Red curve plots uncompensated RW (~150 Ω), note the 20 dB loss from both ends of the span. Black curve plots the case where RW is compensated with negative resistance (R4 = RW = 150)
| Authors | Stephen Woodward |
| Main Document | Article «Digital pot can control gain over a 90 dB span like an electromechanical» |
| Description | Figure 4 |
| File Format / Size | PDF / 9 Kb |
| Document Language | English |
Other Materials from the Main Document
- Article «Digital pot can control gain over a 90 dB span like an electromechanical»
- Figure 1. Grounded wiper makes R2 serve as both input attenuator and output gain set
- Figure 2. R2 has the same function as in Figure 1 with DC bias from R4R5C2 to accommodate bipolar signals. But what about RW wiper resistance effects?
- Figure 3. Positive and negative feedback loops around A2 combine to create active negative resistance = -R4
- Figure 4. Red curve plots uncompensated RW (~150 Ω), note the 20 dB loss from both ends of the span. Black curve plots the case where RW is compensated with negative resistance (R4 = RW = 150)
- Figure 5. Gain curve using the mechanical pot is identical to Dpot with negative resistance RW compensation
