Devices and methods related to compensated power detector
AssigneeSkyworks Solutions, Inc.
InventorAdrian John Bergsma
Life of this patent
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Abstract
In some embodiments, a compensated power detector can include a power detector that includes a first detection cell having a bias input and an output, and a second detection cell having a signal input, a bias input and an output. The power detector can further include an error amplifier having a first input coupled to the output of the first detection cell, and a second input for receiving a reference voltage. The error amplifier can be configured to provide an output voltage to each of the bias inputs of the first and second detection cells, such that an output of the second detection cell is representative of power of a radio-frequency signal received at the signal input with an adjustment for one or more non-signal effects as measured by the first detection cell and the error amplifier.
Claims20
A wireless device comprising:
- a radio circuit;
- an antenna;
- and
- a power detector including a first detection cell including a first emitter follower detector having a base, a collector and an emitter, the first detection cell configured such that the base only receives a bias voltage, the collector is only coupled to a supply node, and the emitter provides an output, the power detector further including a second detection cell including a second emitter follower detector having a base, a collector and an emitter, the second detection cell configured such that the base receives a bias voltage and a radio-frequency signal, the collector is coupled to a supply node and a filter capacitance, and the emitter provides an output, the power detector further including an error amplifier having a first input coupled to the output of the first emitter follower detector, a second input for receiving a reference voltage, and an output coupled to the base of each of the first and second emitter follower detectors, such that the bias voltage provided to the base of the first emitter follower detector is representative of an output voltage of the error amplifier and is the same as the bias voltage provided to the base of the second emitter follower detector.
A method of implementing a power detector, comprising:
- providing a first detection cell including a first emitter follower detector having a base, a collector and an emitter, the first detection cell configured such that the base only receives a bias voltage, the collector is only coupled to a supply node, and the emitter provides an output;
- providing a second detection cell including a second emitter follower detector having a base, a collector and an emitter, the second detection cell configured such that the base receives a bias voltage and a radio-frequency signal, the collector is coupled to a supply node and a filter capacitance, and the emitter provides an output;
- and
- providing an error amplifier having a first input coupled to the output of the first emitter follower detector, a second input for receiving a reference voltage, and an output coupled to the base of each of the first and second emitter follower detectors, such that the bias voltage provided to the base of the first emitter follower detector is representative of an output voltage of the error amplifier and is the same as the bias voltage provided to the base of the second emitter follower detector.
Dependencies are inferred from the claim text.