DC offset calibration of wireless receivers
First Claim
1. A receiver system comprising:
- an automatic gain control (AGC) circuitry configured tocontrol a first gain control signal to a first gain element having variable gain control;
control a second gain control signal to a second gain element having variable gain control;
a DC (direct current) offset correction circuitry coupled to the AGC circuitry, the DC offset correction circuitry configured totrigger the AGC circuitry to output a set of calibration gain control signals to the first and second gain elements;
capture a set of DC offset measurements of a first signal received at the DC offset correction circuitry, wherein the first signal is passed by the first and second gain elements;
estimate DC offset components using the set of DC offset measurements, the DC offset components including a first DC offset component that is a function of low noise amplifier gain and baseband filter gain, a second DC offset component that is a function of the baseband filter gain without the low noise amplifier gain, and a third DC offset component that is a function of the baseband filter offset and analog to digital converter offset;
calculate a first correction control signal corresponding to a first gain level of the first gain element using the DC offset components;
calculate a second correction control signal corresponding to the first gain level of the second gain element using the DC offset components.
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Accused Products
Abstract
A receiver system includes an automatic gain control (AGC) module configured to control a first gain control signal to a first gain element having variable gain control. The receiver system also includes a DC (direct current) offset correction block coupled to the AGC module, the DC offset correction block configured to trigger the AGC module to output a set of calibration gain control signals to the first gain element and capture a set of DC offset measurements of a first signal received at the DC offset correction block, where the first signal is passed by the first gain element. The DC offset correction block is further configured to estimate one or more DC offset components using the set of DC offset measurements, and calculate a first correction control signal corresponding to a first gain level of the first gain element using the one or more DC offset components.
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Citations
19 Claims
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1. A receiver system comprising:
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an automatic gain control (AGC) circuitry configured to control a first gain control signal to a first gain element having variable gain control; control a second gain control signal to a second gain element having variable gain control; a DC (direct current) offset correction circuitry coupled to the AGC circuitry, the DC offset correction circuitry configured to trigger the AGC circuitry to output a set of calibration gain control signals to the first and second gain elements; capture a set of DC offset measurements of a first signal received at the DC offset correction circuitry, wherein the first signal is passed by the first and second gain elements; estimate DC offset components using the set of DC offset measurements, the DC offset components including a first DC offset component that is a function of low noise amplifier gain and baseband filter gain, a second DC offset component that is a function of the baseband filter gain without the low noise amplifier gain, and a third DC offset component that is a function of the baseband filter offset and analog to digital converter offset; calculate a first correction control signal corresponding to a first gain level of the first gain element using the DC offset components; calculate a second correction control signal corresponding to the first gain level of the second gain element using the DC offset components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A semiconductor device comprising:
a receiver system including; a first gain element; a second gain element; and a DC (direct current) offset correction circuitry configured to capture a set of DC offset measurements of a first signal received at the DC offset correction circuitry, wherein the first signal is passed by the first and second gain elements; estimate DC offset components using the set of DC offset measurements, wherein a first DC offset component is estimated based on a difference between high and low low noise amplifier gain and low baseband filter gain, a second DC offset component is estimated based on a difference between high baseband filter gain and the low baseband filter gain, and the low low noise amplifier gain, and a third DC offset component is estimated based on the baseband filter offset and analog to digital converter offset; and calculate correction calibration signals corresponding to a first gain level of the first gain element using the DC offset components.
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15. A method of operating a receiver system comprising:
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triggering an automatic gain control (AGC) circuitry of the receiver system to output a set of calibration gain control signals to gain elements having variable gain control; capturing a set of DC offset measurements of a first signal, wherein the first signal is passed by the gain elements; estimating DC offset components using the set of DC offset measurements based on a difference between high and low low noise amplifier gains, and low baseband filter gain for a first of the DC offset components, low low noise amplifier gain and a difference between high and low baseband filter gains for a second of the DC offset components, and baseband filter offset and analog to digital converter offset for a third of the DC offset components; and calculating correction calibration signals over a range of gain levels of the gain elements using the DC offset components. - View Dependent Claims (16, 17, 18, 19)
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Specification