Moreover, the amplification section self-heating promotion control means (2, 5), for example, perform bias control of the amplification section (1) as a control for promoting the self-heating by the amplification section (1).

The amplifying section (119) amplifies the received signal.

The analog section includes a sensor excitation sub-section and a signal amplification sub-section.

An amplifier section present in the known switch merely serves to amplify the signal.

An optical amplifier section (20) amplifies the light of the basic wavelength.

A semiconductor laser (10) that includes a feedback laser section (12) and an amplifier section (14).

Radio frequency amplifying section amplifies the radio frequency signal provided from optical pick-up section.

An amplifying section (5) multiplies the output from the multiplying section (3) by a fixed factor (λ times).

There is provided a transmission amplifier for amplifying a signal to be transmitted, capable of effectively heating an amplification section when its temperature is low.

The system comprises two acoustic emission sensors (14, 15), an amplification section (16), a signal processing section (18) and an indicator section (20).

An amplitude amplifying section (14) supplies the amplitude modulating section (15) of a voltage corresponding to the magnitude of the inputted amplitude signal.

A device for multiplying charges of every pixel without providing any amplifying section.

A first amplifier section is connected to the first input (300) and the second input (301) is present.

An amplification section can be inserted between the electro-optically passive and the electro-optically active sections.

The acoustic emission sensors (14, 15) are electrically connected to the amplification section (16) which is electrically connected to the signal processing section (18).