G - Physics – 05 – F
Patent
G - Physics
05
F
330/21, 323/4, 3
G05F 3/30 (2006.01)
Patent
CA 1216904
-19- ABSTRACT: Current stabilizing circuit arranged between a first and a second common terminal (5 and 6), the circuit comprising a first circuit formed by the series arrangement of a first PNP-transistor (T1) and a second NPN-transistor (T2), and a second circuit formed by the series arrange- ment of a third PNP-transistor (T3), a fourth NPN-tran- sistor (T4) and a first resistor (R1). The commoned bases of the second and fourth transistors (T2 and T4) are driven by a first differential amplifier (3), whose non-inverting input is coupled to the collector of the second transistor (T2) and whose inverting input is coupled to a tap (7) of a voltage divider (R2,R3) formed by a second and third resistor. The commoned bases of the first and third transistors (T1 and T3) are driven by a second differen- tial amplifier (4), whose non-inverting input is coupled to the collector of the third transistor (T3) and inverting input to the tap (7) of the voltage divider (R2,R3). Because of the drive by means of the first and second amp- lifiers (3 and 4), the collector-base voltages of the first and third transistors (T1 and T3) and of the second and fourth transistors (T2 and T4) vary to an equal extent in the event of supply voltage variations, as a consequence of which the symmetry of the circuit is preserved.
458199
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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