JPS5912620A - Pulse amplifier circuit - Google Patents

Abstract

PURPOSE:To improve the leading response characteristic of an output voltage waveform without incurring the increase in power consumption, by providing a switching element in parallel with a bias supply resistive element. CONSTITUTION:A transistor TRQs being the switching element is connected in parallel with a bias supply resistive element RB. The base of the TRQs is connected to a signal input terminal 3 via a resistor Rs and a capacitor Cs. Further, the TRQs is controlled to on-state an input signal switching a TRQ1 from OFF to ON is changed. As a result, since the TRQ1 is rapidly switched to ON, the leading response characteristic of an output voltae V0 is made steep without decreasing the value of the resistive element RB. Thus, the leading response characteristic of the output voltage waveform is improved without incurring the increase in power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to a pulse amplification circuit, and particularly to a pulse amplification circuit for driving a display device such as a gas discharge display panel or an electroluminescence display panel, that is, a capacitive amplifier. This relates to the high voltage pulse intensifier 1111+1 circuit.

(b) Prior art and key points FIG. 1 is a diagram showing an example of the configuration of a pulse amplification circuit used to drive the above-mentioned display device. In the figure, Ql and Q2 are transistors that serve as switching elements, and these transistors Qs and Q2 are '
It is connected in series between the solder source terminals 1 and 2 via a diode D. The human power electrode, or base, of the transistor Q2 is connected to the signal input terminal BKt&, and the human power electrode, or pace, of the transistor Q1 is connected to the collector, which is the output 'gt pole, of the transistor Q2, and is connected to the bias supply resistor element Chill □. Connected to terminal 4. Although not shown, a bias power supply is connected to this terminal 4, and a voltage element va2 is applied thereto. Further, the emitter of the transistor Q1 is connected to an output terminal 5, and a capacitive negative electrode CL is connected to the output terminal 5.

Further, a voltage element Va1 is applied to the terminal l. In such a configuration, the human input signal voltage shown in FIG. 2 Vi is input to the signal input terminal 8. Now, the human power signal voltage Vi is at timing 1. When switching from Ov to 1H level at , transistor Q2 turns on and at the same time transistor Q
s is switched off, and the output voltage ■ as shown in Figure 2 Vo.
0 is OV. The diode D is inserted in order to more reliably turn off the transistor Q1 by utilizing the forward voltage drop that occurs across the diode D when the transistor Q1 is turned off.

Next, at timing t2, when the input signal voltage Vi switches from the 'H level to Ov, the transistor Q2 is turned off and the transistor Q1 is turned on. At this time, since the transistor Q2 has an output capacitance of 00, the bias voltage for the transistor Ql increases according to a time constant determined by the product of the bias supply resistor element B and the output capacitance CG. However, if the value of the bias supply resistance element RB is large, sufficient base current cannot be supplied to the transistor Ql when the transistor Q1 is turned on, and the rising waveform of the output voltage VO becomes dull, resulting in a sharp waveform. It disappears. On the other hand, in order to prevent such rounding of the output voltage waveform, it is possible to reduce the value of the bias supply resistor element B, but in that case, when the transistor Q2 is in the on state, the This has the disadvantage that the reactive current that flows increases, leading to an increase in power consumption.

(C) Purpose of the Invention The present invention has been made in view of the above-mentioned points, and provides a pulse amplification circuit having a configuration that improves the response characteristics of the output and response characteristics without increasing power consumption. The purpose is to provide

(d) Configuration of the Invention The pulse amplification circuit according to the present invention has a pair of switching elements connected in series between two single source terminals, and the input IMi of one switching element is connected to a signal input terminal, and the input IMi of one switching element is connected to a signal input terminal. In a configuration in which an input electrode of a switching element is connected to an output electrode of the one switching element and also connected to a bias power supply via a bias supply resistance element, another switching element is connected in parallel with the bias supply resistance element. The present invention is characterized in that the switching element is controlled to be in the on state at the time of change of the human power signal for turning on the other switching element.

(e) Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

FIG. 8 is a diagram showing an example of the configuration of a pulse amplifying circuit according to the present invention, and the same parts as in FIG. 1 are given the same reference numerals.

As is clear from FIGS. 1 and 8, the difference between the pulse amplifying circuit according to the present invention and the conventional one is that a transistor Qs, which is another switching element, is connected in parallel with the bias supply resistance element RB. The base of Qs is connected to the signal input terminal 8 via a resistor R5 and a capacitor Os. In such a configuration, the human input signal voltage shown in FIG. 4 Vi is input to the signal input terminal 8. Now, when the input signal 'voltage Vi switches from OV to 'H level at timing t1, the transistor Q2 turns on and at the same time the transistor Qr turns off, so that the output voltage VO becomes Ov as shown in FIG. 4 Vo. At this time, the base of the transistor Qs has a timing t1.
A bias voltage corresponding to the time constant determined by the resistor S and the capacitor C8 is applied through the capacitor C3 and the resistor R8, but since this bias voltage acts as a reverse bias on the transistor Qs, the transistor Q2 is maintained in the off state.

Next, at timing t2, the input signal voltage Vi becomes ``H''.
When switching to H Rubelka OV, transistor Q2 turns off and at the same time transistor Q1 turns on. At this time, a bias voltage of 1111 (direction a) corresponding to the time constant determined by the product a, , -aS is applied to the base of the transistor Qs, and the transistor Qs is temporarily turned on. Therefore, the base of the transistor Q1 A base current is supplied through the bias supply resistance element RB and the transistor Qs.That is, at the time when the human power M for switching the transistor Q! from the off state to the on state changes, the transistor Q3 becomes kM. As a result, the transistor Ql suddenly switches to the on state, and the output voltage VO suddenly rises at timing t2.Then, when the output voltage VO reaches +val, the transistor Q is turned on.

is turned off, and thereafter, a base current is supplied to the base of the transistor Qs through the bias supply resistance element BE, and the output voltage VO is maintained at +■a1. Note that the transistor Qs is in an off state when the transistor Ql is in an off state and when the transistor Q2 is in an on state. Thus, the bias supply resistance element R
The rise response characteristic of the output °C pressure VO can be made steeper without reducing the value of B, and as a result, the front edge of the output voltage waveform can be reduced without increasing the The pJ ratio of the accent is 6INF5.0 Next, FIG. 5 is a diagram showing the configuration of another embodiment of the pulse amplification circuit according to the present invention.
Transistors Q1 and Q2 are connected between the terminal 1 and the terminal 1 to which the voltage -Val is applied, and the base of the diode D is connected to the flipter of the transistor Q1, and the bias voltage -VB2 is applied through the bias supply resistor element B. is connected to terminal 4. Further, a transistor Qs is connected in parallel with the bias supply resistive element RB, and the base of the transistor Qs is connected to the signal input terminal 8 via the resistor (2) and the capacitor O5. Furthermore, the base of a transistor Qt is connected to the relay input terminal 8. Further, the emitter of the transistor Q2 is connected to the output terminal 5, and the capacitive load OL is connected to the output terminal 5. In such a configuration, a human power signal %j pressure shown in FIG. 6 v1 is input to the signal input terminal 3. Now, when the human power signal voltage Vi switches from もH' level to 0■ at timing t1, transistor Q+ turns on and at the same time transistor Q2 turns off, and the output voltage VO becomes +VCC as shown in Fig. 6 Vo. Switch. Next, timing t2
When the human input signal voltage Vi switches from Ov to the t■■I level, the transistor Ql turns off and at the same time the transistor Q2 turns on, and the output voltage VO switches from +VCC to -Va1 as shown in VO in Figure 6. Ru. On this occasion,
A base current is temporarily supplied to the base of the transistor Q5 through the capacitor C and IL8 at timing t2 to turn it on, and the bias supply resistor 4 is turned on.
5°C IgB becomes short-circuited and transistor Q
2 will be suddenly supplied with base current. At this time, the transistor Qs is turned off when the output voltage VO reaches -Val due to the transistor Q2 being the main element.
After that, the base current is supplied to the transistor Q2 through the bias supply resistor ILp, and the output voltage Vo becomes -
Maintain val. In other words, the transistor Qs is turned on at the time of change (timing tz) of the human input signal for turning on the transistor Q2. As a result, even if the value of the bias supply resistor element B is not reduced, the output voltage VO
The response characteristic at timing t2 becomes steep, making it possible to prevent the leading edge of the output voltage waveform from becoming rounded without increasing power consumption in the circuit.

In the above embodiment, the switching elements Q+, Qz, and Qst-" were constructed with one bipolar transistor, but the switching element can be constructed not only with one bipolar transistor but also with a combination of multiple transistors. It is of course possible to use other switching elements other than bipolar transistors, such as field effect transistors and thyristors.Furthermore, the present invention is limited to providing the power supply terminal 1 and the bias power supply terminal 4 separately. Of course, it is also possible to commonly connect the terminals to one of the terminals and use a common power source.

(f) Explanatory power that exceeds the effects of the invention> As is clear from the above, according to the present invention, a sharp output pulse vehicle pressure waveform can be obtained without causing an increase in the dissipating force in the circuit.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of a conventional pulse amplification circuit, Fig. 2 is a diagram showing the input voltage waveform and output voltage waveform in Fig. 1, and Fig. 3v is a diagram showing an example configuration of the pulse amplification circuit according to the present invention. , FIG. 4 is a diagram showing the input terminal waveform and output voltage waveform in FIG. 5 is a diagram showing the input terminal waveform and output voltage waveform in FIG. 5. FIG. In the figure, l and 2 are electric 111! Terminals, 3 is a signal input terminal, 4 is a bias (mental image) terminal, 5 is an output terminal, Q
+1Q2 and Q3 are switching elements, and B is a bias supply resistance element, respectively. Figure 1 Figure 3 Figure 2 Figure 41η; 1 t+ t2 Figure 5 Figure 6 j+ t2

Claims (1)

[Claims] A configuration in which a pair of switching elements are connected in series between two power supply terminals, an input electrode of one switching element is connected to a signal input terminal, and an input electrode of the other switching element is switched to the one of the switching elements. , characterized in that another switching element is provided in parallel with the bias supply resistor element, and the switching element is controlled to be in an on state at the time of change of a human power signal for turning on the other switching element. pulse amplification circuit.