TRANSISTORS IN DIRECT CURRENT AMPLIFIERS

Journal Article · Sun Jan 01 04:00:00 EST 1961 · Neue Technik See NT, Neue Tech.

OSTI ID:4024055

Guggenbuhl, W

After a brief survey on the different methods of d-c amplification the problem of zero stability is treated in detail. The amplifiers are divided tnto two main groups, direct coupled types and chopper types. An equivalent circuit for d-c-drift in the active region of a transistor is shown, starting from the temperature dependence of characteristic d-c parameters. Remarks on aging are included. Some temperature compensated input stages with reduced drift are discussed. Different d-c amplifiers are compared using the equivalent drift power as a general measure for the performance of the circuits. An optimum source resistance for minimum drift power may be evaluated. The second part deals with chopper amplifiers. Transistor switching characteristics are compared with those of an ideal switch. Temperature variations of these characteristics and some circuit aspects of transistor choppers are discussed. In the last part the zero stability obtainable with these circuit techniques ts tabulated for some typical input stages. (auth)

• Research Organization: Contraves A.G., Zurich
• NSA Number: NSA-15-017104
• OSTI ID: 4024055
• Journal Information: Neue Technik See NT, Neue Tech., Journal Name: Neue Technik See NT, Neue Tech. Vol. Vol: 3: No. 1; ISSN NETEAS1
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

AMPLIFIERS
CIRCUITS
EFFICIENCY
ENGINEERING AND EQUIPMENT
PERFORMANCE
SWITCHES
TEMPERATURE
TRANSISTORS