Power and impedance measurement circuits for a wireless communication device
First Claim
1. An apparatus comprising:
- a sensor coupled to each of first and second ends of a circuit coupled to a load and configured to measure a voltage drop across the circuit to obtain a first sensed signal, to sense a second voltage signal at the second end of the circuit to obtain a second sensed signal, and to provide a sensor output generated based at least in part on multiplying the first and second sensed signals; and
a computation unit coupled to the sensor and to compute power observed at the load based on the sensor output.
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Accused Products
Abstract
Exemplary embodiments disclosed are directed to power and impedance measurement circuits that may be used to measure power and/or impedance are described. A measurement circuit may include a sensor and a computation unit. The sensor may sense (i) a first voltage signal across a series circuit coupled to a load to obtain a first sensed signal and (ii) a second voltage signal at a designated end of the series circuit to obtain a second sensed signal. The sensor may mix (i) a first version of the first sensed signal with a first version of the second sensed signal to obtain a first sensor output and (ii) a second version of the first sensed signal with a second version of the second sensed signal to obtain a second sensor output. The computation unit may determine the impedance and/or delivered power at the designated end of the series circuit based on the sensor outputs.
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Citations
13 Claims
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1. An apparatus comprising:
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a sensor coupled to each of first and second ends of a circuit coupled to a load and configured to measure a voltage drop across the circuit to obtain a first sensed signal, to sense a second voltage signal at the second end of the circuit to obtain a second sensed signal, and to provide a sensor output generated based at least in part on multiplying the first and second sensed signals; and a computation unit coupled to the sensor and to compute power observed at the load based on the sensor output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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measuring a voltage drop across first and second ends of a circuit coupled to a load to obtain a first sensed signal; sensing a second voltage signal at the second end of the circuit to obtain a second sensed signal; generating a sensor output based at least in part on multiplying the first and second sensed signals; and computing power observed at the load based on the sensor output. - View Dependent Claims (11)
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12. An apparatus comprising:
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means for measuring a voltage drop across first and second ends of a circuit coupled to a load to obtain a first sensed signal; means for sensing a second voltage signal at the second end of the circuit to obtain a second sensed signal; means for generating a sensor output based at least in part on multiplying the first and second sensed signals; and means for computing power observed at the load based on the sensor output.
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13. A wireless device comprising:
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a first power amplifier to amplify a first input radio frequency (RF) signal and provide a first amplified RF signal; a first tunable matching circuit coupled to the first power amplifier and to provide output impedance matching for the first power amplifier, to receive the first amplified RF signal, and to provide a first output RF signal; and a computation circuit coupled in parallel to the first tunable matching circuit and to compute first impedance or observed power at output of the first tunable matching circuit, the first tunable matching circuit being adjusted based on the measured first impedance or observed power.
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Specification