Power dissipation reduction in wireless transceivers
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0 Petitions
Accused Products
Abstract
Methods and circuits for reducing power dissipation in wireless transceivers and other electronic circuits and systems. Embodiments of the present invention use bias current reduction, impedance scaling, and gain changes either separately or in combination to reduce power dissipation. For example, bias currents are reduced in response to a need for reduced signal handling capability, impedances are scaled thus reducing required drive and other bias currents in response to a strong received signal, or gain is increased and impedances are scaled in response to a low received signal in the presence of no or weak interfering signals.
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Citations
80 Claims
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1-30. -30. (canceled)
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31. A method of power dissipation control when receiving a signal, the method comprising:
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determining a first signal strength at a first node in a receive signal path; and
,causing a change in power dissipation of the receiver by dynamically changing an impedance of a component in the receive signal path based on the first signal strength;
the receive signal path including a low-noise amplifier configured to receive the signal, a mixer having an input coupled to an output of the low-noise amplifier, and a filter having an input coupled to an output of the mixer. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method of power dissipation control when receiving a signal comprising a preamble portion and a data portion, the method comprising:
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determining a first signal strength at a first node in a signal path of a receiver; and
,while receiving the preamble portion of the signal, dynamically changing a bias current in the signal path based on the first signal strength, and while receiving the data portion of the signal, maintaining the bias current in the signal path;
the receive signal path including a low-noise amplifier configured to receive the signal, a mixer having an input coupled to an output of the low-noise amplifier, and a filter having an input coupled to an output of the mixer. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A method of power dissipation control when receiving a signal comprising:
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determining a first signal strength at a first node in a receive signal path, wherein the first node is before a first circuit in the receive signal path, the receive signal path including the first circuit and a second circuit having an input coupled to an output of the first circuit;
dynamically changing a gain of the first circuit based on the first signal strength; and
,dynamically changing an impedance of a component in the second circuit based on the first signal strength. - View Dependent Claims (55, 56, 57, 58, 59, 60, 61, 62)
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63. A method of power dissipation control when receiving a signal, the method comprising:
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determining the strength of a desired signal and the strength of an interferer signal at a first node in a receive signal path; and
,causing a change in power dissipation of the receive signal path by dynamically changing an impedance of a component in the receive signal path based on the strengths of said desired signal and said interferer signal;
the receive signal path including a low-noise amplifier configured to receive the signal, a mixer having an input coupled to an output of the low-noise amplifier, and a filter having an input coupled to an output of the mixer. - View Dependent Claims (64, 65, 66, 67, 68)
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69. A method for power dissipation control when receiving a signal, the method comprising:
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varying an impedance in a receive signal path responsive of at least a first signal strength, the varying of the impedance resulting in the controlling a noise level in the receive signal path;
the increasing of the impedance causing a saving of power dissipation in at least the receive signal path. - View Dependent Claims (70, 71, 72, 73, 74, 75, 76)
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77. A method of power dissipation control when receiving a signal, the method comprising:
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varying a gain in the receive signal path responsive to at least a first signal strength, the varying of the gain resulting in the controlling of a noise level in the receive signal path;
the increasing of the gain causing a reduction of power dissipation of at least the receiving signal path. - View Dependent Claims (78, 79, 80)
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Specification