Electronic Device With Impedance Measurement Circuitry
First Claim
1. An electronic device, comprising:
- wireless circuitry that includes an antenna and a radio-frequency transceiver that transmits signals to the antenna, wherein some of the transmitted signals reflect from the antenna as reflected signals; and
an impedance measurement circuit having;
a forward coupler that taps the transmitted signals;
a first reverse coupler that taps the reflected signals; and
a second reverse coupler that taps the reflected signals after the reflected signals have passed through the first reverse coupler.
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Accused Products
Abstract
An electronic device may be provided with wireless circuitry. The wireless circuitry may include wireless transceiver circuitry that transmits signals towards an antenna. A signal path may carry the transmitted signals to the antenna. Reflected signals from the antenna may be carried along the signal path towards the transceiver circuitry. Coupler circuitry may include a forward coupler that taps the transmitted signals, a first reverse coupler that taps the reflected signals from the antenna, and a second reverse coupler that taps the reflected signals that have passed through the first reverse coupler. Analog processing circuitry and digital processing circuitry may be used to produce an impedance measurement from the tapped signals from the coupler circuitry. The analog processing circuitry may include analog signal mixers, low pass filters, and analog-to-digital converter circuitry.
14 Citations
22 Claims
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1. An electronic device, comprising:
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wireless circuitry that includes an antenna and a radio-frequency transceiver that transmits signals to the antenna, wherein some of the transmitted signals reflect from the antenna as reflected signals; and an impedance measurement circuit having; a forward coupler that taps the transmitted signals; a first reverse coupler that taps the reflected signals; and a second reverse coupler that taps the reflected signals after the reflected signals have passed through the first reverse coupler. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Wireless circuitry, comprising:
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an antenna; a radio-frequency transceiver coupled to the antenna; a path that carries radio-frequency signals as the radio-frequency transceiver transmits signals with the antenna; and an impedance measurement circuit having first, second, and third couplers that tap signals flowing on the path. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An impedance measurement circuit coupled in a signal path that carries radio-frequency signals within wireless circuitry in an electronic device, comprising:
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a forward coupler that taps into transmitted signals flowing on the signal path, wherein the transmitted signals are reflected to form reflected signals; a first reverse coupler that taps into the reflected signals; a second reverse coupler that taps into the reflected signals after the reflected signals have passed through the first reverse coupler; and analog signal processing circuitry including mixer circuitry that receives the tapped transmitted signals, the tapped reflected signals from the first reverse coupler, and the tapped reflected signals from the second reverse coupler. - View Dependent Claims (22)
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Specification