistance comprises applying hysteresis to a reference signal.
Dependencies are inferred from the claim text.