JPS589383Y2 - pulse amplification circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulse amplification circuit, and more particularly to a pulse amplification circuit with sag correction useful for radar transmitters.

Conventionally, this type of pulse amplification circuit has adopted a circuit configuration as shown in FIG. 1, and when a plurality of continuous pulses ein (see FIG. 2a) are amplified, the output voltage e is generated through a transformer T.

When g occurs, a sag occurs due to the magnetic characteristics of the transformer T itself, and the output voltage e.

g decreases with time (see FIG. 2), and the current icg flowing through the grid of the vacuum tube v2 also decreases, as shown in FIG. 2C.

An object of the present invention is to provide a pulse amplification circuit that makes it possible to correct the drop in output level due to the sag.

In order to achieve this object, the pulse amplification circuit according to the present invention combines a parallel circuit in which a capacitor and a resistor are connected in parallel, and a series circuit in which a diode is connected in series in a transformer-coupled pulse amplification circuit. It is characterized by being connected in parallel to the next side.

Next, an embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 3, which shows an example of the circuit of the present invention, the transformer T
One terminal of the resistor R1 is connected between the secondary side of the V2 and the grid of the vacuum tube V2, and the anode of the diode D is connected to the other terminal.

A capacitor C1 and a resistor R2 are connected to the cathode of the diode D.
A parallel circuit is connected, and another terminal of this parallel circuit is connected to another terminal on the secondary side of the transformer T.

Next, the operation of each section in FIG. 3 will be explained with reference to FIG. 4, which shows a time chart of signals of each section.

A plurality of pulse trains ein shown in FIG. 4a are manually applied to the grid of vacuum tube v1 in FIG.

In the conventional example, the output level on the secondary side of the transformer T decreases as the pulses become later, as shown in Figure 2, due to the sag characteristics of the transformer, but in the sag correction circuit according to the present invention, Secondary current ic of transformer T
flows and charges the capacitor C1, so that the potential 8c at one end of the capacitor C1 rises (see Figure 4), and the secondary current i flows at the first pulse.

The secondary current ic flowing in the second pulse decreases more than that in the second pulse, and as shown in ic shown in FIG. 4C, the current decreases as the pulse progresses.

In other words, since the load on the secondary side of the transformer T becomes lighter as the pulse progresses, the output pulse ec gradually decreases as shown in Fig. 4d.
The amplitude of g increases, and the peak voltage and pulse width of the pulse can be kept almost constant.

Therefore, the grid current icg can also be made constant as icg shown in FIG. 4e.

Note that the diode D in the figure is used to prevent the charge charged in the capacitor C1 from flowing back to the resistor R1, and the resistor R2 is a resistor used to discharge the charge charged in the capacitor C0 before the next pulse train arrives. be.

As explained above, the present invention configures the circuit shown in FIG. 3, and by appropriately selecting the constants of resistors R1 and R2 and capacitor C1, it is possible to eliminate sag in the pulse amplification circuit due to transformer coupling. A transmitter using the modulator according to the present invention can transmit a constant-level pulse train signal with sag removed.

[Brief explanation of the drawing]

Fig. 1 is a conventional pulse amplification circuit, Fig. 2 is an operating waveform diagram of each part in Fig. 1, Fig. 3 is a pulse amplification circuit diagram according to the present invention, and Fig. 4 is an operating waveform diagram of each part in Fig. 3. be.

Claims (1)

[Scope of utility model registration request] A pulse amplification circuit using transformer coupling, characterized in that a parallel circuit in which a capacitor and a resistor are connected in parallel, and a series circuit in which a diode and a resistor are connected in series are connected in parallel to the secondary side of the transformer. Amplification circuit.