Receiver and method for generating a control signal
First Claim
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1. A receiver, comprising:
- an amplifier which is responsive to a control signal to amplify an input signal, and which outputs a corresponding amplified signal;
a demodulator, coupled with the amplifier, which demodulates the amplified signal to generate first and second components;
a converter, coupled with the demodulator, which generates first samples corresponding to the respective first and second components, and which digitalizes the first samples; and
an auto gain controller (AGC), coupled with the converter, which generates second samples corresponding to the digitalized first samples, and which generates the control signal responsive to the second samples,wherein said AGC comprisesa digital filter which passes a predetermined signal component of the digitalized first samples to generate the second samples, andan AGC functional circuit which determines a power of the second samples, compares the power to a threshold level, and generates the control signal responsive to the comparison.
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Abstract
A receiver includes an amplifier which is responsive to a control signal to amplify an input signal and which outputs a corresponding amplified signal, a demodulator which demodulates the amplified signal to generate first and second components, a converter which generates first samples corresponding to the respective first and second components and which digitalizes the first sample, and an auto gain controller (AGC) which generates second samples corresponding to the digitalized first samples and which generates the control signal corresponding to the second samples.
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Citations
18 Claims
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1. A receiver, comprising:
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an amplifier which is responsive to a control signal to amplify an input signal, and which outputs a corresponding amplified signal; a demodulator, coupled with the amplifier, which demodulates the amplified signal to generate first and second components; a converter, coupled with the demodulator, which generates first samples corresponding to the respective first and second components, and which digitalizes the first samples; and an auto gain controller (AGC), coupled with the converter, which generates second samples corresponding to the digitalized first samples, and which generates the control signal responsive to the second samples, wherein said AGC comprises a digital filter which passes a predetermined signal component of the digitalized first samples to generate the second samples, and an AGC functional circuit which determines a power of the second samples, compares the power to a threshold level, and generates the control signal responsive to the comparison. - View Dependent Claims (2, 3, 4)
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5. A receiver comprising:
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an amplifier which is responsive to a control signal to amplify an input signal, and which outputs a corresponding amplified signal; a demodulator, coupled with the amplifier, which demodulates the amplified signal to generate first and second components; a converter, coupled with the demodulator, which generates first samples corresponding to the respective first and second components, and which digitalizes the first samples; and an auto gain controller (AGC), coupled with the converter, which generates second samples corresponding to the digitalized first samples, and which generates the control signal responsive to the second samples, wherein said AGC comprises a digital filter which removes a noise in the digitalized first samples to generate the second samples, a first AGC functional circuit which generates a first power of the second samples, a second AGC functional circuit which generates a second power of the digitalized first samples, and an AGC decision circuit which generates the control signal corresponding to the first and second powers. - View Dependent Claims (6, 7)
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8. A receiver comprising:
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an amplifier which is responsive to a control signal to amplify an input signal, and which outputs a corresponding amplified signal; a demodulator, coupled with the amplifier, which demodulates the amplified signal to generate first and second components; a converter, coupled with the demodulator, which generates first samples corresponding to the respective first and second components, and which digitalizes the first samples; and an auto gain controller (AGC), coupled with the converter, which generates second samples corresponding to the digitalized first samples, and which generates the control signal responsive to the second samples, wherein said AGC comprises a digital filter which removes a noise in the digitalized first samples to generate the second samples, a first AGC functional circuit which generates a first power of the second samples, a second AGC functional circuit which generates a second power of the digitalized first samples, a first equation circuit which calculates an average of the first power to generate a first control pulse, a second equation circuit which calculates an average of the second power to generate a second control pulse, and an AGC decision circuit which generates the control signal synchronized with the first and second pulses.
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9. A receiver comprising:
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an amplifier which is responsive to a control signal to amplify an input signal, and which outputs a corresponding amplified signal; a demodulator, coupled with the amplifier, which demodulates the amplified signal to generate first and second components; a converter, coupled with the demodulator, which generates first samples corresponding to the respective first and second components, and which digitalizes the first samples; and an auto gain controller (AGC), coupled with the converter, which generates second samples corresponding to the digitalized first samples, and which generates the control signal responsive to the second samples, wherein said converter comprises a direct-current amplifier which amplifies the first and second components, an analog filter which removes noise in the amplified first and second components to generate the first samples, and an analog-to-digital converter (ADC) which converts the first samples from analog to digital, wherein said control signal is a first control signal, and wherein said AGC comprises a digital filter which removes a noise in the digitalized first samples to generate the second samples, a first AGC functional circuit which generates a first power of the second samples, a second AGC functional circuit which generates a second power of the digitalized first samples, an AGC decision circuit which generates the first control signal and a second control signal synchronized with the first and second powers, and a controller which generates a third control signal responsive to the second control signal for controlling the direct-current amplifier. - View Dependent Claims (10, 11, 12)
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13. A receiver, comprising:
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a demodulator which demodulates an input signal to generate first and second components; a variable resister, coupled with the demodulator, which attenuates the first and second components responsive to first and second control signals; a converter, coupled with the variable resister, which generates first samples corresponding to the attenuated first and second components; and an auto gain controller (AGC), coupled with the converter, which generates second samples corresponding to the first samples, which generates the first control signal and a carry signal according to at least one peak value of the second samples, and which generates the second control signal according to the carry signal. - View Dependent Claims (14, 15)
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16. A receiver comprising:
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a demodulator which demodulates an input signal to generate first and second components; a variable resister, coupled with the demodulator, which attenuates the first and second components responsive to first and second control signals; a converter, coupled with the variable resister, which generates first samples corresponding to the attenuated first and second components; and an auto gain controller (AGC), coupled with the converter, which generates second samples corresponding to the first samples, which generates the first control signal and a carry signal according to at least one peak value of the second samples, and which generates the second control signal according to the carry signal, wherein said AGC comprises an analog filter which removes a noise in the first samples to generate the second samples, an adjuster circuit which adjusts an amplitude and phase of the first samples to the generate adjusted first samples, a differential amplifier which generates a difference between the second samples and the adjusted first samples to determine a noise amount, a comparator which generates the first control signal and the carry signal according to a comparison of a threshold value and a peak value of the noise amount, and an enable signal generator which generates the second control signal according to the carry signal.
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17. A receiver, comprising:
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a demodulator which demodulates an input signal to generate first and second components; a variable resister, coupled with the demodulator, which attenuates the first and second components responsive to first and second control signals; a direct-current amplifier, coupled with the variable resister, which amplifies the attenuated first and second components; and an auto gain controller (AGC), coupled with the direct-current amplifier, which generates at least one peak value of the amplified first and second components, which generates the first control signal and a carrier signal responsive to the peak value and a threshold value, and which generates the second control signal corresponding to the carrier signal.
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18. A method for generating a control signal, comprising:
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amplifying an input signal according to a control signal; demodulating an amplified signal to generate first and second components; generating first samples corresponding to the respective first and second components; digitalizing the first samples; generating second samples corresponding to the digitalized first samples; and generating the control signal responsive to the second samples, wherein said generating second samples comprises inputting the digitalized first samples through a digital filter that passes a predetermined signal component of the digitalized first samples as the second samples, and wherein said generating the control signal comprises determining a power of the second samples, comparing the power to a threshold level, and generating the control signal responsive to the comparison.
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Specification