This is a sawtooth DCO, the comparator U1A resets the ramp at the desired frequency (thus controlling the frequency), and the voltage V7 applied to integrator U2A determines the rate of change of the the ramp (determines the amplitude). I am trying to find the values of RS2 and C1 of the integrator circuit.
- Maximum Integrator Input Voltage V7 = 5V
- Desired integrator Output Voltage after 500 microseconds = around 5V
- (500us since a frequency of 2000Hz as used in equation below)
- Op amp: TL084
- Input current at maximum voltage
I understand that the current flows straight through (virtual ground), so the equations below should apply. My question is, which value of C1, RS2 or max current is chosen first, and why?