Power optimized ADC for wireless transceivers
First Claim
Patent Images
1. An apparatus comprising:
- an analog-to-digital converter (ADC) configured to convert an analog baseband signal of a radio frequency (RF) receiver from analog to digital, wherein an effective number of bits (ENOB) of the ADC is controllable; and
an ENOB control circuit configured to adaptively control the ENOB of the ADC based at least partly on one or more of a level of automatic gain control of the RF receiver, a level of the output range of the ADC, or an amount of interference, wherein the ENOB control circuit is further configured to adaptively reduce the ENOB of the ADC upon a determination that an automatic gain control error and a residual DC offset are less than worst case allotted amounts.
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Abstract
An analog-to-digital converter (ADC) of a radio receiver can consume a relatively large amount of power. It is typically desirable to minimize power consumption, particularly with battery-powered devices, such as in wireless receivers. In certain conditions, the effective number of bits (ENOB) required from an ADC of a receiver can vary. The power consumption of certain ADC topologies, such as pipelined converter topologies, can vary with the number of bits. One embodiment dynamically varies the ENOB of an ADC to more optimally consume power. This can extend battery life.
29 Citations
25 Claims
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1. An apparatus comprising:
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an analog-to-digital converter (ADC) configured to convert an analog baseband signal of a radio frequency (RF) receiver from analog to digital, wherein an effective number of bits (ENOB) of the ADC is controllable; and an ENOB control circuit configured to adaptively control the ENOB of the ADC based at least partly on one or more of a level of automatic gain control of the RF receiver, a level of the output range of the ADC, or an amount of interference, wherein the ENOB control circuit is further configured to adaptively reduce the ENOB of the ADC upon a determination that an automatic gain control error and a residual DC offset are less than worst case allotted amounts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus comprising:
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an analog-to-digital converter (ADC) configured to convert an analog baseband signal of a radio frequency (RF) receiver from analog to digital, wherein an effective number of bits (ENOB) of the ADC is controllable; an ENOB control circuit configured to adaptively control the ENOB of the ADC based at least partly on one or more of a level of automatic gain control of the RF receiver, a level of the output range of the ADC, or an amount of interference; an interference scanner configured to determine an amount of interference that is present in an RF signal associated with the analog baseband signal; and wherein the ENOB control circuit is configured to adaptively control the ENOB based on the determined output range, on the level of automatic gain control for an RF signal associated with the analog baseband signal, and the amount of interference.
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13. A method of dynamically adjusting an analog-to-digital converter (ADC) of a radio frequency (RF) receiver, the method comprising:
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converting an analog baseband signal of the RF receiver from analog to digital with the ADC; and adaptively controlling an effective number of bits (ENOB) for conversion of the analog baseband signal by the ADC based at least partly on one or more of the level of automatic gain control, a level of the output range of the ADC, or an amount of interference; determining an amount of interference that is present in an RF signal corresponding to the analog baseband signal; and adaptively controlling the ENOB based on the determined output range, on the level of automatic gain control for an RF signal associated with the analog baseband signal, and the amount of interference. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of dynamically adjusting an analog-to-digital converter (ADC) of a radio frequency (RF) receiver, the method comprising:
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converting an analog baseband signal of the RF receiver from analog to digital with the ADC; and adaptively controlling an effective number of bits (ENOB) for conversion of the analog baseband signal by the ADC based at least partly on one or more of the level of automatic gain control, a level of the output range of the ADC, or an amount of interference, wherein adaptively controlling comprises adaptively reducing the ENOB upon determining that an automatic gain control error and a residual DC offset are less than worst case allotted amounts.
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Specification