Wireless transceiver with modulation path delay calibration

Abstract

Various embodiments are disclosed relating to wireless systems, and relating to wireless transceivers. In an example embodiment, the wireless transceiver may include a voltage controlled oscillator (VCO) that may be controlled by a phase-locked loop (PLL). A fractional-N divider may be coupled to a feedback loop of the PLL and a delta-sigma modulator may control the fractional-N divider to vary the divider number of the fractional-N divider to cause the VCO to output a modulated frequency spectrum. In another embodiment, modulation path calibration may be performed by inputting an amplitude and phase modulated transmit spectrum to the transceiver's receiver to be demodulated. The demodulated transmit spectrum may then be analyzed to determine if the transmit spectrum meets one or more signal requirements, such as falling within a required spectral mask. The AM path delay and/or the PM path delay of the transmitter may be adjusted to decrease a mismatch in timing or delay between the AM and PM paths.

Dependencies are inferred from the claim text.