The following settings and modifications were done for the CC-1 (Green Phase Coherent Control) Servo-filter to the original Servo-filter which electronic schematics and bill of material are saved on the wiki.
0- Current configuration:
Notch filter 1, Notch filter 2 ans LP filter are disable.
The Servo-filter must be set only on 1/f integrator.
The gain is set to minimum (position 0).
An attenuator of 20dB with a 50 Ohm load is set on the ERROR IN input.
The unity gain frequency was measured to 85Hz.
1-Setting of switches on the front panel:
* The differentiator shall be disabled on the front panel in setting the switch on "OFF".
* The switch INV/NON INV on the front panel, shall be set on INV.
2-Setting of the 8 straps on the board:
Notch filter 1, notch filter 2 and Low-pass filter are disabled in setting strap on connectors P7, P8 and P9 between pins 2 and 3.
* The transmission signal is ont used.
The strap on connector P4 (3 pins) is set between pin 2 and 3.
* Strap is set on connector P11 (3 pins), between pins 2 and 3, in order to activate the sample-and-hold on the triangular signal, on the locking.
* Strap is set on connector P3 (2 pins) to connect the triangular signal to the output stage.
* Strap is set on connector P2 (3 pins), between pins 1 and 2, for test purpose.
To check notch 1 and notch 2 filters (in scan mode) between TEST IN and TEST OUT. For this test the differentiator, shall be set on "ON" (not intuitive but important). After this test, the differentiator shall be disabled the front panel in setting the switch on "OFF".
* Strap is set on connector P1 (2 pins), in order to be able to tune the offset.
3-Modification of components:
* Integrator 1/f: corner frequency changed to 22 kHz
Capacitor CMS 1206: C38 = 3.3nF
* Integrator 1/f2: corner frequency changed to 22.5 Hz
Capacitor CMS 1206: C26 = C33 = 2200nF
Capacitor CMS 1206: C25 = C32 = 1000nF
* Low-pass filter: unchanged
* Notch filter 1: notch frequency changed to 11.8 kHz / quality factor changed to 0.9 (measured)
[Capacitor CMS 0805 1% : C49 ; C50 ; C51 ; C53 = unchanged (560 pF)]
Resistor CMS 1206 : R65 ; R66 ; R67 ; R68 = 24k
Resistor CMS 1206 : R73 = 13k
* Notch filter 2: notch frequency changed to 14.2 kHz / quality factor changed to 4.85 (measured)
[Capacitor CMS 0805 1% : C60 ; C61 ; C62 ; C63 = unchanged (560 pF)]
Resistor CMS 1206 : R79 ; R80 ; R81 ; R82 = 16k
Resistor CMS 1206: R89 = 1.3k
* Gain adjustment (G): Gmin = 0.4 / Gmax = 16.5 / Gtyp = 6
* Input impedance
Resistor CMS 1206 : R145 and R146 removed