Dual receive filter
First Claim
1. A pre-processing stage for a receiver of a wireless device, wherein the pre-processing stage comprises:
- a) an amplifier that receives signals of interest and unwanted signals and provides amplified signals of interest and amplified unwanted signals;
b) a matching network connected to the amplifier, the matching network being configured for separating the amplified received signals of interest from the amplified unwanted signals in conjunction with additional downstream filters;
c) a signal path connected to the matching network, the signal path including components for receiving and pre-processing the amplified signals of interest; and
, d) a shunt path connected to the matching network, the shunt path including components for adjusting reflected energy sent back to the amplifier for limiting the output swing of the amplifier in a frequency band corresponding to the amplified unwanted signals.
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Accused Products
Abstract
A pre-processing stage is provided for a receiver of a wireless device. The pre-processing stage includes an amplifier that receives signals of interest and unwanted signals and produces amplified signals of interest and amplified unwanted signals, and a matching network that separates the amplified signals of interest from the amplified unwanted signals in conjunction with additional downstream filters. The preprocessing stage also includes a signal path that includes components for receiving and pre-processing the amplified signals of interest, and a shunt path that includes components for adjusting reflected energy sent back to the amplifier for limiting the output swing of the amplifier in a frequency band corresponding to the amplified unwanted signals.
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Citations
16 Claims
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1. A pre-processing stage for a receiver of a wireless device, wherein the pre-processing stage comprises:
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a) an amplifier that receives signals of interest and unwanted signals and provides amplified signals of interest and amplified unwanted signals;
b) a matching network connected to the amplifier, the matching network being configured for separating the amplified received signals of interest from the amplified unwanted signals in conjunction with additional downstream filters;
c) a signal path connected to the matching network, the signal path including components for receiving and pre-processing the amplified signals of interest; and
,d) a shunt path connected to the matching network, the shunt path including components for adjusting reflected energy sent back to the amplifier for limiting the output swing of the amplifier in a frequency band corresponding to the amplified unwanted signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for improving the linearity in a pre-processing stage of a receiver used in a wireless device, the method comprising:
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a) receiving signals of interest and unwanted signals;
b) amplifying the signals of interest and the unwanted signals with an amplifier to generate amplified signals of interest and amplified unwanted signals;
c) providing a matching network and additional downstream filters for separating the amplified received signals of interest from the amplified unwanted signals;
d) providing a desired signal path at the output of the matching network with components for receiving and pre-processing the amplified signals of interest; and
,e) providing a shunt path at the output of the matching network, in parallel with the signal path, with components for adjusting reflected energy sent back to the amplifier for limiting the output swing of the amplifier in a frequency band corresponding to the amplified unwanted signals. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification