2118-2128: revise noise/jitter note

2118-2128.tex

@@ -36,7 +36,7 @@
 
     Each channel supports 50\textOmega~terminations, individually controllable using DIP switches. Outputs tolerate short circuits indefinitely. Both cards are capable of a minimum pulse width of 3ns.
 
-    Note that isolated TTL cards are less suited to low-noise applications as the isolator itself injects noise between primary and secondary sides. Cable shields may also radiate EMI from the isolated grounds. For low-noise applications, use non-isolated cards such as 2238 MCX-TTL or 2245 LVDS-TTL.
+    Isolated TTL cards are not well suited to low-noise or low-jitter applications due to interference from isolation components. For low-noise applications, use non-isolated cards such as 2238 MCX-TTL or 2245 LVDS-TTL.
 
 % Switch to next column
 \vfill\break
@@ -359,6 +359,8 @@
     \end{threeparttable}
     \end{table}
 
+    Low-jitter applications should note carefully the jitter introduced by the signal isolator. Noise is also introduced between the primary and secondary domains by the DC/DC converter. Where noise or jtter are crucial, it is instead recommended to use non-isolated cards such as 2238 MCX-TTL or 2245 LVDS-TTL.
+
     Minimum pulse width was measured by generating pulses of progressively longer duration through a DDS generator and using them as input for a BNC-TTL card. The input BNC-TTL card was connected to another BNC-TTL card as output. The output signal is measured and shown in Figure \ref{fig:pulsewidth}.
 
     \begin{figure}[ht]

examples/unsorted

@@ -0,0 +1,99 @@
+from artiq.experiment import *
+
+class SineWave(EnvExperiment):
+    def build(self):
+        self.setattr_device("core")
+
+        self.leds = dict()
+        self.ttl_outs = dict()
+        
+        self.dacs_config = dict()
+        self.dac_volt = dict()
+        self.dac_dds = dict()
+        self.dac_trigger = dict()
+        
+        ddb = self.get_device_db()
+        for name, desc in ddb.items():
+            if isinstance(desc, dict) and desc["type"] == "local":
+                module, cls = desc["module"], desc["class"]
+                if (module, cls) == ("artiq.coredevice.ttl", "TTLOut"):
+                    dev = self.get_device(name)
+                    if "led" in name: 
+                        self.leds[name] = dev
+                    else:
+                        self.ttl_outs[name] = dev
+                
+                if (module, cls) == ("artiq.coredevice.shuttler", "Config"):
+                    dev = self.get_device(name)
+                    self.dacs_config[name] = dev
+
+                if (module, cls) == ("artiq.coredevice.shuttler", "Volt"):
+                    dev = self.get_device(name)
+                    self.dac_volt[name] = dev
+                
+                if (module, cls) == ("artiq.coredevice.shuttler", "Dds"):
+                    dev = self.get_device(name)
+                    self.dac_dds[name] = dev
+                
+                if (module, cls) == ("artiq.coredevice.shuttler", "Trigger"):
+                    dev = self.get_device(name)
+                    self.dac_trigger[name] = dev
+                
+        
+        self.leds = sorted(self.leds.items(), key=lambda x: x[1].channel)
+        self.ttl_outs = sorted(self.ttl_outs.items(), key=lambda x: x[1].channel)
+
+        self.dacs_config = sorted(self.dacs_config.items(), key=lambda x: x[1].channel)
+        self.dac_volt = sorted(self.dac_volt.items(), key=lambda x: x[1].channel)
+        self.dac_dds = sorted(self.dac_dds.items(), key=lambda x: x[1].channel)
+        self.dac_trigger = sorted(self.dac_trigger.items(), key=lambda x: x[1].channel)
+        
+
+    @kernel
+    def set_dac_config(self, config):
+        config.set_config(0xFFFF)
+
+    @kernel
+    def set_test_dac_volt(self, volt):
+        a0 = 0
+        a1 = 0
+        a2 = 0
+        a3 = 0
+        volt.set_waveform(a0, a1, a2, a3)
+
+
+    @kernel
+    def set_test_dac_dds(self, dds):
+        b0 = 0x0FFF 
+        b1 = 0
+        b2 = 0
+        b3 = 0
+        c0 = 0
+        c1 = 0x147AE148 # Frequency = 10MHz
+        c2 = 0
+        dds.set_waveform(b0, b1, b2, b3, c0, c1, c2)
+    
+    @kernel
+    def set_dac_trigger(self, trigger):
+        trigger.trigger(0xFFFF)
+
+    @kernel
+    def run(self):
+        self.core.reset()
+
+        self.core.break_realtime()
+        t = now_mu() - self.core.seconds_to_mu(0.2)
+        while self.core.get_rtio_counter_mu() < t:
+            pass
+
+        for dac_config_name, dac_config_dev in self.dacs_config:
+            self.set_dac_config(dac_config_dev)
+
+        for dac_volt_name, dac_volt_dev in self.dac_volt:
+            self.set_test_dac_volt(dac_volt_dev)
+
+        for dac_dds_name, dac_dds_dev in self.dac_dds:
+            self.set_test_dac_dds(dac_dds_dev) 
+
+        for dac_trigger_name, dac_trigger_dev in self.dac_trigger:
+             self.set_dac_trigger(dac_trigger_dev)