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The amplifier with directly coupled stages operates with alternating current characteristics, utilizing depletion or inversion capacitors with little or no signal offset.
English (United States)
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Directly Coupled Amplifier with AC Characteristics
The amplifier with directly coupled stages operates with alternating current
characteristics, utilizing depletion or inversion capacitors with little or no signal
In Fig. 1, the amplifier is illustrated with a first stage 10 directly coupled to an
output or last stage 12 by conductor 14. During precharge, a positive pulse Phi is
applied to field-effect transistors T1 and T11, turning them on. T1 and T11 may
be turned off simultaneously or, if desired, in sequence to shunt noise rippling
through the amplifier. Field-effect transistors T2 and T3 are chosen to provide
unity gain, or less, while T1 is conducting. Consequently, any offset voltage in the
first stage is not amplified by subsequent stages. T2 may be chosen with a
higher width-to-length ratio than T3 so that an offset voltage of any previous
stage or stages is actually attenuated. If the width-to-length ratios of T2 and T3
were chosen to have a gain of 1/2 when T1 is conducting and each stage had a
maximum offset voltage of 50 millivolts, then the total offset voltage of the
amplifier would be < or = Sigma 50 + 25 + 12.5 + 6.25 . . . ., or < = 100 millivolts.
In the output stage 12, the offset voltage can be avoided entirely by
connecting the output to the gate electrode of transistor T12. When field-effect
transistor T11 is off or open-circuited, capacitor C2 maintains a constant voltage
between the gate and source electrodes of field-effect trans...