Transistor constant bias circuits

A circuit (FIG. 4) in which a sub-circuit comprised of a bias transistor (T1), a feedback reisistor (R2) connected between the collector of this transistor (T1) and its base, and, a drive transistor (T2), is connected to its polarity-inverse sub-circuit (T1', R2', T2') in a ring confi...

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Bibliographic Details
Main Author MOON; PHILIP A. K
Format Patent
LanguageEnglish
Published 09.08.1988
Edition4
Subjects
CONTROLLING
PHYSICS
REGULATING
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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Summary:A circuit (FIG. 4) in which a sub-circuit comprised of a bias transistor (T1), a feedback reisistor (R2) connected between the collector of this transistor (T1) and its base, and, a drive transistor (T2), is connected to its polarity-inverse sub-circuit (T1', R2', T2') in a ring configuration and is initiated by means of current injection from a start-up bias circuit. The latter may comprise a bias transistor (T1''), a drive transistor (T2'') the base of which is connected to the collector of the bias transistor (T1''), and a pair of feedback current/voltage divider resistors (R1'', R2'') in the collector path of the bias transistor (T1''). Following start-up, constant current is maintained by feedback in the ring, and this current may be tapped at an appropriate point in the ring.
Bibliography:Application Number: US19870011098