Biasing RMR with constant power
AssigneeMarvell International Ltd.
InventorKan Li
Life of this patent
Estimating the term…
Abstract
An RMR is biased with constant power. Voltages are applied across at least two variable resistors, which are coupled on opposing ends of the RMR, to establish a current to the RMR, wherein the current is based on the voltages and on resistance values of the at least two variable resistors. A voltage corresponding to the established current of the RMR is amplified. The amplified voltage is compared to a reference voltage, wherein the reference voltage is based on a target power for the RMR. The resistance values of the at least two variable resistors are modified so that the amplified voltage approaches the reference voltage. Modifying the resistance values of the at least two variable resistors in this manner is seen to bias the RMR with constant power, since the reference voltage is based on a target power for the RMR.
Claims44
A method for biasing an RMR with constant power, comprising:
- applying voltages across at least two variable resistors, which are coupled on opposing ends of the RMR, to establish a current to the RMR, wherein the current is based on the voltages and on resistance values of the at least two variable resistors;
- amplifying a voltage corresponding to the established current of the RMR;
- comparing the amplified voltage to a reference voltage, wherein the reference voltage is based on a target power for the RMR;
- and
- modifying the resistance values of the at least two variable resistors so that the amplified voltage approaches the reference voltage.
A circuit for biasing an RMR with constant power, comprising:
- at least two operational amplifiers;
- at least two variable resistors coupled on opposing ends of the RMR, wherein the at least two operational amplifiers respectively apply voltages to the at least two variable resistors to establish a current to the RMR, and wherein the current is based on the voltages and on resistance values of the at least two variable resistors;
- a variable gain amplifier for amplifying a voltage corresponding to the established current of the RMR;
- a comparator for comparing the amplified voltage to a reference voltage, wherein the reference voltage is based on a target power for the RMR;
- and
- a control logic unit for modifying the resistance values of the at least two variable resistors so that the amplified voltage approaches the reference voltage.
An apparatus for biasing an RMR with constant power, comprising:
- means for applying voltages across at least two variable resistors, which are coupled on opposing ends of the RMR, to establish a current to the RMR, wherein the current is based on the voltages and on resistance values of the at least two variable resistors;
- means for amplifying a voltage corresponding to the established current of the RMR;
- means for comparing the amplified voltage to a reference voltage, wherein the reference voltage is based on a target power for the RMR;
- and
- means for modifying the resistance values of the at least two variable resistors so that the amplified voltage approaches the reference voltage.
A method for biasing an RMR with constant power, comprising:
- generating a current to the RMR;
- amplifying a voltage corresponding to the generated current of the RMR;
- comparing the amplified voltage to a reference voltage, wherein the reference voltage is based on a target power for the RMR;
- and
- adjusting the amplified voltage to approach the reference voltage;
- wherein the generating step applies voltages across at least two variable resistors, which are coupled on opposing ends of the RMR, to generate the current to the RMR, and wherein the current is based on the voltages and on resistance values of the at least two variable resistors.
An apparatus for biasing an RMR with constant power, comprising:
- a generator for generating a current to the RMR;
- an amplifier for amplifying a voltage corresponding to the generated current of the RMR;
- a comparator for comparing the amplified voltage to a reference voltage, wherein the reference voltage is based on a target power for the RMR;
- and
- an adjuster for adjusting the amplified voltage to approach the reference voltage;
- wherein the generator applies voltages across at least two variable resistors, which are coupled on opposing ends of the RMR, to generate the current to the RMR, and wherein the current is based on the voltages and on resistance values of the at least two variable resistors.
An apparatus for biasing an RMR with constant power, comprising:
- means for generating a current to the RMR;
- means for amplifying a voltage corresponding to the generated current of the RMR;
- means for comparing the amplified voltage to a reference voltage, wherein the reference voltage is based on a target power for the RMR;
- and
- means for adjusting the amplified voltage to approach the reference voltage;
- wherein the means for generating applies voltages across at least two variable resistors, which are coupled on opposing ends of the RMR, to generate the current to the RMR, and wherein the current is based on the voltages and on resistance values of the at least two variable resistors.
Dependencies are inferred from the claim text.