Power control feedback loop for adjusting a magnitude of an output signal
First Claim
1. A circuit for adjusting a magnitude of a transmit signal, comprising:
- a transmitter, providing a transmit signal;
an amplifier, receiving the transmit signal and a power control adjustment signal, and responsive thereto, providing an amplified transmit signal;
a detector, for detecting an amplitude of the amplified transmit signal;
an error component for determining the difference between the amplitude and a reference level; and
a digital signal generator, receiving the difference, and responsive thereto, generating a reference signal and the power control adjustment signal;
wherein the reference level is responsive to the reference signal, andwherein the digital signal generator comprisesan analog to digital circuit receiving the difference and generating a digital difference signal representative of the difference; and
a processor configured to facilitate receiving the digital difference signal, processing the difference, and adjusting the reference signal and the power control signal responsive to the difference.
20 Assignments
0 Petitions
Accused Products
Abstract
A circuit for adjusting a magnitude of a transmit signal includes a transmitter (105), providing a transmit signal (107). It also includes a transmitter amplifier (109), receiving the transmit signal (107) and a power control adjustment signal (121), and responsive thereto, providing an amplified transmit signal (111). The circuit also includes a detector (123), for detecting an amplitude of the amplified transmit signal (111). Also included is an error component (137) for determining the difference between the amplitude and a reference level (129). Further provided is a digital signal generator (155), receiving the difference (145), and responsive thereto, generating (157) a reference signal (125) and the power control adjustment signal (117, 121), where the reference level (129) is responsive to the reference signal (125).
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Citations
17 Claims
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1. A circuit for adjusting a magnitude of a transmit signal, comprising:
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a transmitter, providing a transmit signal; an amplifier, receiving the transmit signal and a power control adjustment signal, and responsive thereto, providing an amplified transmit signal; a detector, for detecting an amplitude of the amplified transmit signal; an error component for determining the difference between the amplitude and a reference level; and a digital signal generator, receiving the difference, and responsive thereto, generating a reference signal and the power control adjustment signal; wherein the reference level is responsive to the reference signal, and wherein the digital signal generator comprises an analog to digital circuit receiving the difference and generating a digital difference signal representative of the difference; and a processor configured to facilitate receiving the digital difference signal, processing the difference, and adjusting the reference signal and the power control signal responsive to the difference. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for determining transmit power in a signal, comprising:
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detecting peaks in a transmit signal by using a detector; detecting an error from at least one error source affecting the transmit signal, relative to a reference level; detecting a deviation in the error from an error level; and correcting a transmitted output level for the error, wherein the at least one error source is a resistor, and wherein a DAC current is proportional to the tolerance of the resistor. - View Dependent Claims (9, 10, 11, 12)
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13. A method of adjusting a magnitude of a transmit signal, comprising:
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receiving a transmit signal by using a receiving device; generating a digital error signal, responsive to the transmit signal, wherein the digital error signal represents a difference between an amplitude of the transmit signal and a reference level; periodically sampling the digital error signal once every predetermined increment of a clock signal; providing a transmit power control, responsive to a plurality of the sampled digital error signal signals; and adjusting the transmit signal, responsive to the transmit power control, wherein the transmit power control is provided based on whether an average error of the plurality of the sampled digital error signals exceeds a threshold error value. - View Dependent Claims (14, 15, 16, 17)
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Specification