H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/20
H03F 3/45 (2006.01) H03F 3/30 (2006.01) H03F 3/343 (2006.01)
Patent
CA 1224544
ABSTRACT : "Amplifier arrangement". The preamplifier (10) of an amplifier arrange- ment comprises a differential amplifier which comprises a first and a second transistor (T1, T2) between whose emitters a first resistor (R1) is arranged and whose emitters are connected to the positive power-supply terminal (2) by a first and a second current source (I1 = I, I2 = I) respectively. The collector of the second transistor (T2) is connected to the negative power-supply terminal (3) via a third current source (I3 = 3.5I) and is coupled to the output (7) of the arrangement via a second resistor (R2). Two transistors (T3, T4) having commoned bases carrying a reference voltage (VR) are ar- ranged in cascade with the third current source (I3). The collectors of these transistors are connected to the positive power-supply terminal (2) via a fourth and a fifth current source (I4 = I, I5 = I) respectively and are coupled to the first and the second input (5,6) of the output amplifier (20) respectively. This output amplifier (20) comprises two of opposite conductivity types transistors (T5, T6) whose collectors are connected to the output (7). The resistance value of the second resistor (R2) has been so selected that the voltage on the output (7) as a result of the current flowing through this resistor (R2) in the quiescent state is equal to half the supply voltage.
475079
Fetherstonhaugh & Co.
N.v.philips'gloeilampenfabrieken
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