JPS60182817A - I2l circuit - Google Patents

Abstract

PURPOSE:To set easily a desired output signal amplitude and an output operating level suitable for high frequency signal processing by providing a differential amplifier circuit as an output circuit of an I<2>L circuit. CONSTITUTION:When a level of an input 3 is at H, transistors (TR) Q5 and Q7 are turned on/off respectively, a base current is applied from an injector current supply TRQ8 to a TRQ9 of a differential amplifier circuit 11, the TRQ9 is turned on and an output 5 goes to H. A potential of nearly (V1-V2)/2 obtained by dividing a potential difference between a potential V1 at a common injector terminal and a potential V2 at a common emitter terminal with resistors is impressed to the differential amplifier 11 as a reference potential and an output signal amplified to a desired amplitude is obtained by setting properly the values of a power supply voltage, a resistor R5 and a constant current source CS. Since the reference potential at the interface is set optionally by setting values of resistors R3, R4, an output of the I<2>L circuit 6 is inputted directly to an output circuit comprising the differential amplifier 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an IL semiconductor circuit, and particularly to an output circuit that extracts the output thereof.

[Prior art]

I''L When extracting the output signal of a semiconductor circuit and transmitting it to a signal processing circuit etc. composed of different elements, IL is used.
The output is taken out from the semiconductor circuit via the interface circuit and applied to the next stage signal processing circuit.

Figure 1 shows a conventional example of an IL circuit equipped with an interface circuit, and is composed of transistors Ql and Q2.
The collector of the transistor Q2, which is the output terminal of the Ushinagi body circuit 6, is connected to the deaf source voltage terminal 1 through the resistor hole l, and the emitter is connected to the grounded transistor Q3. The collector of the transistor Q3 is connected to the power supply terminal 1 via the resistor R2, and is also connected to the output terminal 5.

In FIG. 1 of the conventional circuit example, the input terminal 3 is
# When level, injector current supply transistor Q
A current is supplied from l to the base of the transistor Qz, and the transistor Q2 becomes saturated, the potential of the transistor Q3 becomes the saturated physical pressure of the transistor Q2, and the transistor Q3 goes into an interrupted state. Therefore, the potential of the output terminal 5 connected to the collector of the transistor Q8 rises to the potential of the 11 source voltage terminal 1. Input terminal 3 is “L”
” level and injector current supply transistor Q
When the current from l flows into the transistor Q2, the transistor Q2 becomes in an interrupted state, and current is supplied to the base of the transistor Q3 from the power supply voltage terminal 1 through the resistor R1, and the transistor Q3 is in the saturated state, and the potential of the output terminal 5 is reduced. falls to the saturation voltage of transistor Q3.

As described above, in response to changes in the output signal amplitude of the IL semiconductor circuit, a signal is outputted to the output terminal 5 as a signal that takes two values: the potential of the power supply to voltage terminal 1 and the saturation voltage of the transistor Q3.

However, in the above conventional circuit example, when the transistor QB is saturated, a delay occurs in the rise of the collector due to the accumulation time of the transistor, and the output signal cannot follow particularly high frequency input signals, resulting in a left-handed waveform. occurs, and the frequency range in which signals can be transmitted to the next stage signal processing circuit is extremely limited.

Furthermore, the signal amplitude that can be output to the output terminal 5 is determined by the resistance R2
However, since the current that can be passed through transistor Q2 is limited by the injector current that flows through injector current supply transistor Q1 of IL semiconductor circuit 6, the output signal amplitude Also, the desired output signal amplitude and output operation level cannot be obtained because the injector current is limited.

As a means to improve this problem, there is a method of increasing the potential of the power supply voltage terminal 1 and increasing the load resistance R2. However, in this case, as the load resistance kL2 becomes larger, the time constant obtained by the product of the stray capacitance and the resistance R2 at the output terminal 5 becomes larger, which is not suitable for high frequency signal transmission.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an IL circuit that is suitable for high frequency signal processing and that is equipped with an output circuit that allows a desired output signal amplitude output operation level to be easily set.

[Structure of the invention]

According to the present invention, a voltage is applied between the common injector terminal and the common emitter terminal via the first resistor and the second resistor, respectively, and the injector is connected to the output terminal.
L: A semiconductor circuit, and a differential amplifier in which one input terminal is connected to the output terminal, and the voltage generated by dividing the voltage difference between the common inject terminal and the common emitter terminal is immediately applied to the other input terminal. An IL circuit is obtained which increases the output of the I''L semiconductor circuit by connecting the output terminal of the differential amplifier circuit to the output terminal of the differential amplifier circuit.

[Example]゛ Next, the present invention will be specifically described with reference to the drawings.

FIG. 2 shows an example of an implementation circuit of an LL circuit which is an extension of the output circuit according to the present invention. In FIG. 2, a differential amplifier circuit 11 comprising two differential input terminals 9 and 10 and an output terminal 5
is composed of transistors pQ., Qzo, a load resistance cell, and a constant current source C8.

Transition: x, p Q4 +QS, Qe pQ' +
The common injector terminal 2 of the 12L semiconductor circuit 6 having a Q" parallel configuration is connected to the % source voltage terminal 1 through a resistor 'EL3, and a voltage is applied thereto. The common emitter terminal 7 is connected to the ground terminal 8 through a resistor R4. The collector of the transistor Q7, to which the collector of the injector current supply transistor Q8 is connected, is connected to one input terminal 9 of the differential amplifier circuit 11. The collector of the transistor Q7 is connected to the collector of the injector current supply transistor Q8. is connected to the common injector terminal 2 via a resistor R6, and to the common emitter terminal 7 via a resistor R7.

When the input terminal 3 enters the input state of ``H'' level with reference to the 1' position of the common emitter terminal 7, the transistor Q,
becomes saturated, and the collector of transistor Qs has
The injector current is supplied to the injector current supply transistor pQs, and the pace potential of the transistor Q7 is
The potential of the common emitter terminal 7 rises to a voltage equal to the saturation voltage of the transistor Q+, and the transistor Q7 is placed in an interrupted state. Therefore, a current is supplied from the injector current supply transistor Qa to the input terminal 9 of the differential amplifier circuit 11, and the input terminal 9 attains the 6H# level state.

Next, when the input terminal 3 reaches an input state of 6L'' level with reference to the potential of the common emitter terminal 7, the transistor Qs
Then, the injector is in an interrupted state and the injector current is supplied from the transistor Q6 to the base of the transistor Q7! #
is supplied, and the transistor Q7 becomes saturated. Therefore, the injector current is supplied from the injector current supply transistor Q8 to the collector of the transistor Q7,
The input terminal 9 of the differential/amplifier circuit 11 becomes ``'L# level state.

On the other hand, in the differential amplifier circuit 11, one input terminal 1
0, the potential difference between the common injector terminal potential vl and the common emitter terminal potential 2 is resistor Ra.

Obtained by dividing with R7. A selected reference potential is applied to tl (Vl - V2)/2, and the other input terminal 9
The above-mentioned 2.
A signal having a value of IT H#, "'L" is input. Therefore, the input terminal 3 of the IL semiconductor circuit 6 is H","L
In response to the input signal at the # level, the output terminal 5 of the differential amplifier circuit 11 outputs an output signal at the #)"H#, *I, # state. Here, the differential amplifier circuit 11 outputs an output signal at the # level input signal. With respect to the power supply voltage, the resistance Rs.

By arbitrarily setting the value of the constant current source C8, an arbitrary gain can be obtained and an output signal amplified to a desired output amplitude can be obtained. Furthermore, by arbitrarily setting the resistances of resistors R3 and R4 connected to the common injector terminal 2 and common emitter terminal 7 of the IL semiconductor circuit 6, the potential of the common emitter terminal 7, that is, the difference from the fabricated semiconductor circuit 6. The reference potential at the interface with the signal processing circuit, such as the dynamic amplifier circuit 11, can be arbitrarily selected. Therefore, it is possible to directly input the output signal of the IL semiconductor circuit 6 to the signal processing circuit, and
"L" There is no need for a level shift circuit using a resistor or the like at the interface between the semiconductor circuit and the signal processing circuit, and furthermore, the input transistor of the signal processing circuit is not saturated, so the frequency characteristics in the high range are greatly improved.

As described above, according to the present invention, it is possible to provide an IL circuit that is suitable for high-frequency signal processing and in which the signal output amplitude and signal output reference level can be arbitrarily set.

However, the present invention is limited to the above-described embodiment, and the circuit configuration shown in FIG. 2 in particular may be modified as appropriate within the scope of the present invention.

[Brief explanation of drawings]

Figure 1 shows a conventional example of an IL circuit equipped with an interface circuit! l? FIG. 2 is a circuit diagram illustrating an embodiment of an IL circuit including an interface circuit according to the present invention. 1...Power snow pressure terminal, 2...Common injector terminal, 3...Input terminal, 4,7...
...Common emitter terminal, 5...Output terminal, 6
・・・・・・IL Semiconductor circuit, 8... Ground terminal, 9.10... Differential circuit input terminal, 11...
...Differential amplifier circuit, Ql, Q* +Qs lQ4
1Q61Qs+Qt, Ql1lQ91QIO...
・Transistor, R1゜Rz, R8, R14, R5,
R6, ELr----Resistance, cs, ,, ,,,,
Constant current source.

Claims (1)

[Claims] A current is supplied from the injector transistor to the base of the output transistor, an input signal is applied to the base of the output transistor, an output signal is taken from the collector of the output transistor, and the output transistor is connected to the collector of the output transistor by another injector transistor. and a differential amplifier circuit having one input terminal connected to the collector of the output transistor and having a bias voltage applied to the other input terminal, An IL circuit characterized by increasing the output from the output terminal of the dynamic tsubo/width circuit.