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Insert a resistor in series with a capacitor into your transistor amplifier circuit to adjust the small-signal gain without affecting the operating point:
Opamps in CircuitShepherd are modeled by a voltage controlled voltage source (VCVS) and an output resistance. "AOL" (open-loop gain) and "Rout" (output resistance) are changeable properties. In case of AC-simulations the VCVS also has a frequency dependence defined by the
For slow changes of Vin, the small-signal gain is approximately -1.
What's the small-signal gain for fast changes? Is it approximately -1, -2, or -4?
Assume the transistor to have infinite bandwidth.
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Added new features to set up AC simulations with non trivial stimuli like multi-phase systems (see screenshot for an example).
Here is the full changelog:
Version 1.8.1 - 23 May 2023:
Added a
Which passive filter circuit has a bode plot, most similar to that of the active filter circuit? A, B or C?
Assume an ideal op-amp with infinite bandwidth.
The correct answer is C 😉
The video shows how to modify the circuit to meet another Thévenin equivalent of 5V and 30kOhms, while a side condition of R1+R2 = 20kOhms is maintained 😎
In CircuitShepherd, you have two modes for measuring the small-signal gain: HF (high frequency) and LF (low frequency). The HF mode measures the small-signal gain for fast changes of the input signal, while the LF mode measures the small-signal gain for slow changes of the input
How to design any second order passive RC-lowpass (PT2) in seconds:
1. Select the “second order RC lowpass” template.
2. Select the voltmeter.
3. Adjust the “f [Hz]” to the desired 3dB corner frequency.
DONE!
Which bode plot is correct? A, B or C?
Assume an infinite gain-bandwidth product of the opamps.
(You may know this circuit as the input stage of an instrumentation amplifier.)