R4C2 = T_D = 212 ns = nonlinearity compensation for 555 internal delays

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Other Materials from the Main Document

• Article «1 MHz 555 VFC»
• Figure 1. Starred components are precision, including the +5 V supply, but something's missing
• Figure 2. Nonlinear red curve versus ideal black shows ~20% linearity error from LMC555 internal delays
• Figure 3. R4C2 = T_D = 212 ns = nonlinearity compensation for 555 internal delays
• Figure 4. Nonlinearity disappears if R4 = T_D/C2 = 212 нс/300 пФ = 706 Ом