JPS62217708A - High output amplifier - Google Patents

Abstract

PURPOSE:To reduce the power consumption by constituting a high output amplifier by a distributer and a synthesizer, connecting an amplifier in parallel in-between so as to allow the operation by any amplifier of parallel connection at the normal state for a long period and operate all the amplifiers in parallel when a short time high power is required. CONSTITUTION:Low output amplifiers G1-Gn-2 of the high output amplifier 1 and an output amplifier Gn-1 are connected in series and two high power amplifiers Gn are connected in parallel between the distributor 11 and the synthesizer 12. The amplifiers G1-Gn-1 are used as drivers, bias power supplies VG1, VD1, VG2, VD2 are connected to each amplifier Gn and the distributor 11 and the synthesizer 12 are connected by DC-cut capacitors C1-C4 at the input and output sides of the amplifier G. Then any of the amplifiers G applies the operation at normal state for a long period and all the amplifiers G are operated in parallel in requiring the high short time power to reduce the power consumption.

Description

[Detailed Description of the Invention] [Summary] This is a high-output amplifier, and by connecting amplifiers in parallel, only a part of the amplifiers are operated except during fading.

[Industrial application field]

The present invention relates to a high power amplifier that consumes a large amount of power and is installed in a rack in a large wireless device.

[Conventional technology]

Conventionally, the power of high frequency amplifiers used in wireless devices has been approximately constant.

That is, as shown in Fig. 5, when wireless communication is performed between transmitting and receiving devices, the radio waves radiated from the transmitting side antenna 1' not only reach the receiving side 2' in a straight line (solid line). , after being reflected from the ground (dashed line), or after being reflected from an air duct in the space (dotted chain line).

In this way, due to the fading phenomenon, the receiving antenna 2'
Conventionally, the modulated wave output from the modulator 14 is sent to the high-frequency amplifier 11' via the up-converter 13', since the power of the radio wave that reaches the area is weaker than that of the radio wave that arrives in a straight line.
The beam was amplified and radiated with sufficient margin to cope with fading.

[Problem that the invention seeks to solve]

Conventionally, the power of this amplifier 11' is large and constant, so when no fading occurs, the signal passed through the down converter 20' is converted to the AGC 21 on the receiving side.
The level of this received signal was lowered by ' and inputted to the demodulator 22'.

However, the fading phenomenon only occurs at a rate of less than 10% throughout the year.

Therefore, in order to prepare for the fading phenomenon that occurs with a small probability, a high frequency amplifier has conventionally been operated with a constant high power, which wastes power. For this reason,
There were problems in that the entire device including the heat dissipation device was large and the power source was inefficient.

In order to solve this problem, up converter 13'
Attenuator 12' (dashed line) between and amplifier 111'
It has been proposed that the high frequency amplifier 11' itself be operated in class A, so that the power consumption remains the same.

Means for Solving Problem C] An object of the present invention is to solve the above problems and reduce the power consumption of a high frequency amplifier provided on the transmitting side of a wireless device.

The means for this purpose is a high output amplifier 1 as shown in FIG.
A divider 11 and a combiner 12 are provided on the input side and a combiner 12 on the output side, respectively, and an amplifier Gn is connected in parallel between the divider 11 and the combiner 12.

[For production]

As described above, according to the present invention, a high-output amplifier is constituted by a divider and a combiner, and the amplifiers are connected in parallel between them.

Therefore, during long-term normal operation, one of the above-mentioned parallel-connected amplifiers can be operated, and when high power is required during short-term fading, all the amplifiers can be operated in parallel.

Therefore, compared to conventional consumptive car windows, power can be saved over a long period of time, making it possible to reduce power consumption.

Furthermore, since it can be operated with low power consumption during normal operation, the shape of the heatsink can be made simpler and smaller.

〔Example〕

The invention will now be explained by way of example with reference to the accompanying drawings.

FIG. 2, FIG. 3, and FIG. 4 are diagrams showing the first and second embodiments and modifications, respectively.

High power amplifier 1B and low power amplifier G1 in the embodiment of FIG.
... Gn2 and output amplifiers G,-, are connected in series, and two high-output amplifiers Gfi are connected in parallel between the distributor 11 and the combiner 12.

In the above, G,,-, serve as Gfi drivers. ■. vol is the bias power supply for the gate and drain of the FET constituting one amplifier G7, and VO2 and vnz are the bias power supplies for the gate and drain of the FET constituting the other amplifier G7, respectively.

Each of the capacitors C1 to C4 is for cutting off the DC component.

Now, the power consumption of each of G, to G,,-2 is W
, to W n-Z , c++-+ and that of 07 to W,
1-,,Wn, If the entire power consumption of amplifier 1 is W, then W, +WR-, +2Wn=”W ---=■W
Weight+W2+...w, 2=eW, .-----■ holds true.

Compared to the overall power consumption W, Gn-1 and 67 have almost the same power, and O, -1 and G and l consume most of the power of W, so from formula 0 and ■2, Approximately, the following formula 〇 holds true.

Wt+W. -, +2w.

zWn-1+2w,l 3W,,=W -Uniform ■The power represented by this ■ is when all the amplifiers are used, and the power reaching the receiving antenna decreases due to fading phenomenon, resulting in It's time to do it.

However, consider the case where, in most cases, only one of the high power amplifiers connected in parallel is used, for example by turning off the bias power supply VD2 or setting the drain voltage to a low value.

At this time, the total power W' is WL +J, -, +W.

Go W, l-, +W11 The thickness is 2W, 1=W' ・−・−・−■.

■As can be seen by comparing formulas 2 and 0, operating one of the amplifiers reduces the absolute value of gain by 6 dB and the percentage of power consumption by 33%.

In FIG. 3, the (n-1)th stage amplifier is connected in parallel in the same manner as the final stage (nth stage).

However, WM Let W□1=□.

In this case, as in the first embodiment, Wt” 2 w, l-, +2 W.

=3W, 1=6W, l−+ =w −−−−−■ On the other hand, in the second embodiment, VOZ and ■. If 4 is turned off or the drain voltage is set to a low value, W, +W□I +w, l 3rd Wn −+ =W ′ −−1−−■■
The power consumption ratio is reduced by 50% compared to the formula and formula 0, respectively.

FIG. 4 shows a modification in which isolators 111 to 114 are inserted, which is effective in avoiding deterioration of one frequency characteristic due to interference with other elements when the rebias power is cut off.

In this way, according to this embodiment, if parallel operation is performed only during short-term fading, and normally one power supply is cut off and operation is performed with only one amplifier connected in parallel, - as in the example, conventional constant power consumption can be reduced. It can save 2/3 or 172 times more power compared to the previous model.

〔Effect of the invention〕

As described above, according to the present invention, a high-output amplifier is constituted by a divider and a combiner, and the amplifiers are connected in parallel between them.

Therefore, during long-term normal operation, one of the above-mentioned parallel-connected amplifiers can be operated, and when high power is required during short-term fading, all the amplifiers can be operated in parallel.

Therefore, compared to the conventional case where power consumption is constant, power can be saved over a long period of time, making it possible to reduce power consumption.

Additionally, there is more leeway in thermal design, allowing for smaller size and lower cost.

[Brief Description of the Drawings] Fig. 1 is a diagram showing the principle of the present invention, Fig. 2 is a drawing showing the first embodiment of the invention, Fig. 3 is a drawing showing the second embodiment of the invention, Fig. 4 is a diagram showing the second embodiment of the invention.
The figure shows a modification of the present invention, and FIG. 5 is an explanatory diagram of the prior art. l...High output amplifier, 11...Distributor, 1
2...Synthesizer, G1...Gn...Amplifier, I
N...Input terminal, OUT...Output terminal.

Claims (1)

[Claims] A divider (11) is provided on the input side, a combiner (12) is provided on the output side, and an amplifier (G_n) is provided between the divider (11) and the combiner (12).
) are connected in parallel, and a part or all of the amplifier (G_n) is operated according to the required power by intermittent power supply of the amplifier (G_n). amplifier.