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In a transimpedance receiver, it is sometimes desirable that the output stage
have a high gain-bandwidth product and an extended dynamic range.
A circuit which meets these objectives includes a first pair of transistors 10
and 12 having a common emitter connection to a current source 14. The input
voltage is applied to the base terminals of the transistors 10 and 12. The
collector of transistor 10 is connected to a positive voltage source 16 through
serially connected resistors 18 and 20. The collector of transistor 12 is similarly
connected to the voltage source 16 through a second set of resistors 22 and 24.
The resistor 18 provides collector-to-base bias for a third transistor 26. Resistor
22 provides a corresponding bias voltage for a fourth transistor 28. The
transistors 26 and 28 have a common emitter connection to a second current
The output voltage from the circuit is taken across the collectors of the
transistors 26 and 28.
While the circuit gain, which is determined largely by the values of the
resistors 18 and 22. is relatively low, the gain-bandwidth product is high. The
dynamic range of the circuit is extended by the use of the current sources 14 and
30 in the common emitter circuits of the differential pairs of transistors. These
current sources permit maximum gain while preventing any of the transistors
from saturating. The output transistors 26 and 28 may turn off when driven by