Cross-core calibration in a multi-radio system
First Claim
1. An apparatus comprising:
- a first radio frequency (RF) transmitter;
a first RF receiver that operates with the first RF transmitter;
a second RF transmitter;
a second RF receiver that operates with the second RF transmitter; and
a calibration control circuitry coupled to perform calibration operations on the first and second RF transmitters and the first and second RF receivers by first performing self calibration on the first and second RF transmitters and subsequently using the first and second RF transmitters that have been calibrated to perform cross-core calibration on the first and second RF receivers, the calibration control circuitry to perform transmitter self calibration by utilizing an internal feedback path that is separate from the RF receivers to calibrate the RF transmitters to obtain transmitter calibration settings for the first and second RF transmitters, the calibration control circuitry to perform calibration operations on the first and second RF receivers by performing a first loopback calibration operation during which time the second RF transmitter and the first RF receiver are active to determine first receiver calibration settings for the first RF receiver based on transmissions from the second RF transmitter and by performing a second loopback calibration operation during which time the first RF transmitter and the second RF receiver are active to determine second receiver calibration settings for the second RF receiver based on transmissions from the first RF transmitter.
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Accused Products
Abstract
A Radio Frequency (RF) transceiver includes a first RF transceiver group, a second RF transceiver group, local oscillation circuitry, and calibration control circuitry. Each of the RF transceiver group has an RF transmitter and an RF receiver. The local oscillation circuitry selectively produces a local oscillation to the first RF transceiver group and to the second RF transceiver group. The calibration control circuitry is operable to initiate calibration operations including transmitter self calibration operations, first loopback calibration operations, and second loopback calibration operations. During loopback calibration operations, test signals produced by an RF transceiver group are looped back to an RF receiver of another RF transceiver group.
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Citations
16 Claims
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1. An apparatus comprising:
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a first radio frequency (RF) transmitter; a first RF receiver that operates with the first RF transmitter; a second RF transmitter; a second RF receiver that operates with the second RF transmitter; and a calibration control circuitry coupled to perform calibration operations on the first and second RF transmitters and the first and second RF receivers by first performing self calibration on the first and second RF transmitters and subsequently using the first and second RF transmitters that have been calibrated to perform cross-core calibration on the first and second RF receivers, the calibration control circuitry to perform transmitter self calibration by utilizing an internal feedback path that is separate from the RF receivers to calibrate the RF transmitters to obtain transmitter calibration settings for the first and second RF transmitters, the calibration control circuitry to perform calibration operations on the first and second RF receivers by performing a first loopback calibration operation during which time the second RF transmitter and the first RF receiver are active to determine first receiver calibration settings for the first RF receiver based on transmissions from the second RF transmitter and by performing a second loopback calibration operation during which time the first RF transmitter and the second RF receiver are active to determine second receiver calibration settings for the second RF receiver based on transmissions from the first RF transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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performing a self calibration on a first and second radio frequency (RF) transmitters by utilizing an internal feedback path that is separate from a first RF receiver and a second RF receiver, in which the first RF receiver operates with the first RF transmitter and the second RF receiver operates with the second RF transmitter during a normal mode of operation; performing, subsequently to the self calibration of the first and second RF transmitters, a first loopback calibration operation during which time the second RF transmitter and the first RF receiver are active to determine first receiver calibration settings for the first RF receiver based on transmissions from the second RF transmitter; and performing, subsequently to the self calibration of the first and second RF transmitters, a second loopback calibration operation during which time the first RF transmitter and the second RF receiver are active to determine second receiver calibration settings for the second RF receiver based on transmissions from the first RF transmitter. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification