Receiver circuits with feedforward signal path

A technology of receivers and circuits, applied to electrical components, line fault/interference reduction, transmission systems, etc., can solve problems such as limiting the maximum gain

Active Publication Date: 2017-11-10
NXP BV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Impossible to amplify signals above the supply level, and thus this may limit the maximum gain that can be achieved elsewhere in the signal conditioning chain

Method used

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  • Receiver circuits with feedforward signal path
  • Receiver circuits with feedforward signal path
  • Receiver circuits with feedforward signal path

Examples

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Embodiment Construction

[0045] Signal conditioning is often required in wideband receivers and ADCs. The maximum level of signals present in an integrated circuit is usually limited by the range of supply voltages available. It is not possible to amplify signals above the supply level, and thus this may limit the maximum gain that can be achieved elsewhere in the signal conditioning chain.

[0046] figure 1 A circuit is shown that includes a feed-forward signal cancellation path that can be used to reduce signal levels. The feedforward path includes a zero order hold (ZOH) block 102 that samples the input signal (U) 104, a feedforward analog-to-digital converter (ADC) 106 that converts the sampled input signal (U) 104 into a digital (Y) signal, and a feed-forward digital-to-analog converter (DAC) 110 that produces an analog replica of said input signal (X). Feedforward ADC 106 converts input signal 104 using a sampling frequency (fs). figure 1 The circuit also includes a subtractor 112 that subtr...

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Abstract

A receiver circuit comprising: an input terminal configured to receive an input-signal; a feedforward-ADC configured to provide a feedforward-digital-signal based on the input-signal; a feedforward-DAC configured to provide a feedforward-analogue-signal based on the feedforward-digital-signal; a feedforward-subtractor configured to provide an error-signal based on the difference between the feedforward-analogue-signal and the input-signal; an error-LNA configured to provide an amplified-error-signal based on the error-signal; an error-ADC configured to provide a digital-amplified-error-signal based on the amplified-error-signal; a mixer configured to down-convert a signal in a signal path between the input terminal and the error-ADC; and an error-cancellation-block configured to provide an error-cancelled-signal based on a difference between the digital-amplified-error-signal and the feedforward-digital-signal.

Description

technical field [0001] The present invention relates to receiver circuits, and in particular to receiver circuits for processing an input signal comprising one or more blocks. Background technique [0002] Signal conditioning is often required in wideband receivers and ADCs. The maximum level of signals present in an integrated circuit is usually limited by the range of supply voltages available. It is not possible to amplify signals above the supply level, and thus this may limit the maximum gain that can be achieved elsewhere in the signal conditioning chain. Contents of the invention [0003] According to a first aspect of the present invention, the present invention provides a receiver circuit, the receiver circuit comprising: [0004] an input configured to receive an input signal; [0005] a feedforward ADC configured to provide a feedforward digital signal based on the input signal; [0006] a feedforward DAC configured to provide a feedforward analog signal bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/12
CPCH04B1/123H04B1/0007H04B1/109H03M1/001H03M1/1009H04L25/08
Inventor 穆罕默德·博拉特凯尔吕西安·约翰内斯·布伦默斯
Owner NXP BV
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