Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1988-12-01
1990-05-29
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
330277, H03F 316
Patent
active
049299123
ABSTRACT:
In a current mirror circuit (19) provided with a current mirror (29), an input (31) and an output (33) of which are coupled to an input (1) and an output (2), respectively, of the current mirror circuit (19), and a limiter circuit which having a reference current source (37) and a unilaterally conducting element (D1) having a transistor (T4), a source electrode of which is coupled to the input (1) of the current mirror circuit (19), a control electrode of this transistor (T4) is coupled to the reference current source (37), to a further output (35) of the current mirror (29) and to a reference voltage terminal (41) via a further unilaterally conducting element (D2), and a drain electrode of the transistor is coupled to a power supply terminal so that exclusively high-ohmic elements are connected to the further output (35) of the current mirror (29) at the instant when a current (I3) related to an input current (I1) of the current mirror (29) and flowing through the further output (35) of the current mirror (29) becomes equal to a reference current (I.sub.ref) supplied by the reference current source (37), at which instant of transition the input current (I1) of the current mirror (29) thus reaches its permitted maximum value (I'.sub.ref), so that, if the current (I3) through the further output 35 of the current mirror (29) further increases, the control electrode potential of the transistor (T4) will increase considerably, resulting in the transistor (T4) changing over rapidly to the conducting state.
REFERENCES:
patent: 4331981 (1982-05-01), Parker
patent: 4340904 (1982-07-01), Wingrove, Jr.
patent: 4471292 (1984-09-01), Schenk et al.
patent: 4679092 (1987-07-01), Blanken et al.
patent: 4701643 (1987-10-01), Laude et al.
Goodman Edward W.
Mottola Steven
U.S. Philips Corporation
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