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A frequency selective circuit configured to convert an analog input signal to a digital output signal

A technology of analog input signal and digital output signal, applied in the field of frequency selective circuit, can solve the problem of signal bandwidth conflict and so on

Active Publication Date: 2015-10-28
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Although WO 2012 / 073117 describes a useful improvement, the additional noise shaping provided by CSF is only first order and there is a conflict with CSF and signal bandwidth, so further improvements are needed

Method used

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  • A frequency selective circuit configured to convert an analog input signal to a digital output signal
  • A frequency selective circuit configured to convert an analog input signal to a digital output signal
  • A frequency selective circuit configured to convert an analog input signal to a digital output signal

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Embodiment Construction

[0050] figure 1 A block diagram of a typical RF transceiver 1 in which the invention may be used is shown. The transceiver 1 has a receiver part and a transmitter part. Most modern transceiver solutions use direct conversion (or low IF) receiver and transmitter architectures to reduce complexity and minimize power consumption. The receiver and transmitter use quadrature local oscillator signals.

[0051] Antenna 2 and transmitter / receiver switch 3 are connected. The transmitter section includes a power amplifier 4 and a PA matching and filtering block 5, but will not be described in detail below.

[0052] In the receiver section, (for frequency division multiplexing FDD or time division multiplexing TDD systems respectively) the signal from the transmitter / receiver switch 3 is fed to a duplexer or RX filter 6 (e.g. Surface Acoustic Wave (SAW) filter), duplexer or RX filter 6 provides the only frequency selectivity before the RX mixer. The signal is fed from the duplexer o...

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PUM

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Abstract

A frequency selective circuit configured to convert an analog input signal to a digital output signal comprises an analog-to-digital converter (44) to generate the digital output signal of the circuit based on an analog input signal to the analog-to-digital converter (44); a digital-to-analog converter (46, 47) to generate an analog feedback signal based on the digital output signal from the analog-to-digital converter (44), and an analog filter arranged to generate the analog input signal to the analog-to-digital converter based on the analog feedback signal and an analog input signal to the circuit. The analog filter comprises at least two integrators (41, 42) in series, each having a feedback path comprising the analog-to-digital converter (44) in cascade with a digital- to-analog converter (46, 47), so that the overall noise transfer function of the circuit has at least two zeros in addition to zeros in the noise transfer function of the analog-to-digital converter.

Description

technical field [0001] The invention relates to a frequency selective circuit configured to convert an analog input signal into a digital output signal, comprising an analog-to-digital converter, a digital-to-analog converter and an analog filter. [0002] The work leading up to this invention has received funding from Euratom's Seventh Framework Program (FP7 / 2007-2013) under grant agreement n° 248277.12. Background technique [0003] In a radio frequency or wireless communication system, a radio frequency (RF) receiver is the basic building block. Zero-IF and low-IF receiver (RX) architectures dominate today's low-cost wireless receiver market. For such receivers, the desired signal is down-converted to DC or near DC by the RX mixer. Before this mixer, the only frequency selectivity offered (for frequency division multiplexing FDD or time division multiplexing TDD systems respectively) is usually band selectivity via duplexers or RX (Surface Acoustic Wave, SAW) filters. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/00
CPCH03M3/344H03M3/368H03M3/454H03M3/464
Inventor 斯文·马特森马蒂亚斯·帕姆彼得罗·安德雷阿尼马丁·安德森
Owner TELEFON AB LM ERICSSON (PUBL)