Low-Cost Receiver Using Automatic Gain Control
First Claim
1. A receiver, comprising:
- a first programmable gain element having an input for receiving a radio frequency (RF) input signal, an output, and a control input, said first programmable gain element having gain steps of a first magnitude;
a signal processing circuit having an input coupled to said output of said first programmable gain element, and an output;
a second programmable gain element having an input coupled to said output of said signal processing circuit, an output, and a control input, said second programmable gain element having gain steps of a second magnitude that is smaller than said first magnitude; and
a controller having a first output coupled to said control input of said first programmable gain element, and a second output coupled to said control input of said second programmable gain element, wherein said controller adjusts a gain of the receiver by a first desired gain by changing a gain of said first programmable gain element by a first amount and also changing a gain of said second programmable gain element by substantially a corresponding inverse first amount, and subsequently changing said gain of said second programmable gain element incrementally by steps of said second magnitude to achieve said first desired gain.
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Accused Products
Abstract
A receiver (100) includes a first element (110) with a signal input, a control input, a signal output, and gain steps of a first magnitude, a signal processing circuit (120-168) with a signal input coupled to the first element, and a signal output, a second element (180) that has a signal input coupled to signal processing circuit, a control input, a signal output, and gain steps of a second magnitude smaller than the first magnitude, and a controller (180) that has a control output coupled to the first element (110), a control output coupled to the second element (180), and that adjusts receiver (100) gain by changing the first element (110) gain by a first magnitude, changing the second element (180) gain by substantially an inverse first magnitude, and subsequently changing the gain of the second element (180) by steps of the second magnitude to achieve a desired gain.
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Citations
20 Claims
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1. A receiver, comprising:
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a first programmable gain element having an input for receiving a radio frequency (RF) input signal, an output, and a control input, said first programmable gain element having gain steps of a first magnitude; a signal processing circuit having an input coupled to said output of said first programmable gain element, and an output; a second programmable gain element having an input coupled to said output of said signal processing circuit, an output, and a control input, said second programmable gain element having gain steps of a second magnitude that is smaller than said first magnitude; and a controller having a first output coupled to said control input of said first programmable gain element, and a second output coupled to said control input of said second programmable gain element, wherein said controller adjusts a gain of the receiver by a first desired gain by changing a gain of said first programmable gain element by a first amount and also changing a gain of said second programmable gain element by substantially a corresponding inverse first amount, and subsequently changing said gain of said second programmable gain element incrementally by steps of said second magnitude to achieve said first desired gain. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A receiver, comprising:
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a first programmable gain element for adjusting a gain of a radio frequency (RF) input signal to provide an adjusted RF input signal, and having gain steps of a first magnitude; a signal processing circuit for processing said adjusted RF input signal to provide a processed signal; a second programmable gain element for adjusting a gain of said processed signal to provide an output signal, said second programmable gain element having gain steps of a second magnitude that is smaller than said first magnitude; and a controller for adjusting a gain of the receiver by a desired gain by changing a gain of said first programmable gain element by a first amount and also changing a gain of said second programmable gain element by substantially a corresponding inverse first amount, and subsequently changing said gain of said second programmable gain element incrementally by steps of said second magnitude to achieve said desired gain. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method comprising:
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adjusting a gain of a radio frequency (RF) input signal by a first amount to provide an adjusted RF input signal using a gain step of a first magnitude; processing said adjusted RF input signal to provide a processed signal; adjusting a gain of said processed signal by substantially an inverse first amount to provide an output signal; and subsequently changing a gain of said output signal incrementally using a plurality of gain steps of a second magnitude to achieve a desired gain, said second magnitude being smaller than said first magnitude. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification