: Feedback stability and parameter enhancement. Where to Find It
| Circuit | Stout’s Formula (Typical) | Modern Note | |---------|---------------------------|--------------| | Inverting gain | ( V_out = -\fracR_fR_in V_in ) | Same | | Non-inverting gain | ( V_out = (1 + \fracR_fR_g) V_in ) | Same | | Sallen-Key low-pass cut-off | ( f_c = \frac12\pi \sqrtR_1 R_2 C_1 C_2 ) | Same (use equal R and C for simplicity) | | Integrator | ( V_out(t) = -\frac1RC \int V_in dt ) | Add R in parallel with C for DC stability (~100× R) | | Schmitt trigger hysteresis | ( V_H = \fracR_2R_1+R_2 V_sat ) | Use rail-to-rail op-amp for predictable thresholds |
The handbook's primary goal is to provide a comprehensive, single-source manual for designing circuits using the modern operational amplifier (op-amp). Experienced Designers:
This is the most critical section for any engineer mindful of copyright.
If you are designing a circuit today, you might search the web for "precision rectifier circuit" or "voltage-controlled oscillator." You will find thousands of results, many of which are untested or overly complex. Stout’s handbook is a curated encyclopedia of topologies. It presents the fundamental circuits that just work:
While modern texts focus on ideal op-amps, Stout dives into real-world limitations:
: The handbook is renowned for its structured progression, moving from fundamental principles of op-amps to complex applications like waveform generators, active filters, and logarithmic circuits.
This format made it possible to build a working circuit without simulating it first—an invaluable feature before SPICE was widely available.
Stout’s work belongs to a genre sometimes called the “circuit designer’s cookbook.” Each recipe includes: