JPH01300625A - Transmitter - Google Patents

Abstract

PURPOSE:To improve the power utilizing efficiency and the performance of manufacture by using 2 class C power amplifiers in place of class A power amplifiers so as to combine the transmission power in terms of vector. CONSTITUTION:A transmission signal input terminal 1, a phase modulator 5 modulating the phase by dividing a signal given to the input terminal 1 into two signals, a class C power amplifier 6a amplifying one signal modulated by the phase modulator 5, a class C power amplifier 6b amplifying the other signal modulated by the phase modulator 5, an adder 7 combining output powders of the two class C power amplifiers 6a, 6b and an antenna 4 sending a modulation signal combined by the adder 7 in air as a radio wave are provided to the transmitter. The class C power amplifiers 6a, 6b are used in place of the class A power amplifier to amplify the modulation signal, then the transmitter is immune to the power voltage fluctuation, temperature fluctuation and secular change or the like. Thus, the utilizing efficiency of power is improved and the performance of manufacture is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a transmitting device used in digital mobile communications and the like.

Conventional technology FIG. 3 shows an outline of a conventional transmitting device.

In FIG. 3, 1 is a transmission signal input terminal to which a signal to be transmitted is applied, 2 is an amplitude phase modulator that modulates the amplitude and phase of the signal input to the transmission signal input terminal 1, and 3 is an amplitude phase modulator. A class A power amplifier 4 that amplifies the signal modulated by the modulator 2 is an antenna that transmits the modulated signal modulated by the class A power amplifier 3 into the air as a radio wave.

Next, the operation of the above conventional example will be explained using FIG. The signal applied to the transmission signal input terminal 1 is transmitted to the amplitude phase modulator 2
The signal is then phase-modulated and amplitude-modulated, amplified by the human-grade power amplifier 3, and output as a radio wave from the antenna 4.

In this way, the conventional transmitting device described above can also amplify and transmit signals whose amplitude and phase vary.

Problems to be Solved by the Invention However, when using the above-mentioned conventional class A power amplifier, the power utilization efficiency decreases, and due to its nonlinearity, the transmission spectrum narrowed by the amplitude phase modulator widens, etc. There was an issue.

The present invention solves these conventional problems,
The object of the present invention is to provide an excellent transmitting device that is resistant to power supply voltage fluctuations, temperature fluctuations, changes over time, etc., can improve power usage efficiency, and is stable in operation and easy to manufacture.

Means for Solving the Problems In order to achieve the above object, the present invention provides a phase modulator that divides a signal to be transmitted into two signals and modulates the phase thereof, and a phase modulator that modulates the phase of one signal modulated by the phase modulator. a class C power amplifier for amplifying, a class C power amplifier for amplifying the other signal modulated by the phase modulator, an adder for combining the output powers of the two class C power amplifiers; It is equipped with an antenna that transmits the combined modulated signal as radio waves, and is capable of transmitting the modulated signal.

Functions Since the present invention is configured as described above, it has the following functions. In other words, since the modulated signal is amplified using a class C power amplifier instead of a class A power amplifier, it is resistant to power supply voltage fluctuations, temperature fluctuations, changes over time, etc., improves power usage efficiency, and improves manufacturability. can also be improved.

Embodiment FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a diagram showing the relationship between the amplitude and phase of a signal according to an embodiment of the present invention.

In Figure 1, 1 is a transmission signal input terminal to which a signal to be transmitted is applied, and 5 is a transmission signal input terminal to which a signal input to transmission signal input terminal 1 is applied.
6a is a class C power amplifier that amplifies one signal modulated by the phase modulator 5; 6b is a class C power amplifier that amplifies the other signal modulated by the phase modulator 5; 7 is an adder that combines the output powers of the two C-class power amplifiers 6a and 6b, and 4 is an antenna that sends the modulated signal combined by the adder 7 into the air as a radio wave. .

Next, the operation of one embodiment of the present invention will be described based on FIG. 1 and with reference to FIG. 2.

It is assumed that a signal indicated by vector A in FIG. 2 is transmitted from the antenna 4 in response to an input signal applied to the transmission signal input terminal 1. A is vector B and vector C with the same absolute value
It is obtained by adding. However, MAX lA l≦2
Vector IB+ and vector IcI are selected so that 118+=21CI.

Here, the amplitude and phase of vector A are amplitude (A) = l A I , phase (A) = φ1, and the amplitude and phase of vector B are amplitude ([B) = l E l , phase (B) = φ3,
The amplitude and phase of vector C are expressed as amplitude (C)=ICI and phase (C)=φ4.

On the other hand, as shown in Figure 2, However, α=l’Bl=l(L’1 Tonashi, φ2 is each φ3-φ1+φ2 φ4=φ1-φ2 obtained as.

In this way, the input signal from the transmission signal input terminal 1 is converted into two vector signals having phases of φ3 and φ4 from the reference phase point by the phase modulator 5, and these signals are transmitted to the class C power amplifier 6a and the class C power amplifier, respectively. 6bK is sent to become a signal corresponding to vector B and vector B, and these signals are combined in adder 7 to form a signal of vector A. This signal is sent from antenna 4.

Effects of the Invention As is clear from the embodiments described above, the present invention uses two class C power amplifiers instead of the class A power amplifier in the conventional example to vectorially combine the transmission power, so that the two signals do not overlap with each other. Complementing each other, they have the effect of being resistant to power supply voltage fluctuations, temperature fluctuations, changes over time, etc., improving power usage efficiency, and improving manufacturability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an overview of a transmitting device according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the amplitude and phase of a signal in the embodiment of the present invention, and FIG. 3 is a diagram showing a conventional transmitter. FIG. 1 is a block diagram showing an outline of a transmitting device. 1... Transmission signal input terminal, 4... Antenna, 5...
・Phase modulator, 6a...Class C power amplifier, 6b...
Class C power amplifier, 7...adder.

Claims (1)

[Claims] A phase modulator that divides a signal to be transmitted into two signals and phase-modulates them, a class C power amplifier that amplifies one signal modulated by the phase modulator, and the other signal modulated by the phase modulator. A transmitting device comprising: a class C power amplifier that amplifies a signal of the class C power amplifier; an adder that combines the output powers of the two class C power amplifiers; and an antenna that transmits the modulated signal combined by the adder as a radio wave.