JPS58142649A - System for measuring response time of analog signal circuit - Google Patents

Abstract

PURPOSE:To automate the measurement of response time, by detecting the peak point of the output waveform of an analog circuit, digitizing the detected signal through AD conversion, and then, calculating the response time of the analog circuit with the digital signal. CONSTITUTION:A control circuit, upon reception of a start signal (a), is set to the waiting condition and waits for an output signal (c) of a circuit 3 to be measured. When the signal (c) exceeds a level, the control circuit outputs a measurement starting instruction to the whole measuring section 4a and, at the same time, a start signal (k) to a computer 11, respectively. Then, a zero-cross detecting circuit 7 performs polarity discrimination on the waveform of the signal (c) and outputs a signal (f) or (g) by moving a pulse peak holding the circuit 5 or minus peak holding circuit 6 corresponding to a control signal (d) or (e), and simultaneously outputs an instruction (j). Upon reception of the instruction (j), an AD converting circuit 10 converts a peak holding value (h) and sends a lead timing signal (l) necessary for the calculating of respnse time and a converted deata signal (m) to the computer 11.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to analog signal circuits in communication equipment such as modulation/demodulation equipment, response time θ) measurement, and special ζ
Improvement of measurement method suitable for automation of k'e (this rη3j
1-0(b) Background of the Technology 11 Recent developments in communication technology In the Ipζ reception of Ana 0711, transmutation devices are widely used. The automatic gain control circuit of this device has a fillet;
The Vr response characteristics of the glaze with respect to the input waveform are shown. The output waveform follows the input waveform with a certain delay.

Therefore, when the input level changes, it takes time to reach the new level, and this is called the response time. This guy has a strong sword, but he can't avoid it, so P! It is set and manufactured so as to keep the time less than 1Tπ (for example, 1Qms) to ensure quality. Measuring the response time required at this time is a labor-intensive and labor-intensive task, and when mass-producing equipment, there is a need for labor-saving response time measurement. Automatic gain sub-side 1 circuit of 6111>e
Example of measurement using a circuit O] Regarding the conventional method, the first is 1 & H 91 V 1 special open 1 gamma cast 1'' 14 years old A. Fig. 1 is a block diagram showing the conventional method (1>1), and Fig. 2 shows a waveform diagram of Fig. 1. In the figure, 1 is the oscillator, 2 is the signal control circuit, 3 is the circuit under test, 4 is the oscilloscope, a is the measurement start signal, b is the input signal, C is the output signal, E is the final point of the signal stabilization section, S represents standard value, U represents assovarimint, L represents lower limit, and t represents response time.

As shown in Figure 1, an oscillator 1 and a signal control circuit 2
, a circuit under test 3 and an onroscope 4 are connected in series, and a signal control circuit 2 and an oscilloscope 4 are further connected. The oscillator 1 generates a test signal of a predetermined frequency, and the signal control circuit 2 has a function of passing the signal input from the oscillator 1 for a necessary length of time. The oscilloscope 4 measures the waveform of the signal output from the circuit under test 3.

Since we have such a configuration, f
This test signal is input to the circuit under test 3 via the control circuit 2 as a signal 1). Then, as shown in FIG. 2, the measuring circuit 3 which has received the input waveform signal C sends an output signal C to the oscilloscope 41.

-The force signal control circuit 2 connects the oscilloscope 4 (
A measurement start signal a is generated to match the start θ) timing. At this timing (therefore, the cathode ray tube draws the output signal Cθ on the screen) waveform. The waveform of the output signal C appearing on the cathode ray tube is visually read on the scale, data is taken, and the response time t of the signal circuit is determined. That is, in the waveform of the output signal C shown in FIG. 2, for example, a transient phenomenon 5 which initially swings like a dog d) but gradually stabilizes.
After a while, it approaches a certain value. The value at the final point E of the stable part of this signal is set as the standard value S, and the allowable individual difference is added or subtracted to this value (for example, ±10%) to obtain the upper limit. The response time t is the time it takes to reach a stable state of ζ. An oscilloscope (a memory scope or a digital memory scope may also be used).

In this way, the response time t can be measured h2.

However, the 1 Prayer 1 (Koyoru method) measures by looking at the flickering autumn image of Brown 3-U and using a scale, so there is a drawback that there is a limit to the accuracy of the foot measurement as it takes four minutes.

Automation was required to perform visual measurements without human intervention (there was a key element of labor saving. For this reason, a computer was connected to the oscilloscope memory scope, and the waveform was measured using the oscilloscope speed link). A method is used in which 1iU is calculated at the time of response after storing the data up to the final end. Sometimes. However, this method has the disadvantage that the converter (the scale that stores a huge amount of data) is only a 1 piece program.

(d) Purpose of the invention The purpose of the present invention is to solve the following drawbacks:
Providing a response time measurement method that performs boost processing using the peak value of the output waveform of the analog signal N path (Q) Automation is possible.ノ戊The present invention is a human-powered method for measuring the test signal (analog input h@circuit 0) output (if bow - waveform measurement means (thus mll > pi, one core analog input h@circuit 0). I stay overnight
Q) Output signal -4 = A measuring force type that measures the response time until the waveform level becomes stable, and the measuring means is the output of the analog signal circuit O) Peak detecting means that detects the peak point of the signal waveform and,
The peak point detection signal detected by the detection means is converted by the analog-to-digital conversion stage, and the response time of the analog signal circuit is determined based on the converted digital value. Performance')-1-
This is a method for measuring the response time of N-path analog signals, characterized in that the method is configured to perform the following steps. You can achieve your goals by increasing your strength.

(f) Examples of the invention The present invention Q)-Embodiment will be explained below with reference to FIG.

FIG. 3 is a block diagram showing an embodiment according to the invention, and FIG. 4 is a waveform diagram of the third section. In the figure, 4a is a rectangle measuring section, 5 is a Noras heat hold circuit, 6 is a minus peak hold circuit, 7 is a zero cross detection circuit, 8 is a control circuit,
9 is an analog signal switching circuit, 10 is an analog-to-digital conversion circuit, 1 is a computer, d is a control signal for the glass beak hold circuit, e is a control signal for the negative peak hold circuit, and f is a positive peak hold circuit. The output signal, g is the output signal of the minus peak hold circuit, ll is the signal of the selected peak hold value,
j is an analog-to-digital conversion command signal, ! indicates the start @ number, Y indicates the read timing signal, and hem indicates the digital take signal. The same parts as in FIGS. 1 and 2 are indicated by the same reference numerals.

In Fig. 3, the part surrounded by the two-dot chain line is the measuring part 4a, which is the part that replaces the on-loss course 4 read out in Fig. 1. A positive peak hold circuit 5, a negative peak hold circuit 6, and a cross detection circuit 7 are provided in parallel to detect the point where the output signal C from the circuit 3 crosses the peak, negative peak, and cross line. has been done.

Im w start '+585: Uke is a control circuit IIl with the function of controlling the entire circuit? 58
is provided. Furthermore, an analog switching circuit 9 is provided and connected to the glass peak hold circuit 5 and the negative peak hold circuit 6.The analog switching N path 9 has a function of switching a plurality of analog inputs (M f1g). ] Switched and comes out 1
An analog-to-digital conversion circuit 1O is provided to convert this signal into digital, and the circuit that receives the signals j and h from the control circuit 8, zero cross detection circuit 7, and analog switching N path 9 is indicated by the dashed dotted line in the figure. Show me this computer li hard timing master! and data signal m5-
When measuring using the 1IllI rectangular section 4a, the signal waveform as shown in FIG. ．．
1' operation. First, the control circuit 8 which has set the measurement start toy h-8'a is in a standby state, and the circuit under test 3
Waiting for U1 issue C to come out.

When the output signal C exceeds a certain level, the output signal C exceeds a certain level.
At the same time as issuing an overall measurement start command, a start point signal k is sent to the computer 1 (informing that the measurement has started). The polarity of the waveform C is determined, and the control signals d and e correspond to -σ'. 9Q) Select the passage route and when the peak is passed, analog-to-digital conversion circuit 1
Convert to 0 command j5: Issue.

The analog-to-digital converter circuit JO that received the conversion command J converts the peak hold value 11, and upon completion of the conversion, converts it into a read timing signal l for the computer lf.
Send this data conversion number 1) 1. The computer 1 stores data in correspondence with the time point and the take number.The control circuit 8 also stops the circuit one hour after the start point.The converter receives the stop signal and stores the data (-) in correspondence with the time point and the take number. Part Q) Set the data at the final point E to the standard (+1), calculate the allowable deviation of the response from this standard value, obtain the raparimint U and lower limit L, and compare the value with each stored peak value. At this time, a comparison is made from the final data side to the time trough, and the response limit time is recognized when the VF arrival value is exceeded. That is, in this case, the number of takes transferred is 10 (-1), and there is no human power (.

8- Since the frequency at which the data is obtained is known, in the case of Fig. 4, the time can be found from the number of the obtained data. In this way, the circuit σ1 transient response time to reach an arbitrary level can be easily processed by 4f computer processing (
It's shallow to ask too much. Although the above embodiment describes an example of a modulation/demodulation device, it is of course applicable to measuring the response time of an analog signal circuit such as a filter.

(g) Detailed Description of the Invention The present invention as described in 1. For example, a peak hold circuit for the output waveform of an analog signal circuit, a zero cross detection circuit, and an analog-to-digital conversion circuit are used to store the negative peak values of the AC input signal, and create a storage string of the peak values. By calculating the response time of the human waveform (Q), it is possible to obtain the response time of the human waveform (Q).
This method also has the effect of automating the measurement.

Connect a converter such as an oscilloscope to perform high-speed scanning.
'Ah Shooting (B #, /I s ZL4! Genk f
This method has the effect of making the program extremely simple and quick compared to the method of memorizing the playing time and then regulating the playing time.

[Brief explanation of the drawing]

Fig. 1 is a block diagram illustrating the conventional method, and Fig. 2 is a block diagram illustrating the conventional method.
3 is a block diagram showing an embodiment according to the present invention C, and FIG. 4 is a waveform diagram of FIG.
3 is a side foot circuit, 4 is an oscilloscope, 4a is a foot measuring section, 5 is a glass beak bold circuit, 6 is a minus peak hold circuit, 7 is a zero loss detection direction path, 8 is a control circuit, 9 is an analog A signal switching circuit, 10 a log-to-digital conversion circuit, and 11 a computer. -11= 11 Figure 22

Claims (1)

[Claims] A measurement method that inputs a test signal, measures the output signal waveform of an analog signal circuit in response to the test signal using a measuring means, and measures the response time until the output signal waveform level of the analog signal circuit becomes stable, The measuring means includes a peak detecting means for detecting a peak point of a signal inversion of the output of the analog signal circuit, and an analog-digital converting means, and converts the peak point detection signal detected by the detecting means into the analog-digital signal. converted by a conversion means,
A method for calculating the response time of an analog signal circuit, characterized in that the response time of the analog signal circuit is calculated based on the converted digital signal.