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AssigneeGM Global Technology Operations LLC
InventorsTimothy J. Talty, Cynthia D. Baringer, Mohiuddin Ahmed, James Chingwei Li, Yen-Cheng Kuan, Hsuanyu Pan, Emilio A. Sovero
Estimating the term…
A cellular radio architecture that includes a receiver module having a delta-sigma modulator that includes a plurality of gm cells configured in stages, where each stage includes at least two gm cells and an LC filter circuit. The gm cells in each stage can be controlled to be active or inactive to convert, for example, the modulator from a fourth order modulator to a second order modulator to reduce power dissipation. Further, the gm cells can be controlled to optimize a dynamic range of the modulator and to redirect current from inactive cells to active cells in order to optimize power consumption.
A transceiver front-end circuit for a cellular radio, said transceiver circuit comprising:
A receiver module for a front-end circuit of a radio, said receiver module comprising a delta-sigma modulator including an array of gm cells operating as transconductance amplifiers, said delta-sigma modulator including a plurality of resonator stages where each stage includes at least two gm cells, a summation junction responsive to output signals from the at least two gm cells and an inductance-capacitance (LC) filter circuit, said delta-sigma modulator further including a coefficient controller operable to activate or deactivate selective ones of the gm cells by adding or removing transconductance for the gm cells to control a dynamic range of the delta-sigma modulator and/or decrease or increase the order of the modulator.
A receiver module for a front-end circuit of a radio, said receiver module comprising a fourth order delta-sigma modulator including an array of gm cells operating as transconductance amplifiers, said delta-sigma modulator including a plurality of resonator stages where each stage includes at least two gm cells, a summation junction responsive to output signals from the at least two gm cells and an inductance-capacitance (LC) filter circuit, said delta-sigma modulator further including a coefficient controller operable to activate or deactivate selective ones of the gm cells by adding or removing transconductance for the gm cells to control a dynamic range of the delta-sigma modulator and/or decrease or increase the order of the delta-sigma modulator, wherein the coefficient controller deactivates the gm cells in at least one of the resonator stages so as to convert the fourth order modulator to a second order modulator, said delta-sigma modulator further including a current source routing network and a plurality of current sources, said current source routing network selectively providing current to the gm cells from the current sources, wherein the current source routing network selectively removes current from certain ones of the gm cells and directs current to other gm cells having a high transconductance.
Dependencies are inferred from the claim text.