Apparatus and methods for transceiver calibration
First Claim
1. A method of transceiver calibration comprising:
- generating a transmit local oscillator signal of a first frequency using a transmit local oscillator;
mixing a transmit signal and the transmit local oscillator signal using a transmit mixer of a transmit channel;
generating an observation local oscillator signal of a second frequency different from the first frequency using an observation local oscillator;
generating an observation signal from the transmit channel;
mixing the observation signal and the observation local oscillator signal using an observation mixer of an observation channel; and
detecting impairments of the transmit channel based on an output signal of the observation channel using a transmit error correction circuit.
1 Assignment
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Accused Products
Abstract
Apparatus and methods for transceiver calibration are provided. In certain configurations, a transceiver includes a transmit channel and an observation channel. The transmit channel includes a transmit mixer that up-converts a transmit signal by a first or transmit local oscillator frequency. The observation channel includes an observation mixer that down-converts an observed signal from the transmit channel by a second or observation local oscillator frequency that is offset from the first local oscillator frequency. By observing the transmit channel using a local oscillator frequency that is offset relative to the transmit channel'"'"'s local oscillator frequency, the observation channel can observe transmit channel impairments substantially independently from observation channel impairments.
75 Citations
21 Claims
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1. A method of transceiver calibration comprising:
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generating a transmit local oscillator signal of a first frequency using a transmit local oscillator; mixing a transmit signal and the transmit local oscillator signal using a transmit mixer of a transmit channel; generating an observation local oscillator signal of a second frequency different from the first frequency using an observation local oscillator; generating an observation signal from the transmit channel; mixing the observation signal and the observation local oscillator signal using an observation mixer of an observation channel; and detecting impairments of the transmit channel based on an output signal of the observation channel using a transmit error correction circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A transceiver comprising:
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a transmit channel comprising; a transmit local oscillator configured to generate a transmit local oscillator signal of a first frequency; and a transmit mixer configured to mix a transmit signal and the transmit local oscillator signal; an observation channel comprising; an observation local oscillator configured to generate an observation local oscillator signal of a second frequency different from the first frequency; and an observation mixer configured to mix an observation signal generated from the transmit channel and the observation local oscillator signal; and a transmit error correction circuit configured to detect impairments of the transmit channel based on an output signal of the observation channel. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification