JPS60189318A - Pulse amplifying device - Google Patents

Abstract

PURPOSE:To reduce a power loss of an amplifier, and to make a radiator small in size by providing a controlling circuit for controlling to apply a voltage from a power source to an amplifying element by synchronizing with an input signal. CONSTITUTION:When an input pulse signal is impressed to an input end 1, a synchronizing pulse synchronized with the input pulse signal is also generated, therefore, a transistor TR12 becomes a conducting state, a current flows through a relay power source 10, a relay coil 9b, the TR12 and a ground, the coil 9b is energized, and a relay contact 9a is closed. As a result, power is impressed to an amplifying element 2 from a main power source 5, and the input pulse signal is amplified by the amplifying element 2 and outputted from an output end 8 as an output pulse signal through a DC stopping capacitor 7.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a pulse amplification device.

[Prior art]

Figure 1 shows a conventional pulse amplification device.
2) Ne - Connect the gate electrode to this input terminal.

The amplification element t (3a) (3b) consists of a field effect transistor whose one main electrode is grounded, and the bias power supply +4
A pair of bias resistors are connected in series between the 10 potentials of ) and the ground, and their connection point is connected to the gate electrode of the amplifying element (2) to apply a bias potential to the gate electrode. (5) is a main power supply; (6) is a filter for the main power supply connected between the ten potentials of this main power supply and the other live electrode of the amplification element (2);
a) and a capacitor (Sb). (7) is a DC blocking capacitor connected between the other live electrode of the amplifying element (2) and the output terminal (8).

In the pulse amplification device configured in this way.

When an input pulse signal is input to the input terminal (11), it is amplified by the amplifying element 121K and outputted as an output pulse signal from the output terminal (8) via the DC blocking capacitor (7). It is something that will be done.

However, when a pulse amplifying device configured in this manner is used in an amplification format such as 1'-A class or AB class, it is necessary to constantly flow a large bias current. A main power source (51) with a large capacity is required, and the power loss of the amplifying element (2) becomes large, resulting in a problem that a large heat sink is required.

[Summary of the invention]

The present invention has been made in view of the above-mentioned points, and includes an open side j means for opening the application of power from the power supply to the amplifying element in synchronization with the input pulse signal.

The present invention proposes a pulse amplifying device in which power is applied from a power source to an amplifying element when an input pulse signal is input, thereby reducing the current capacity of the power source and downsizing the VC heat sink.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on FIG. 2. In FIG. 1, (9) is a relay consisting of a relay contact (ri) and a relay coil (9b).
When b) is excited, the relay contact (9I!L) is closed, and the above relay contact (%) is the raw cloth 1 source (5)
, and the main power filter (6), and one end of the relay coil (9b) is connected to the + potential of the relay power source OI. 0υ is a synchronous pulse input terminal into which a synchronous pulse signal synchronized with the input pulse signal is input, (1z is a pace connected to this synchronous pulse input terminal, and a collector is connected to the above relay coil (9b)
Connected to the other end is a transistor whose emitter is grounded, and becomes conductive when the synchronization pulse signal is input to the pace.

Note that the relay (9) and transistor a2 apply the same voltage to the input pulse signal to the amplifier element (2) from the main power source (5).
).The input pulse signal and the synchronous pulse signal have a waveform as shown in FIG. 3←Xb).
As a means for generating this, for example, a synchronous pulse signal may be generated by a computer, and a pulse generator that generates an input pulse signal may be triggered by the synchronous pulse signal, in this case.

It is preferable that the pulse width of the synchronization pulse signal is not smaller than the pulse width of the input pulse signal.

Next, the operation of the pulse amplifying device constructed in this manner will be explained.

First, when the input pulse signal is not applied to the input terminal (11), a synchronous pulse signal synchronized with the input pulse signal is not generated, so the transistor Qz is non-conducting.
The relay coil (9b) of the relay (9) is not excited, and the relay contact (9a) is in an open state. As a result, no power is applied to the amplification element (2) K from the main power supply (5), and there is no power loss in the amplification element +21K. When the input pulse signal is applied to the input terminal (1), a synchronous pulse signal synchronized with the input pulse signal is also generated, so the transistor a2 is not in a conductive state and the relay terminal 01
Current flows between - relay coil (9b) - transistor α2 - ground, the relay coil (9b) is excited, and the relay contact (%) is closed. As a result, no power is applied to the amplifier element (2) from the main power supply (5), and the input pulse signal is amplified by the amplifier element (2) and passed through the DC blocking capacitor (7). This signal is output from the output terminal (8) as an output pulse signal.

Therefore, in this pulse amplifying device, the amplifying element (2) is activated only when the input pulse signal is applied to the input terminal (1).
Since the voltage of the main power supply (5) is applied to the main power supply (5), there is no need for the main power supply (5) to have a large capacity.

(5) Moreover, the frost and power loss of the amplifying element (2) are reduced.

The heat sink can also be made smaller, and the overall size can be reduced.

In addition, in the above embodiment, a field effect transistor was used as the amplification element (2), but
The present invention is not limited to this, and similar effects can be achieved even with vacuum tubes, commonly used transistors, and the like.

Furthermore, in the above embodiment, the control means was composed of the relay (9) and the transistor 0'3; however,
An analog switch or the like may be used instead of the relay (9), and the key is to supply power from the main power supply (5) to the amplifier element (2) when a synchronized pulse signal synchronized with the input pulse signal is input. The same effect can be achieved if the method is used.

Furthermore, this pulse amplification device is Class A.

It can be applied not only to AB class but also to B class amplification type.

〔Effect of the invention〕

As described above, this invention has a pulse-like input, 0(6
) In a pulse amplification device in which a signal is amplified by an amplification element, a control means is provided to control the application of voltage from the power supply to the amplification element in synchronization with the input signal, so that the amplification is performed when the input signal is present. Since the voltage from the power source is applied to the element, the current capacity of the power source can be reduced, and the power loss of the amplifying element is small, making it possible to significantly reduce the size of the heat sink.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional pulse amplification device. FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is a time characteristic diagram showing an input pulse signal and a synchronizing pulse signal. In the figure, (1) is the input terminal, (2) is the amplification element, and (5)
is the main power supply, (8) is the output terminal, (9) is the relay of the control means, (lυ is the synchronous pulse input terminal, (+2 is the transistor of the control means. In addition, the same symbols in each figure are the same - or equivalent Parts are shown. Agent Masuo Oiwa (and 2 others) (1)

Claims (1)

[Claims] In a device having an amplifying element that receives a pulsed input signal, amplifies the input signal, and outputs the amplified signal, and a power source that applies a voltage to the amplifying element, the input signal from the power source to the amplifying element is synchronized with the input signal. A pulse amplification device equipped with one open side means for controlling the application of voltage.