Signal processing device possessing low-frequency frequency response compensating circuit
A signal processing device and compensation circuit technology, applied in the field of electric variable testing, to achieve the effect of solving the contradiction between high bandwidth and high precision, easy implementation, and simplified calibration methods
Active Publication Date: 2014-05-14
RIGOL
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to simplify the frequency response adjustment method; to solve the contradictory problem of high bandwidth and high precision in the compensation circuit
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Embodiment Construction
[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0050] refer to figure 2 , shows a schematic structural diagram of a preferred embodiment 1 of a signal processing device with a low-frequency frequency response compensation circuit. The signal processing device 200 of this preferred embodiment comprises an input terminal 201, an input coupling network 202, a first amplifier 203, an analog-to-digital converter 204, a variable gain amplifier 206, a processor system 205,
[0051] The input terminal 201 receives an external input signal a;
[0052] The input coupling network 202 performs attenuation and error amplification on the DC and low frequency of the external input signal a or attenuates and feedforward amplification on the intermediate frequency and high frequency, and obtains a superposition signal of an error amplification signal and a feedforward amplification signal e.
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The present invention discloses a signal processing device possessing a low-frequency frequency response compensating circuit. The signal processing device possessing the low-frequency frequency response compensating circuit comprises an input terminal used for receiving an external input signal; an input coupling network used for carrying out attenuation and error amplification on a DC and a low frequency of the external input signal, carrying out attenuation and feedforward amplification on an intermediate frequency and a high frequency, and obtaining a superposed signal of an error amplification signal and a feedforward amplification signal; a first amplifier used for amplifying the superposed signal and outputting an amplification signal; an analog-digital converter used for converting the amplification signal into a digital signal; a processor system used for generating a first control signal; and a variable gain amplifier used for adjusting the frequency response flatness of the signal processing device according to the first control signal. According to the present invention, the frequency response flatness of the signal processing device can be adjusted by just adjusting the variable gain amplifier, so that the problem in the prior art that the adjustment is complicated is solved, at the same time, the problem that the high broadband and high precision of the compensating circuit are contradictory mutually is solved.
Description
technical field [0001] The invention relates to the field of electric variable testing, in particular to a signal processing device with a low-frequency frequency response compensation circuit. Background technique [0002] In common signal processing devices, such as desktop oscilloscopes, virtual oscilloscopes and data acquisition cards, etc., it is generally expected that the frequency response of signal processing devices is relatively flat, but due to objective factors such as design errors, component errors, and environmental influences, the frequency response will be uneven. flat. refer to figure 1 , is a schematic circuit diagram of a frequency response compensation circuit disclosed in the prior art US Patent No. 12 / 571236, which includes an input attenuator 226 and a compensation amplifier circuit 224 connected in series in sequence. The input attenuator 226 is formed by parallel connection of a resistor 227 and a resistance-capacitance network composed of a resi...
Claims
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Inventor 严波王悦王铁军李维森
Owner RIGOL