Temperature stabilized amplifier for borehole use

Details Temperature stabilized amplifier for borehole use Temperature stabilized amplifier for borehole use

1981-10-29

1984-04-10

Mollins, James B.

Amplifiers

With semiconductor amplifying device

Including temperature compensation means

330264, H03F 318

Patent

active

044424108

ABSTRACT:
A temperature stabilized amplifier is disclosed in the preferred and illustrated embodiment. This amplifier must perform in spite of extreme temperature fluctuations encountered in down hole tools. It must provide an output signal which is a large voltage swing input to a cable suspending the amplifier and other apparatus in a well bore. The apparatus utilizes complementary symmetry VMOS output transistors with a third VMOS transistor supported on a common heat sink with one of the two output transistors. The third transistor, in conjunction with an inverting amplifier, forms a bias which is applied to the output transistors in a manner such that temperature drift is cancelled. This, then, overcomes temperature drift. This extends the operating range of the equipment markedly.

REFERENCES:
patent: 4302727 (1981-11-01), Iwamatsu

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