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US 8,559,903 B2Granted
Feedforward automatic gain correction
AssigneeNXP B.V.
InventorsHenk Ten Pierick, Gertjan Groot Hulze, Erik Keukens
Life of this patent
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Abstract
An automatic gain control circuit is provided for an input signal in the form of a dc reference level and a superposed amplitude modulated ac data signal. A feedforward AGC loop has a low pass filter for deriving the level of attenuation from the attenuated dc reference level. A multiplier value (G) is based on the reciprocal of the level of attenuation (α) and this multiplier enables an output signal to be generated comprising a constant multiple (DG) of the input signal.
Claims18
An automatic gain control circuit, comprising:
- an input configured to receive a variably attenuated input signal, the variably attenuated input signal comprising both a dc reference level and a superposed ac data signal;
- a feedforward path comprising:
- a low pass filter configured to derive a level of attenuation from the dc reference level;
- and
- a unit configured to derive a multiplier value, based on a reciprocal of the level of attenuation;
- and
- a multiplier configured to multiply the variably attenuated input signal with the multiplier value to derive an output signal comprising a constant multiple of the variably attenuated input signal.
4 more elements
An automatic gain control method, comprising:
- receiving a variably attenuated input signal, the variably attenuated input signal comprising a dc reference level and a superposed amplitude modulated ac data signal;
- low pass filtering the variably attenuated input signal to derive a level of attenuation from the dc reference level;
- deriving a multiplier value, based on a reciprocal of the level of attenuation;
- and
- multiplying the variably attenuated input signal with the multiplier value to derive an output signal comprising a constant multiple of the variably attenuated input signal.
2 more elements
Dependencies are inferred from the claim text.