ice:servo-opls
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ice:servo-opls [2019/11/18 23:29] – [Table] Michael Radunsky | ice:servo-opls [2021/05/20 22:42] – external edit 127.0.0.1 | ||
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Please read [[: | Please read [[: | ||
- | The guide to programming the ICE-CP1 through serial commands can be [[ice: | + | The guide to programming the ICE-CP1 through serial commands can be [[ice: |
===== Description ===== | ===== Description ===== | ||
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| Current range | | Current range | ||
| Current setpoint resolution | | Current setpoint resolution | ||
- | | Current noise density((All measurements guaranteed on design and verified experimentally on D2-105 which uses same circuit.)) | + | | Current noise density |
- | | RMS Noise (10Hz - 100kHz)((All measurements guaranteed on design and verified experimentally on D2-105 which uses same circuit.)) | + | | RMS Noise (10Hz - 100kHz) |
- | | RMS Noise (10Hz - 1MHz)((All measurements guaranteed on design and verified experimentally on D2-105 which uses same circuit.)) | + | | RMS Noise (10Hz - 1MHz) | < |
- | | RMS Noise (10Hz - 10MHz)((All measurements guaranteed on design and verified experimentally on D2-105 which uses same circuit.)) | + | | RMS Noise (10Hz - 10MHz) |
| Absolute accuracy | | Absolute accuracy | ||
^ Offset Phase Lock Servo Input Signal | ^ Offset Phase Lock Servo Input Signal | ||
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Two numbers control the offset frequency of the ICE-CP1: The divider setting N and the reference frequency. The divider setting N can be set to N=8,16,32 or 64. The reference frequency can be generated internally with a range from 50 - 240 MHz. Or an external frequency reference can be provided (external frequency must be from 32 MHz - 240 MHz). The offset frequency of the laser is given by the following formula: | Two numbers control the offset frequency of the ICE-CP1: The divider setting N and the reference frequency. The divider setting N can be set to N=8,16,32 or 64. The reference frequency can be generated internally with a range from 50 - 240 MHz. Or an external frequency reference can be provided (external frequency must be from 32 MHz - 240 MHz). The offset frequency of the laser is given by the following formula: | ||
- | <WRAP center round box 450px>< | + | <WRAP center round box 260px> **Offset = N * Reference Frequency** </ |
The table below shows the offset range for different values of N and using the internal or external frequency reference. | The table below shows the offset range for different values of N and using the internal or external frequency reference. | ||
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- | The charge pump in the OPLS outputs a signal proportional to the phase-error and the transfer function is as shown in <imgref xferfunc> | + | The charge pump in the OPLS outputs a signal proportional to the phase-error and the transfer function is as shown in <imgref xferfunc> |
=====Calculating Phase Noise ===== | =====Calculating Phase Noise ===== | ||
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The phase-noise specified in Section 1.3 is referenced to the phase frequency detector (PFD) at 1 Hz. To convert that to the noise measured on the actual beat-note, it must be rescaled with the following formula: | The phase-noise specified in Section 1.3 is referenced to the phase frequency detector (PFD) at 1 Hz. To convert that to the noise measured on the actual beat-note, it must be rescaled with the following formula: | ||
- | <WRAP center round box 450px>< | + | <WRAP center round box 450px> **D2-135 Phase-Noise Floor = -213 + 20Log(N) + 10Log(ƒ< |
- | where N is the value of the divider and F< | + | where N is the value of the divider and ƒ< |
ice/servo-opls.txt · Last modified: 2021/08/26 15:26 by 127.0.0.1