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A diode-connected transistor. when used as a load element, compensates for the fall-off in current rise time of the control transistor with increasing frequency.
English (United States)
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Diode Connected Transistor As Load
A diode-connected transistor. when used as a load element, compensates
for the fall-off in current rise time of the control transistor with increasing
Fig. 1 shows a transistor Q1 having its base B connected to its collector C
with an impedance Rb. This impedance may be only the normal base
resistance, or it can include an external impedance.
When Q1 is used as a load in a practical circuit such as Fig.
2, the current from C to E will be determined by the collector
current of Q2 as a current source. The rise time of this current is
limited by the cutoff frequency of Q2. A typical transistor, whose
cutoff frequency is 500 MHz, will have a collector current rise time
of 10 to 15 nanoseconds in response to a step function voltage at its
base. If the cutoff frequency of Q1 is less than that of Q2, the
current from C to E in Q1 will divide; initially, because of the low
current gain at high frequencies, more than the normal base current
will flow through Rb and produce a larger voltage from C to E than
would be expected at lower frequencies. Gradually, this portion of
the current from C to E will decrease, and the proportion of voltage
from C to E resulting from the current through Rb will also decrease.
The net effect is similar to the use of an inductance in series with
a load resistor to increase the high frequency response of a
transistor voltage amplifier.
The circuit of Fig. 2 uses three diode-connected transistors a...