JPS59219006A - Electronic circuit device - Google Patents

Abstract

PURPOSE:To set a sweep time effectively by adding a circuit correcting a nonlinear input/output characteristic into a nearly linear input/output characteristic to a device having a nonlinear input/output characteristic. CONSTITUTION:Figure shows a correcting circuit, where the resistance value of resistors 21, 22 is selected equal as R1, the resistance value of resistors 23, 24 is selected equal as R2 and the resistance value of a resistor 27 is selected as R3. Further, a voltage of reference voltage terminals 8, 9 is taken as VREF1, VREF2 and the relation of them is selected as VREF1<VREF2. A voltage gain n1 when an input voltage VIN impressed to an input terminal 4 is nearly equal to VREF1 is expressed as n1=R3/2.R1. Further, a voltage gain n2 when the voltage VIN is increased more and nearly equal to the voltage VREF2 is expressed as n2=R3/ 2.R1+R3/2.R2. Thus, in selecting R1=1.5kohm, R2=0.75kohm, and R3=3kohms, n1=1 and n2=3 are obtained and the slope of the input/output characteristic is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to electronic circuit devices, and more particularly to an electronic circuit device in which an electronic circuit device having nonlinear input/output characteristics is corrected to have linear input/output characteristics.

Conventional configuration and problems thereof In FIG. 1, tuning is performed using a variable capacitance diode. For example, this is a block configuration diagram showing a part of the tuning section of a television receiver as simply as possible. 3 is a signal display section, which indicates, for example, a channel of an image displayed on a cathode ray tube.

FIG. 3 shows the tuning voltage VT applied to the terminal 1 of FIG. 1 and the channel number output to the signal display section 3, and particularly shows the tuning selectivity of the VHF band. As is clear from the figure,
The channel number selected with respect to the tuning voltage vT is non-linear. For example, in the so-called automatic tuning method in which the desired selected channel is obtained by automatically sweeping the tuning voltage (1)T, the following disadvantage arises. That is, there is an unnaturalness in that images are displayed at irregular intervals with respect to the sweep time. Furthermore, it takes a certain amount of time to visually check the state of one image and fix it to the desired channel, but in the case of non-linear input/output characteristics, the slope is the steepest. must match. Therefore, where the slope is small, there is a problem that time is wasted and the overall sweep time becomes longer.

OBJECTS OF THE INVENTION The present invention has been made to eliminate the above-mentioned disadvantages, and provides an electronic circuit device in which nonlinear input/output characteristics are corrected to become approximately linear.

Composition of the Invention The present invention corrects the nonlinear input/output characteristics to approximately linear input/output characteristics in a circuit device section configured with an electrical element having nonlinear input/output characteristics, an amplifier circuit device, a signal display device, or a combination thereof. The present invention is an electronic circuit device including a correction circuit device, which allows input and output to be substantially linear.

DESCRIPTION OF EMBODIMENTS FIG. 2 shows a diagram of an embodiment according to the present invention. The difference from the conventional example shown in FIG. 1 is that a correction circuit section 5 is added. This correction circuit section 5 has a function of substantially linearly correcting the nonlinear input/output characteristics shown by the solid line in FIG.

FIG. 4 shows a custom-made input/output of the correction circuit section 5, which is set to make the nonlinear input/output characteristic shown in FIG. 3 vague. That is, the relationship between the input voltage ■IN applied to the input terminal 4 and the tuning voltage ■T outputted to the terminal 1 is shown.

FIG. 5 shows the relationship between the input voltage N applied to the input terminal 4 and the channel number of the image displayed on the signal display section 3.

Hereinafter, the present invention will be described in detail with reference to FIGS. 2 to 5.

In Fig. 2, the input voltage ■IN applied to the input terminal 4
The relationship ΔCH/Δt between the sweep time t of The change meter of channel number CH is shown. Also, ΔCH
/Δ■T indicates the slope of the input/output characteristic at 3 inches from the terminal 1 to the signal display section. Further, Δ■T/ΔvtechN indicates the slope of the input/output characteristics of the correction circuit section 6.

Now, in order for the channel number to have a linear relationship with the change in sweep time t, ΔCH/Δt in the equation (1) above is required.
may be set so that it is constant.

Therefore, now, if Δ■workN/Δt is constant, (Δ
It is clear that it is only necessary to set ①, /ΔvN)·(ΔCH/ΔvT) to be constant.

Next, from FIG. 3, try to find ΔCH/ΔvT.

If we approximate the input/output characteristics of the H channel illustrated in Figure 3 with two straight lines whose slopes are shown as m11m2, and the slope of the input/output characteristics of the L channel with a straight line shown as m3, we get ml-1. (CH/V)2m2-%(CH2N)
9m3-% (CH/■).

Now, the slopes required of the correction circuit section 5 to correct the nonlinear input/output characteristics illustrated in FIG. n 2
, n s and, for example, if nl-1 is set, n2-3.
n3=2. That is, it is sufficient to arrange the correction circuit section 5 in which the slope of the output characteristic of the correction circuit section 5 is -n1=1 and n2=3°n3-2, respectively.

In FIG. 5, a correction circuit section is added, and the characteristics for correcting the H channel shown in FIG. 4 (←) and the characteristics for correcting the L channel shown in FIG.
It shows the characteristics converted into one straight line.

Here, in order to convert to one straight line, for example, L
Detects the input voltage "IN" at the boundary between channel number 3 of the channel and channel number 4 of the H channel,
For example, the L channel may be selected when IN=6.5V or less, and the H channel may be selected when IN=5.5V or more.

FIG. 6 shows a circuit diagram of a specific embodiment of the correction circuit unit 5. In FIG.

In the figure, 7 is a power supply terminal, 8 and 9 are reference voltage mediums, 11 and 12
are DC voltage application terminals, 13 and 14 are current source transistors, 15, 16, 21, 22, 23° 24 are emitter resistors, 17 to 20 are differential amplifier transistors, 25 is a diode, 26 is an output transistor, and 27 is a collector load resistance. Here, the same parts of VC as in Fig. 2 are marked with the same number -I).

Next, the operation will be explained. First, the resistance values of the resistors 21 and 22 are both equal and their value is R1, the resistance values of the resistors 23 and 24 are both equal and their value is R2, and the resistance value of the resistor 27 is R3. Furthermore, the reference voltage terminal 8°9 (Dson-tft'
7)'! It is assumed that the pressures 'i: "REF1" and "REF2" are selected, and the relationship between them is, for example, "REF1<"REF2.

When the input voltage IN applied to the input terminal 4 is almost equal to the reference voltage source vREF1, the voltage gain n1 is expressed as n1'5R3/2.R1- (2).

When the input voltage vIN is further increased and becomes almost equal to the reference voltage source vREF2, the voltage gain n2 is ・R2-R3/2-R1+R3/2-R2, , , , ,
,,(s).

Therefore, for example, R=1. rsKQ, R2=
o, -rrsKi), R3': If 3 is set to Ω, -n1=1°n2=3 is obtained. That is, it can be understood that the characteristics shown in FIG. 4) were selected by correcting the nonlinearity shown in FIG. 3 to almost linear input/output characteristics. Also, the characteristics shown in Figure 4 (E) are the same as those shown in Figure 3.
In order to correct the channel, a characteristic set to slope R3-2 is shown.

Next, in FIG. 4 (b), the value of the input voltage N1 at the switching point between the L channel and the L channel is
It is determined by F1, the resistance value R1 of the resistor 21.22, and the collector current Io1 of the transistor 13, and can be expressed as "lN1="REFl-101・R1".It is the input of the intersection of the slope nl and R2. The voltage ■IN2 can be set as ■IN2zVREF2−02·R2 (5), where the collector current of the transistor 14 is IO2.Here, the value of −■IN2 is the third
The intersection with the straight line approximated in figures (a) and (b), that is, ■
What is necessary is to set the point at which T-11■.

Note that in one embodiment of the present invention, the L channel is
I arranged a two-stage differential amplifier by approximating it with two straight lines, but
It is obvious that the number of stages of amplifiers should be set in accordance with the number of approximated straight lines, without the need for detailed explanation.

Effects of the Invention As explained using the above embodiments, according to the present invention, nonlinear input/output characteristics are corrected almost linearly.
For example, in a circuit device or the like that automatically sweeps an input voltage to obtain an output signal, the unnaturalness that the output signal is output at irregular intervals can be eliminated. Further, according to the present invention, it is possible to effectively set the above-mentioned sweep time suitable for operating an electronic circuit device or the like.

[Brief explanation of drawings]

FIG. 1 is a diagram simply showing a conventional tuning section of an electronic circuit device, FIG. 2 is a professional diagram showing an embodiment of the present invention, and FIG.
4 is a diagram showing the characteristics of the correction circuit section according to the present invention. FIG. 6 is a diagram showing the input/output characteristics of the electronic circuit device of the present invention. A specific circuit diagram is shown. 1: terminal, 2: nonlinear amplifier circuit section, 3: signal display section, 4: input terminal, 5: -1 correction circuit section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure: ″-J2 Figure 3 Figure 4 6B IO!2 14 /l Ill
20V7CV) IJ True Question False ζ Tosan Figure 4 VrN (V) Input Figure 5 2 4 4 B IQ /2 /4
Vm (V) Pressure input

Claims (1)

[Claims] An electronic device comprising a correction circuit device for correcting the nonlinear input/output characteristics to approximately linear input/output characteristics in a circuit device section constituted by an electrical element having nonlinear input/output characteristics, an amplifier circuit device, a signal display device, or a combination thereof. circuit device.