JPH03179906A - Temperature compensation type gain setting controller - Google Patents

Abstract

PURPOSE:To reduce power consumption and to improve the efficiency of a repeater by limiting the energizing time of a ROM only when a power source is applied, or a pulse command is received, or temperature status is changed, and incorporating an oscillator to latch the output of the ROM and to operate a latch circuit. CONSTITUTION:When a tele-command signal transmitted from the outside is applied to an input terminal 1, the content of a gain status decoder 2 is updated, and the output of the decoder is outputted as the address of the ROM 3. The output of an A/D converter 7 is applied to the ROM independently from that of the gain status decoder. The input of the A/D converter is set at the potential of the connecting point of a resistor 8 to a thermistor 9. The output of the A/D converter is applied to a latch-1, 13, an AND gate-1, 14, and a NOR gate 15 by the share of LSB other than a ROM address. The latch-1 fetches the LSB of the A/D converter at every clock cycle generated by the oscillator 16, and outputs it to the AND gate 1 and the NOR gate.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for varying the gain of a satellite-mounted repeater (hereinafter referred to as a repeater) consisting of a microwave circuit, for example, in fixed steps by an external command. The present invention also relates to a gain control device that compensates for gain displacement due to temperature fluctuations.

[Prior Art] Conventionally, there has been a device of this type as shown in the block diagram of FIG. (1) is a telecommand signal input terminal,
(2) is a gain status decoder.

(3) is a ROM, and (4) is a power-on reset circuit.

(5) is a telemetry signal 1° (6) that instructs to increase the gain.
is the telemetry signal 2° (7) that instructs the profit margin to decrease.
D converter, (8) is a resistor, (9) is a thermistor,
(10) is a D/A converter, (11) is a variable attenuator bias, and (12) is an output terminal. FIG. 3 shows the positioning of the gain control device in the repeater. (
30) is a temperature compensated gain setting control device.

(40) indicates the RF band width device 1 (50) and the RF band width device 2 (60) indicate variable attenuators.

Next, the operation will be explained. When a telecommand signal transmitted from the outside is applied to the input terminal (1), the contents of the gain status decoder (2) are updated, and its output is output as the address of ROM (31). After being reset by a pulse generated by a power-on reset (4) when the power is turned on, the gain increase telecommand signal 1 (51) receives a gain decrease telecommand signal 2 (6) and decodes the set gain.

The output of the A/D converter (7), which is completely independent of the output of the gain status decoder, is applied to the ROM. A
The input of the /D converter is a resistor (8) and a thermistor (
9) is the potential at the connection point. When the resistance value of the thermistor changes due to temperature fluctuation and the amount of change in the connection point potential exceeds a threshold value of the A/D converter, the output of the A/D converter also changes.

The bias value of the variable attenuator that can achieve the set gain under one ambient temperature condition by changing the attenuation amount of the variable attenuator is written in the FIOM, and the ROM
The output is converted into an analog voltage by a D/A converter (10) to obtain a variable attenuator bias [11] and supplied to an output terminal (12).

[Problem to be solved by the invention 1 Since the conventional temperature-compensated gain control device is configured as described above, the energization time of the ROM in one device must be the same as the energization time of the entire repeater. , steady ROM
It is necessary to apply a voltage to the relay, which increases the power consumption of the entire repeater and reduces its efficiency.

This invention was made to solve the above-mentioned problems, and provides a temperature compensated gain control device that can reduce the power supply time to the ROM, reduce the power consumption of the repeater as a whole, and increase the efficiency of the repeater. The purpose is to obtain.

[Means to solve the problem] A temperature compensated gain control device according to the present invention.

The ROM is equipped with a built-in oscillator that limits the power supply time to the ROM when the power is turned on, when a pulse command is received, and when the temperature status changes, and also includes an oscillator that latches the ROM output and operates the latch circuit.

[For Use] The temperature compensated gain setting control device according to the present invention can improve repeater efficiency by reducing the average power consumption of the ROM, which is dominant in power consumption.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. In Figure 1, (1), (2), (3),
f4).

(5), (6), (7), (8)
, [9), (lo), (11).

(12) is exactly the same as the conventional device. (13)
is latch circuit 1. (14) is AND game 1-1. (15
) is the NOR gate, (16) is the oscillator, (17) ~
(19) is the OR gate l, 2, 3 . (20) is a switching transistor, (21) is a latch circuit 2. (22
) indicates an ANDNO gate. The positioning of this device in the repeater is also exactly the same as the conventional one (Fig. 3).

Next, the operation will be explained. When a telecommand signal transmitted from the outside is applied to the input terminal (1), the contents of the gain status decoder (2) are updated, and its output is output as the address of the ROM (3). After the gain status decoder is reset by a pulse generated by the power-on reset (4) when the power is turned on, it receives telecommand signal 1 (5) for increasing the gain and telecommand signal 2 (6) for decreasing the gain. Decoding set gains.

The output of the A/D converter (7), which is completely independent of the output of the gain status decoder, is applied to the ROM. A/
The input of the Dj inverter is a resistor (8) and a thermistor (9).
) is the potential at the connection point. When the resistance value of the thermistor changes with temperature fluctuations and the amount of fluctuation in the connection point potential exceeds the threshold value of the A/D converter, the output of the A/D converter also changes.

In addition to the ROM address, the output of the A/D converter is also applied to the latch l (131, ANDNO gate (14) and NOR gate (15). Latch 1
Then, the LSB of the A/D converter is captured every clock cycle generated by the 9 oscillator (16).

AND gate 1. Output to NOR gate.

AND gate 1 and NOR gate sample the temperature situation with a clock, and the L
When the change of SH was chanted.

The temperature change status is output through OR gate 1 f171. On the other hand, also for pulse command signals.

If one of the two commands is sent, O
It signals the status of the gain change through R gate 2 (18). In addition, the bias value of the variable attenuator that can realize the set gain under two ambient temperature conditions by changing the attenuation amount of the variable attenuator is written only when the power-on reset pulse generated at power-on is enabled. OR so that voltage is applied to the ROM
The output of gate 3 (19) is connected to a switching transistor (
20), the transistor is turned on and no current flows to the ROM.

Note that this state lasts only for the clock cycle, so latch 2 (21) is set to 2 to prevent the ROM output from disappearing.
It is retained until the next gain change. At the next gain change, A
The ROM output is taken in again by the pulse obtained from ND gate 2 (221). The setting gain data held in latch 2 is converted to an analog voltage by the D/A converter (1O) and is applied to the terminal (12) as a variable attenuator bias.
) is output.

[Effects of the Invention] As described above, according to the present invention, since the ROM is operated for one clock period when changing the gain, a temperature-compensated gain setting device with low power consumption can be obtained, and the efficiency of the repeater can be improved. It has the effect of improving

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a temperature compensated gain setting control device according to an embodiment of the present invention, FIG. 2 is a conventional system, and FIG.
The figure shows the positioning in the repeater of Figure 1.2. (1) is a telecommand input terminal, (2) is a gain status decoder, (3) is a ROM, (4) is a power-on reset circuit, (5) and (6) are telecommand signals, and (7) is an A/ D converter, (8) is a resistor. (9) is the thermistor, (10) is the D/A converter. (11) is the variable attenuator bias, (12) is the output terminal, and (13) is the latch circuit 1. (14) is AN
D gate (9) 1, (15) is NOR gate 1-, (16) is oscillator,
(17). (18), f19) is OR gate 1. 2. 3.
[20] indicates a switching transistor, (211 indicates a latch circuit 2, and (22) indicates an AND gate 2. In Figure 1, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] a gain status decoder having an input terminal into which a first telecommand pulse indicating a gain increase and a second telecommand pulse indicating a gain decrease is input, and decoding a set gain state from the input command signal; and a gain status decoder between the power supply and ground. a resistor and a thermistor connected in series, an A/D converter that captures the potential at the connection point between the resistor and thermistor, a power-on reset circuit, an oscillator that generates a clock, and a clock cycle of the oscillator. a first latch circuit that holds the least significant bit of the A/D converter; a first AND gate that inputs the least significant bit of the A/D converter and the output of the first latch circuit; and a NOR gate;
a first OR gate that inputs the outputs of the first AND gate and the NOR gate, a second OR gate that inputs the first and second telecommand pulses, and the power-on reset circuit. a third OR gate inputting the output, the output of the first OR gate, and the output of the second OR gate; a transistor whose base is connected to the third OR gate; and a voltage is applied through the transistor. a ROM that reads out a voltage value required to obtain an attenuation amount of the attenuator corresponding to a gain setting value adapted to the ambient temperature condition, using the parallel output signals of the gain status decoder and the A/D converter as an address; , a second AN inputting the clock of the oscillator and the third OR gate;
D gate and the above ROM output, and the above second AN
A second latch circuit that holds the ROM output by the output of the D gate, a D/A converter that converts the output of the second latch circuit into an analog value, and an analog value passing through the output of this D/A converter. 1. A temperature compensated gain setting control device comprising: an output terminal for supplying a signal to a variable attenuator capable of controlling loss.