| Internal |
NRZ Patterns: Square Wave, User Defined Pattern, 7-bit PRBS, 9-bit PRBS, 11-bit PRBS, 15-bit PRBS.
User Defined Pattern: 16384 states can be created in the instrument or downloaded via the remote interfaces.
Bit rate: 1mbits/sec - 1Mbits/sec
Modulation signal available at MOD IN/OUT, 150 Ω source impedance |
| External |
Input via MOD IN/OUT: DC - 1Mbits/sec, >=2Vp-p, logic threshold +1.5V nominal.
10kΩ input impedance |
| Source |
External +ve edge, External -ve edge, Manual, via remote interface or Internal.
Internal trigger repeats at a programmable rate of 1 per 1us - 999.999999s |
| Modes |
Immediate: Modulation starts immediately.
Triggered: Modulation waits for a trigger event. |
| Trigger Types |
Infinite: First trigger event starts the modulation pattern, which repeats indefinitely.
Finite: Each trigger event starts one modulation pattern (one ‘block’) or a count of bits in the modulation pattern. The bit count is programmable and can be greater than a pattern length.
Bit count range: 1 - 2^31 |
| Trigger Delay |
<500ns from specified edge of external trigger signal to modulation start. |
| Signal available from the rear panel SYNC BNC to synchronise internally produced modulation patterns. |
| SYNC modes |
OFF, Start, Bit Rate, Bit Rate/2 |
| SYNC polarity |
High going SYNC pulse |
| Start SYNC |
SYNC pulse 1 bit period wide at the start of the modulation pattern. |
| Bit Rate SYNC |
½-bit period wide pulses at the modulation bit rate repeated indefinitely or for a programmed repeat count from the start of the modulation pattern in triggered mode. |
| Bit Rate/2 SYNC |
As for Bit Rate SYNC but at half the modulation bit rate. |
| Modes |
FSK, GFSK, MSK, GMSK, HMSK, 3FSK, 4FSK
Continuous phase frequency modulation. |
| Filter Settings |
None, Gaussian (BT=0.3, 0.5 or 0.7), Raised Cosine (α =0.5 or 0.7), Root Raised Cosine (α =0.5 or 0.7), Half sine. |
| Deviation |
1mHz - 1MHz subject to carrier frequency |
| Deviation Setting Resolution |
1mHz |
| Deviation Accuracy |
Ref freq accuracy ±1mHz for internal and external modulation |
| 4FSK Encoding |
Gray Code or Binary. |
| Encoding Synchronization Internal Modulation Source |
3FSK Start SYNC output indicates the start of encoding
4FSK Bit Rate/2 SYNC output indicates the start of encoding |
| Encoding Synchronization External Modulation Source |
3FSK / 4FSK
The external Trigger input can be used to define the start of encoding for both. |
| Modes |
PSK |
| Deviation |
0 - 25.00 rad |
| Deviation Setting Resolution |
0.01 rad |
| Deviation Accuracy |
Ref freq accuracy ±0.1 rad for internal and external modulation |
| ASK Depth |
0 - 100% |
| Setting Resolution |
0.1% |
| Accuracy |
±1% for internal and external modulation |
| Internal Rate |
1mb/s - 1Mb/s |
| External Rate |
DC - 1Mb/s |
| On-Off Ratio |
>80dB |
| External Input |
Logic high = Carrier On |
| Internal Rate |
1mB/s - 1Mb/s |
| External Rate |
DC - 1Mb/s |
| Rise/Fall Time |
50ns |
| ** Digital modulations available with TGR-U01 option (see Option TGR-U01). |