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Analog to digital conversion system

A technology of analog-to-digital conversion and analog-to-digital converter, applied in the direction of analog-to-digital converter, FM carrier system, spectrum analysis/Fourier analysis, etc., can solve problems such as the difficulty of analog-to-digital converters, and achieve excellent dynamic range and broadband belt, simplifies the RF circuit, and reduces the cost

Active Publication Date: 2012-11-14
TEKTRONIX INC
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Problems solved by technology

[0004] However, satisfying both wide dynamic range (= large number of bits) and wide frequency bandwidth (= high sampling frequency) is very difficult for existing ADCs

Method used

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  • Analog to digital conversion system
  • Analog to digital conversion system

Examples

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Embodiment Construction

[0016] figure 2 is a block diagram of a signal analyzer 30 including an analog-to-digital conversion system 32 according to an embodiment of the present invention. It has a CPU, a hard disk drive, a mouse, etc., which are well known in PCs although they are not shown. The user can establish necessary settings such as the center frequency and bandwidth of the frequency band in the input signal Sin that the user wants to measure through an operation panel (not shown).

[0017] The frequency conversion stage 34 receives the input signal Sin, and generates an intermediate frequency (IF) signal Sif having a suitable frequency band according to the frequency band set by the user (which is defined by the center frequency and the bandwidth of the user's desired frequency band in the input signal Sin), and the resulting The above frequency band is used in the AD converter described below. exist figure 2 , the mixer 38 and the local oscillator 40 up-convert the frequency to higher ...

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Abstract

While combining AD converters that one is wide band but narrow dynamic range and the other is narrow band but wide dynamic range, it allows settings to provide a common intermediate frequency signal to the AD converters. A first BPF 50 provides a first AD converter 54 with the output signal obtained by getting an intermediate frequency signal Sif through a first band in the second Nyquist zone ofthe first AD converter 54. A second BPF 52 provides a second AD converter 56 with the output signal obtained by getting the intermediate frequency signal Sif through a second band in the third Nyquist zone of the second AD converter 56. At this time, the second band is set in the center portion of the second Nyquist zone band, and the first band is set in the center portion of the band of the intermediate frequency signal.

Description

technical field [0001] The invention relates to an analog-to-digital conversion system, especially an analog-to-digital conversion system that realizes a simplified frequency conversion circuit while satisfying wide dynamic range and wide frequency band. Background technique [0002] Signal analyzers are used to analyze the signals of wireless devices such as mobile phones from both time domain and frequency domain perspectives. A signal analyzer converts the analog signal under test into digital data that is digitally processed, for example using an FFT, to produce frequency domain data. [0003] Signal analyzers are required to have a wide dynamic range and a wide frequency band. The key is to satisfy both a wide dynamic range and a wide frequency band in analog-to-digital conversion. [0004] However, satisfying both a wide dynamic range (=large number of bits) and a wide frequency band (=high sampling frequency) at the same time is very difficult for existing analog-to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12G01R23/16H04L27/14
CPCG01R23/16
Inventor 奈良明
Owner TEKTRONIX INC
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