Device for converting a very-low-amplitude steady voltage signal

Electric power conversion systems – Current conversion – Encased in plug housing

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363134, 363141, 505867, H02M 7538

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active

053294408

ABSTRACT:
This device for converting a very-low-amplitude steady voltage signal into an alternating voltage signal, of the type comprising a centre-tapped transformer (1) associated with a transistor (3,4) chopper (2), is characterised in that the transformer (1) and the transistors (3,4) are arranged in a housing (15) held at very low temperature and in which is arranged a material (20) for thermal insulation of the transistors (3,4) with respect to the rest of the housing so as to reduce temperature fluctuations and allow operation of these transistors by self-heating due to their drive current.

REFERENCES:
patent: 3761742 (1973-09-01), Titus et al.
patent: 4074343 (1978-02-01), Chaussy et al.
McGrath et al, "Accurate Noise Measurements of Cryogenic Microwave Amplifiers and Mixers Using Variable-Temperature Loads," 15th Eur. Microwave Conf. Proc., pp. 477-482, Sep. 1985 (Paris).
Howard, "Optimization of Indium-Lead Alloys . . . ," IBM Journal of R+D, vol. 26, No. 3, pp. 372-378, May 1982.
Tien et al, "Glass Microsphere Cryogenic Insulation," Cryogenics, vol. 16, No. 10, pp. 583-586, Oct., 1976.

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