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US 6,147,543 AGranted
Method and apparatus for selecting from multiple mixers
AssigneeMotorola, Inc.
InventorsPaul H. Gailus, Kevin J. McCallum
Life of this patent
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Abstract
An apparatus includes a current generator (101) having an output. A plurality of mixers (103, 105, and 107) is switchably coupled to the current generator output, such that a first average power output level is provided when a first mixer (103) of the plurality of mixers is engaged and a second average power output level is provided when a second mixer (105) of the plurality of mixers is engaged. The first average power output level and the second average power output level are different.
Claims30
A transmitter comprising:
- a current generator having an output;
- a plurality of mixers switchably coupled to the current generator output, such that a first average power output level of the transmitter is provided when a first mixer of the plurality of mixers is activated and a second average power output level of the transmitter is provided when a second mixer of the plurality of mixers is activated, wherein the first average power output level and the second average power output level are different.
An apparatus comprising:
- a current generator having an output;
- a current mirror coupled to the current generator output;
- a plurality of selectabe mixers operably coupled to the current mirror, such that a first average power output level of the transmitter is provided when a first of the plurality of mixers is engaged and a second average power output level of the transmitter is provided when a second of the plurality of mixers is engaged, wherein the first average power output level and the second average power output level are different.
A method comprising the steps of:
- generating a current proportional to an input signal;
- establishing an average power output level of a transmitter;
- selecting a first mixer of a plurality of mixers, wherein each of the plurality of mixers has a different average power output level, and wherein the first mixer has a power output level at the established average power output level of the transmitter, and a second mixer of the plurality of mixers is not activated when the first mixer of the plurality of mixers is activated;
- and
- applying the proportional current to the first mixer.
2 more elements
Dependencies are inferred from the claim text.