Antenna adjustment circuit, antenna adjustment method, and communication unit
First Claim
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1. An antenna adjustment circuit, comprising:
- a drive section inputting an alternating drive signal to a variable capacitance connected to an antenna; and
a control section setting a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance, wherein;
the antenna includes two terminals,the variable capacitance includes two terminals,a first terminal of the two terminals of the antenna is connected to a first terminal of the two terminals of the variable capacitance via a first capacitive device, anda second terminal of the two terminals of the antenna is connected to a second terminal of the two terminals of the variable capacitance via a second capacitive device.
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Abstract
An antenna adjustment circuit includes: a drive section that inputs an alternating drive signal to a variable capacitance connected to an antenna; and a control section that sets a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance.
9 Citations
19 Claims
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1. An antenna adjustment circuit, comprising:
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a drive section inputting an alternating drive signal to a variable capacitance connected to an antenna; and a control section setting a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance, wherein; the antenna includes two terminals, the variable capacitance includes two terminals, a first terminal of the two terminals of the antenna is connected to a first terminal of the two terminals of the variable capacitance via a first capacitive device, and a second terminal of the two terminals of the antenna is connected to a second terminal of the two terminals of the variable capacitance via a second capacitive device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An antenna adjustment circuit comprising:
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a drive section inputting an alternating drive signal to a variable capacitance connected to an antenna; and a control section setting a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance, wherein; the drive section generates the alternating drive signal based on a clock signal, and the control section sets the capacitance value of the variable capacitance, based on a phase difference between the clock signal and the output signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An antenna adjustment method, comprising:
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generating an alternating drive signal based on a clock signal; inputting the alternating drive signal to a variable capacitance connected to an antenna; deriving an output signal from the variable capacitance; and setting a capacitance value of the variable capacitance, wherein the capacitance value is set based on a phase difference between the clock signal and the output signal.
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18. A communication unit with an antenna, a communication section performing communication using the antenna, and an antenna adjustment circuit, the antenna adjustment circuit comprising:
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a drive section inputting an alternating drive signal to a variable capacitance connected to the antenna; and a control section setting a capacitance value of the variable capacitance, based on a phase of an output signal derived from the variable capacitance, wherein; the antenna includes two terminals, the variable capacitance includes two terminals, a first terminal of the two terminals of the antenna is connected to a first terminal of the two terminals of the variable capacitance via a first capacitive device, and a second terminal of the two terminals of the antenna is connected to a second terminal of the two terminals of the variable capacitance via a second capacitive device. - View Dependent Claims (19)
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Specification