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Friday, October 16, 2009 03:42 AM
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Base Current Compensated High Voltage Amplifier - Unpublished 1995 The base current of
a single transistor high voltage amplifier varies from unit to unit and over temperature
and current. To compensate, this opamp circuit measures base current and adds an
equal but opposite current to input. (added 9/04)
Envelope Follower Combines Fast Response Low Ripple - 12/26/02 EDN-Design Ideas:
Envelope followers extract amplitude information from complex audio waveforms. The
resulting dc voltage often drives nonlinear stages, such as voltage-controlled amplifiers
or filters. You must make a careful trade-off between the speed of response to a rapidly
changing input signal and the amount of ripple in the dc output that you can
tolerate.....(design idea added 1/05)
Level Shifter Follows Negative Output - 11/23/94 EDN-Design Ideas: Transistors Q1 and
Q2 in Fig 1, develop a feedback signal of the proper positive polarity for regulator IC1
from the circuit's negative output. You can use this simple technique to sense any
negative-voltage output. The regulator drives a charge pump comprising.....(design idea
added 6/06)
Voltage follower with 1G ohm input resistance - This circuit uses an LM11 to form a
voltage follower with 1G ohm input resistance built using standard resistor values. With
the input disconnected, the input offset voltage is multiplied by the same factor as R2;
but the added error is small because the offset voltage of the LM11 is so low. When the
input is connected to a source ….(electronic schematic added 08/08)
