JPS60127806A - Power supply start and stop device of microwave multi- stage amplifier - Google Patents

Abstract

PURPOSE:To avoid overloading even for a moment by shifting the timing of a start time and a stop time of bias voltage impression of a microwave multi- stage amplifier at each stage. CONSTITUTION:The microwave multi-stage amplifier of four-stage constitution consists of inter-stage isolators 11-15, input/output separation isolators 16-19, reflection amplifiers 21-24, constant current setting circuits 25-28, delay circuits 29-32 and a constant voltage power supply 33. An input signal Pin is inputted from a port 10 and an output signal Pout is extracted from a port 20. A DC bias voltage of the amplifiers 21-24 is impressed from a power supply 33 via the circuits 29-32 and 25-28. In setting the delay time of the circuits 29- 32 as t4<t3<t2<t1 at start, no overload is caused even when the signal Pin is inputted. In setting the delay time of the circuits 29-32 as t4>t3>t2>t1 at stop, the amplifiers are stopped in the order of 21 22 23 24 and no overload is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a power supply start/stop device for a multistage microwave amplifier.

[Technical background of the invention and its problems] Injection-locked amplifiers using two-terminal negative resistance elements such as Gunn diodes and Invat diodes as power amplifiers in microwave bands and microwave bands There is a resistive amplifier. The operating negative impedance of these diodes is highly dependent on high frequency voltage amplitude, and in order to effectively extract a large output, it is necessary to set the operating conditions near the optimum high frequency voltage amplitude.

Figure 1 shows the high frequency voltage amplitude VRF of the invat diode.
This is an example of the output characteristics for. Curve +11 in the figure
, t2), and (3) are the output characteristics when the DC bias voltage is kept constant, and have a maximum output point with respect to an increase in VnF, and with higher high-frequency voltage amplitude (overload operation), the output decreases rapidly. The region to the right of the maximum output point (indicated by the broken line) of each DC bias voltage is the overload operation region, and operating in this region will not only cause deterioration of characteristics but also lead to permanent deterioration or damage to the device itself. It has been known.

By loading such an invat diode into a high frequency circuit and using an input/output separation circulator, a reflection type injection-locked amplifier or a negative resistance amplifier can be constructed.

To configure a high-output power amplifier in the microwave band or millimeter wave band, a multi-stage configuration is usually used in which the final stage is set to high output and low gain, the excitation stage is set to medium power, and the previous stage is set to high gain.

Conventionally, the starting mechanism for applying DC bias in such a multistage amplifier connects the primary side of a constant current circuit provided in each stage to the same constant voltage source, and starts and stops by turning on and off this constant voltage source. I was doing it.

Therefore, DC bias is applied to each diode almost simultaneously, or, because the operating current in the latter stage is usually large, it is applied to the latter stage with a certain delay.

If such a conventional multi-stage amplifier is started or stopped while an input signal is present, it is possible that the subsequent stage will be excited by a large high-frequency voltage amplitude before it has reached a sufficiently normal DC operating voltage. In this case, the above-mentioned overload operation may occur and the element may deteriorate or be damaged. In order to save power, especially in wireless equipment, the power amplifier is often started and stopped each time a call is made, and even if starting and stopping once does not cause complete damage, repeated overload operations can shorten the operating life due to fatigue. There are problems such as being exposed.

Also, in the case of an injection-locked amplifier, there is a free-run output even when there is no input signal.

If the startup of the subsequent stage is delayed, it will similarly result in overload operation, resulting in problems such as shortened operating life.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and by shifting the start time and stop time of bias voltage application of a microwave stage amplifier for each stage, it is possible to It is an object of the present invention to provide a power supply start/stop device for a microwave stage amplifier configured to prevent overload operation.

[Summary of the invention]

That is, the present invention provides a power start/stop device for a microwave staged amplifier, which is formed by connecting a plurality of injection-locked amplifiers using two-terminal negative resistance elements in multiple stages. The structure is such that the rear stage side is earlier than the front stage side, and the stop time of bias voltage application in each stage is constructed so that the latter stage side is slower than the front stage side.
- It is a power supply start-up and stop device for microwave stage amplifiers.

(Embodiments of the Invention) Next, the principle of the power supply start/stop device for a microwave stage amplifier according to the present invention will be explained with reference to FIGS. 2 and 3.

In other words, the figure is an example of a four-stage amplifier, (6), o4゜(
6), U→, (G) is the groin isolator, head, housing η, (
), Ql is the input/output separation circulator, Vυ, @
, cg, (c) are reflection type injection-locked amplifiers or reflection type resistance multipliers (hereinafter simply referred to as reflection type width amplifiers), (a) and (e).

@, (c) are constant current setting circuits, and 4, (to), Gυ, ■ are delay circuits.

The input signal (Pin) is the baud of the isolator (6))
The input is from 0I, and the amplified output (Pout) is taken out from the boat of isolator 4. Reflective layer width υ.

The DC bias terminals of (support), -, ■ are connected from the constant voltage power supply ■ to the delay circuit -, (1), cl◇, C13a and the constant current setting circuit (a), (e), (5), (ha). ) is applied via.

FIG. 3 is a diagram for explaining the function of FIG. 2, and shows startup characteristics. That is, each delay circuit.

For example, if the delay times of (1), e), and (2) are set to t4<ta<tz<tt at startup, the reflective layer width device ψ
η, @.

Since the DC bias voltage is applied in the order of A4 → A3 → A2 → A1 to the wires, the subsequent stage amplifier 1, for example, wires.

d, Cn, etc. do not become overloaded at startup even when the input signal (Pin) is input.

Normally, the gains of the front-stage amplifiers C2]), @, etc. are set relatively large, so the input signal level (Pin) is sufficiently small to prevent overload operation.

Also, when stopping, if the delay time of each delay circuit (a), (1), Gυ, (to) is set in reverse to ta > ts > ta > tt, the circuits will stop in the reverse order from when starting, and all will be overloaded. movement can be avoided.

Next, a specific embodiment of the power supply start/stop device for a microwave stage amplifier according to the present invention will be described with reference to FIG. However, the same reference numerals as in FIG. 3 indicate the same parts and will not be specifically explained.

That is, the microwave amplifier C11°+4 with a multi-stage configuration
7J, (431, 14→ element DC bias circuit as constant current setting circuit Is, (4bl, (dn,
(Decoy and relay (491, (in, +50, set as shown by 6 sides.) And each relay [491,5
G.

Gυ, 6-wheel driver (49a), (50a), (5
1a).

(52a) are DC amplifiers tn and +541, respectively.
, 15, (G), AND circuit 57), (C), (51
A delay circuit consisting of , CR, etc., 6υ, ts2, f
6.1, 641, 1!9, (6G (each week g
Time t t.

tt , t , 114 Its , ta , tt ) as shown in the figure.

Figure 4 tb) shows the power supply startup ψ in the circuit of Figure 4 18).
It is an explanatory diagram of sequence operation at the time of a stop.

Now delay circuit n, al) t ts3 + 13
, t6a , (65) l (eGl c7) Let each delay time be ty <ts <ts <tt <tt
+ 0 < t4, if you set it like ts, when the power is turned on, the microwave amplifier t4+), 41, 14: ri, G14 will start in the order of A4 → A3 → A2 → Al, and when the power is stopped, it will turn on in the order of A1 → A2 → The functions of this embodiment are achieved by stopping in the order of 8 and A4.

In Fig. 4(a), relays 4, 51, 61),
For example, a magnetically driven mechanical switch, a photocoupler,
Transistor switches etc. are used.

FIG. 5 is a start-up characteristic diagram for explaining the function of another embodiment of the start-up stop device for a microwave multi-stage amplifier according to the present invention. However, the same symbols as in Fig. 3 indicate the same parts, and P
i, do not explain.

In the case of an invat diode, the operating α current begins to flow when it is above the breakdown voltage vB, and as shown in the figure, the voltage in the stopped state is tVn+△V.

Even if the current is changed to Δ, the effects described in the explanation of FIGS. 2 and 3 remain the same. That is, the starting characteristic diagram teIri' in FIG.
dL pressure change force Vor-(VB +ΔV) ”'Ctb
t), compared to VOP, can be as follows. Therefore, reliability can be improved because adverse effects such as current spikes caused by transient phenomena during on/off times and electric shocks due to element terminal voltages can be alleviated.

In the explanation of the above-mentioned embodiment, the starting and stopping of the DC bias voltage as the bias voltage was described, but when operating with a pulse voltage, starting and stopping are repeated for each bias pulse voltage, so the subsequent stage is as shown in Fig. 6. Applied pulse voltage (VOPI) (Vop*), (VOP
3), (VOP4) (Dot wide (1,,) <
The start and stop times of the pulse voltage may be set as shown in the figure.

Further, in the above-mentioned embodiment, a four-stage microwave amplifier was described, but it goes without saying that the present invention is not limited to this.

〔Effect of the invention〕

In the multi-stage connected microwave amplifier as mentioned above,
By configuring the startup time of bias voltage application in each stage to be earlier on the rear stage side than on the former stage side, and configuring the stop time to be later on the former stage side and later on the latter stage side, the transition time when starting and stopping the power supply can be maintained. Since overload operation in the microwave amplifier can be prevented, and therefore deterioration and damage of the negative resistance amplification element can be prevented, the reliability of the microwave stage amplifier can be improved.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the output characteristics of an invat diode with respect to high-frequency paper pressure amplitude, and FIG. 2 is a circuit diagram showing the principle of the power start/stop device for a microwave multistage amplifier of the present invention.
FIG. 3 is an explanatory diagram of the start-up characteristics of FIG. 2, FIG. 4 is a diagram showing an embodiment of the power supply start/stop device for a microwave multi-stage amplifier of the present invention, and FIG. 4+aJ is a circuit configuration diagram. , FIG. 4(b) is a function explanatory diagram, FIG. 5 is a start-up characteristic diagram of another embodiment of the power supply start/stop device for a microwave multistage amplifier of the present invention, and FIG. FIG. 7 is a characteristic diagram at the time of starting φ and stopping in still another embodiment of the power supply starting/stopping device for an amplifier. 11.12,13,14.15...Mainrator 1
6.17, 18, 19...Circulator 21.2
2, 23, 24...Reflection amplifier 25, 26, 27
, 28, 45, 46, 47.48...constant current setting circuit 29.30, 31, 32, 60, 61, 62, 63,
64, 65.66...Delay circuit 49.50, 51.52...Re -53.
54, 55.56...DC amplifier 57.58.59
...AND circuit agent Patent attorney Inoue - Male Figure 1 hr /Vt)c, → Figure 2 Figure 3 Figure 5 Figure 4 (β) Figure 6 θI L″u tJstz”t f−−+

Claims (1)

[Claims] In a power supply start/stop device for an injection-locked amplifier using a two-terminal negative resistance element or a microwave staged amplifier which is formed by connecting multiple negative resistance amplifiers in multiple stages, the start-up time for bias voltage application to each stage The microwave step type amplifier is characterized in that the bias voltage application in each stage is configured to be stopped earlier on the rear stage side than on the front stage side, and the stop time of bias voltage application in each stage is configured to be slower on the latter stage side than on the front stage side. Power start/stop device.