Antilogarithmic 8-bit PWM gives s constant incremental ~5% per lsbit. Asterisked parts are 1% or better precision (metal film or C0G)

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• Article «5 decade antilogarithmic PWM current source»
• Figure 1. Antilogarithmic 8-bit PWM gives s constant incremental ~5% per lsbit. Asterisked parts are 1% or better precision (metal film or C0G)
• Figure 2. T_W = antilog R_TC_T timeout = 1 to 250 counts = 2 to 500 µs, where PWM - see figure
• Figure 3. A minimal 5-decade sawtooth oscillator that enables final conversion of the resulting 5-decade current source to a 5-decade frequency output
• Figure 4. Maximal 5-decade sawtooth oscillator, using Christopher Paul's DI (Ref. 1)
• Figure 5. Log (red) and linear (black) plot of source current versus PWM