JPS5967464A - Output level shift circuit - Google Patents

Abstract

PURPOSE:To make it possible to shorten the measuring times of two signal characteristics of a receiver, by shifting the output level of a reference signal in a predetermined amount in operating a set switch. CONSTITUTION:When a set switch 16 is operated, the points A, B of a change- over device 15 are connected while the data of an attenuation amount to be shifted from a memory apparatus 19 is read to be transmitted to an operator 20. In this operator 20, the substraction of the data of an already inutted output level amount and the data of the shift attenuation amount from the memory appratus 19 is performed and the subtraction data is sent to a variable attenuator 11. By this method, the attenuator 11 is controlled by the attenuation amount and a reference signal is obtained in the output thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an output level shift circuit, particularly a standard signal generator in which the output level can be arbitrarily varied using a level setter, in which the output level of a Vc standard signal is adjusted to a desired level each time a set switch is operated. This relates to an output level shift circuit whose output level is shifted by a certain amount.

When measuring the No. 24g characteristics of a receiver, as shown in FIG. It is connected to the standard signal generating device 2 to be outputted by the No. 24M pad 3, and its output receiver (a 4a 4 plus +1
111. At this time, the output level of the standard signal output from the standard signal generator 1 or 2 may be regularly attenuated by a certain level amount and then measured.

What is the standard signal output level of conventional standard signal generators? r,
l0 (dB) x Tezzo, or 1 [dB): x step υ
Since the attenuator operates in decimal units, for example, if you want to attenuate the output level of a standard signal in steps of 6 (dB), set the level setter to the calculated value each time. There was an inconvenience that had to be had.

The non-invention is due to the fact that the output level of the standard signal outputted from the standard signal generator every time the set switch is fully operated is set to the desired level - the shift control is performed in total steps. It is an object of the present invention to provide an output level shift circuit in which i'l and the desired (1) level amount can be arbitrarily set. Therefore, the output level shift circuit of the present invention includes a variable attenuator that completely attenuates the standard signal, a level setter that specifies the output level, and an output level of the N4 signal υ arbitrary υ that is output to the output terminal by operating the level setter. A standard signal generator for outputting,
a shift data input key for inputting an attenuation signal to shift the output level set by the output level setter by a desired level amount; and the attenuation electric signal input by the shift data input key. A storage device for storing the output signal of the level setter, an arithmetic unit for reading out the output signal of the level setter from the storage device, and outputting the attenuation amount signal, the total input voltage, and the difference thereof to the variable attenuator. and a switch provided between the arithmetic unit and the storage device, and a set switch for controlling the switch to be fully turned on, and when the set switch is operated, an output is output to an output terminal; A feature of the present invention is that the output level of the quasi-signal is shifted by a desired level amount. An embodiment of the present invention will be described below using the 21st prisoner.

FIG. 2 shows the configuration of an embodiment of the output level shift circuit according to the present invention, and in the figure, reference numeral 11 indicates variable attenuation. C 12 is a level setting device, 13 is a level setting dial, 14 is a level encoder, 15 is a switch, 16 is a set switch,
17 is a reset switch, 18 is a shift data input key
119 is a storage device, 20 is an arithmetic unit, 21 is a switch, 22
23 represents an input key, and 124 represents an adder.

The variable attenuator 11 attenuates the standard signal input to the variable attenuator 11 according to the signal output from the arithmetic unit 20 and outputs the resultant signal.

The level setting device 12 is a setting device that determines the output level of the standard signal output from the variable attenuator 11 when the reset switch 17 is activated, and the level setting dial 13.
Level encoder 14. Input key 23. It has 20 additive marriages.

The level setting dial 13 is output to the output terminal.

This is a dial switch that changes the output level of the standard signal, for example, in 1 (dB) steps and in o, laB:] stars.

The level encoder 14 encodes the output level set by the level setting dial 13, and determines whether it is the output level set by the level setting dial 13. It is output to the adder 20.

The switch 15 turns on A and B by the set switch 16 (fJI'fEM, that is, the storage device 19 and the arithmetic unit 2
0 or n-, A and B are interrupted by the operation of the reset switch 17.

In addition to switching the switch 15 described above, the set switch 16 is used to switch the attenuation amount signal stored in the storage device 19iC, that is, the amount of attenuation to be shifted, while the set switch 16 is in operation, that is, when it is pressed. D of vessel 21
and F are connected.

The reset switch 17 is a switch for cutting off the switch 15 (/JA and B4).

The shift data input key 18 stores the amount of attenuation t to be shifted to the standard output level of each issue υ - memory device 191C 1. It's an input device that you can shake.

The storage device 19 is a device that stores the attenuation amount to be shifted as described above as an initial setting, and the stored attenuation amount to be shifted is determined by the operation of the set switch 16 mh.
The signal 11 read from iC is transferred to the arithmetic unit 20, but it is also output to the switch 21.

The arithmetic unit 20 subtracts the output level amount data set by the level setter 12 and the attenuation amount data transferred from the storage device 19 and to be shifted, and sends the result to the variable attenuator 11. It is output to the attenuator 11 as output level amount V data.

Based on the operation of the set switch 16v, the switch 21 displays the attenuation amount to be shifted read from the storage device 19 when the set switch 16 is pressed and F is connected as described above. 22, and when the set switch 16 is not activated, D and E are connected and serve to display the standard signal υ output level if output from the variable attenuator 11.

As explained above, the display 22 indicates the output level amount for the variable attenuator 11, that is, the standard (
, 4 and the amount of attenuation to be shifted, that is, the amount of step attenuation.

The input key 23 and the level setting dial 13 are input devices for setting the output level of the standard signal outputted to the output terminal to any desired value.

The adder 20 adds and holds the output levels f of the level setting dial 13 and the input key 23.

The operation of the output level shift circuit V of the present invention thus constructed is as follows. That is, first, the reset switch 17 is activated to cut off the switches 150A and 150B. With the level setting dial 13, for example -
30 [dBm: 1k setting. Level setting dial 1
-30 [dBm, :l ii level encoder 14 sets the level encoder 14, and adder 24 outputs the
It is input to a2o. Note that the same effect can be obtained even if the above-mentioned -30 (dBm) is set using the input key -23. Arithmetic unit 20
sets the variable attenuation 15111c to -30 (dBm). The variable attenuation 411 is controlled by kneading, and the standard signal (i) is outputted to the output terminal by -30 (dBm). At this time, the indicator 22i'i: is the variable attenuator 11.
The above-mentioned -30 (dBm) set to is displayed. On the other hand, the amount of attenuation to be shifted using the shift data input key 18, for example 3 (aB) 5, is stored in advance in the storage device 19Vc as an initial setting.

When you press the set switch 16 to activate it, it switches to H? r
15 C/) A and B are connected. Data of attenuation -13 (dB) to be shifted from the storage device 16 by the activation of the set switch 16C/) is read out 19;
The data is transferred to the encoder 20. In the X-enabler 20, the output level amount -30 [dBm] data that has already been input and the attenuation amount 3 (dB) v data to be shifted that has been read out from the storage device 19 and transferred are reduced. Mushroom n5, -
(30-3) = -27CdBml is sent to the variable attenuator 11 as new output level data. Therefore, the variable attenuator 11 is controlled by the new output level t1-27(:dBm)v data set to the variable attenuator 11VC, and the output terminal is -27 from the variable attenuator 11 to the output terminal. A standard signal attenuated to an output level of (dBm) is output. Note that the display 22 is switched while the set switch 16 is pressed. When D and F of 521 are connected, 3 (dB) of the attenuation to be shifted is read out from the storage device 19 at υ, but when the reset switch 16 is released, Switching 2 and 21vD and E are connected, and an output level of -27 (dBm:l'?) is displayed on standard 4 which is output to the output terminal.

Next, when the reset switch 17 is activated, the output level amount -30' (d) held in the adder 20 is set using the level setting dial 13 or the input key 23.
Bm) data is input to the arithmetic unit 2o. On the other hand, since the attenuation amount 3 (dB) to be shifted from the storage device 19 is blocked by the switch 15, the amount of attenuation required is $1. The output level from the level setting type 12 is fit -30[:dBm
: is output to the variable attenuator 11. variable attenuator 1
1 will be controlled by the data of this output and the amount of -30 (dBm), and the output terminal will have -30 (dBm).
m) A standard signal that has been attenuated again to v output level is output, and -30 (dBm) is displayed on the display 22VC. Then, by actuating the reset switch 16, the standard Ig signal whose output level has been shifted by a reduced attenuation Stella of 1 again by 3 (dB:) is output.

In the above explanation, when the shift is n, the power attenuation is 3 [:dB
:] As explained in the example, for example, 0.4 (dB) or 11
The output level can be shifted in non-decimal attenuation steps, such as [dB]. This can be arbitrarily selected by storing it in advance in the storage device 19 as an initial setting using the shift data input key 18.

As explained above, according to the present invention, it is possible to output the measuring standard signal Q with one operation, that is, with one touch, and shift the four signals in steps of a desired level amount. Moreover, since the step i/i shift data input key 18 for the desired level view can be arbitrarily set, it is possible to shorten the measurement time when measuring the two-signal characteristics of the receiver.

[Brief explanation of drawings]

FIG. 1 is a connection diagram for measuring two-signal characteristics, and FIG. 2 shows the configuration of an embodiment of an output level shift circuit according to the present invention. In the figure, 11 is a variable attenuator, and 12 is a level setting H certificate. 13 is a level setting dial, 14 is a level encoder,
15 is a switch, 16 is a set switch, 17 is a reset switch, 18 is a shift data input key, 119 is a storage device, 20 is an arithmetic unit, 21 is a switch, 22 is a display? C 2
3 represents an input key, and 124 represents an adder. Special W [Applicant: Anzu Electric Co., Ltd.

Claims (1)

[Claims] A standard signal generator includes a variable attenuator that attenuates a standard signal, a level setter that specifies an output level, and an arbitrary output level of the standard signal that is outputted to an output terminal by operating the level setter, the standard signal generator including: Set with the output level setter 1
．． a shift data input key for inputting an attenuation signal to shift the output level amount ' by a desired υ level;
a storage device that stores in advance the attenuated scene signal inputted by the shift data input key; , a computing device that outputs the difference to the variable attenuation 84; a switching device provided between the computing device and the above device; and a set switch that turns on the switching device; When the set switch is operated 1.
An output level shift circuit characterized in that the standard signal υ output level outputted to an output terminal t15 is shifted by a desired υ level amount.