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Channel bias adjustment circuit of broadband digital oscilloscope

A technology of digital oscilloscope and regulating circuit, which is applied in the direction of digital variable display, etc., and can solve problems affecting the observation of input signals

Active Publication Date: 2011-08-17
UNI TREND TECH (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the noise in the bias adjustment circuit and the temperature drift of the integrated device will also be amplified together when they are amplified in the subsequent broadband programmable gain amplifier circuit, which seriously affects the observation of the input signal.

Method used

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  • Channel bias adjustment circuit of broadband digital oscilloscope
  • Channel bias adjustment circuit of broadband digital oscilloscope
  • Channel bias adjustment circuit of broadband digital oscilloscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Figure 4 It is a functional block diagram of a specific embodiment of the wideband digital oscilloscope channel bias adjustment circuit of the present invention.

[0034] In this example, if Figure 4 As shown, its circuit structure is consistent with the description of the content of the invention, and the measured input signal V i The high-frequency signal component passes through the coupling capacitor C 1 , resistance R 4 The high-frequency signal path composed of the direct output; while the measured input signal V i The low-frequency signal component passes through the resistor R 2 and R 3 divider, with the bias regulation voltage V adj After superposition and subtraction, the low-noise broadband operational amplifier U 1 output through resistor R 5 output; resistance R 4 , resistance R 5 respectively output the measured input signal V i The high-frequency signal components in and the measured input signal V adjusted by the bias voltage i The low-freq...

Embodiment 2

[0037] Figure 5 It is a functional block diagram of another embodiment of the wideband digital oscilloscope channel bias adjustment circuit of the present invention.

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PUM

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Abstract

The invention discloses a channel bias adjustment circuit of a broadband digital oscilloscope. A coupling capacitor C1 and a resistor R4 are combined to form a high pass signal path; the high-frequency signal component of a detected input signal is output by the capacitor C1 and the resistor R4; resistors R2 and R3 perform voltage division on a low-frequency signal component in the detected input signal, the low-frequency signal component is output through a resistor R5 at the output end of a low-noise high-precision operational amplifier after being subjected to superposition and subtraction with bias adjustment voltage Vadj. As the high-frequency signal component and the low-frequency signal component in the detected input signal are divided into different paths, the high-frequency signal component is directly output by the coupling capacitor C1 and the resistor R4; while only the low-frequency signal component can be subtracted from the bias adjustment voltage Vadj through the low-noise high-precision operational amplifier, and a formed direct current component and the low-frequency signal component are output by the resistor R5 and then superposed with the high-frequency signal component. Therefore, the defects that the traditional bias adjustment circuit is easy to be influenced by a parasitic capacitor to cause poor frequency response and flatness of a high-frequency signal, even cause high-frequency waveform distortion in serious condition, can be overcome.

Description

technical field [0001] The invention belongs to the technical field of digital oscilloscopes, and more specifically relates to a channel bias adjustment circuit of a broadband digital oscilloscope. Background technique [0002] Domestic digital storage oscilloscopes started late, mainly low-end oscilloscopes with low bandwidth and low sampling rate. The mid-to-high-end market is monopolized by the three major oscilloscope manufacturers in the United States, and the export of some high-speed devices is prohibited. In recent years, with the continuous progress and accumulation of domestic technology, the bandwidth of domestic oscilloscopes has entered the 1GHz era. To achieve accurate measurement of higher frequency signals, new requirements are put forward for the analog channel conditioning circuit. [0003] Generally, the input interface of the oscilloscope adopts BNC (Bayonet Nut Connector) or compatible BNC form, and the input terminal of the oscilloscope usually has two ...

Claims

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Application Information

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IPC IPC(8): G01R13/02
Inventor 叶芃邱渡裕刘义杨扩军
Owner UNI TREND TECH (CHINA) CO LTD