TG4001 - 40MHz DDS Function/Arbitrary Generator

• 40MHz D.D.S. function generator with arbitrary capability
• 0.1mHz to 40MHz (50MHz square) range, 10 digit resolution
• Direct Digital Synthesis: stability, resolution, sine purity
• Arbitrary waveforms at up to 100MS/s
• Variable symmetry, variable start/stop phase
• Programmable via RS-232 and USB interfaces

40MHz sinewaves from a low cost DDS generator
The TG4001 provides high purity sine waves at up to 40MHz and square waves at up to 50MHz. No other DDS generator offers this performance at this price.

The output amplifier has a bandwidth approaching 100MHz ensuring that waveform quality is excellent right up to the frequency limits.

Amplitude flatness is better than ±0.2dB to 1MHz and ±0.4db to 40MHz.
Low noise design ensures minimum waveform aberrations and provides high waveform quality even at minimum output amplitude.

High speed arbitrary waveforms
In addition to it's eleven 'standard' waveforms, the TG4001can generate arbitrary waveforms of any length between 8 and 65,536 points at speeds of up to 100MS/s. Up to four arbitrary waveforms can be stored within the instrument.

Waveform Manager Plus software for Windows is supplied for waveform creation and editing on a PC. Waveforms are downloaded to the generator using RS232, USB or GPIB.

Pulse train generation
As well as standard and arbitrary waveforms, The TG4001 can generate pulse trains.

A pattern of up to 10 pulses can be quickly defined with each pulse having its own amplitude, width and delay. The whole pulse train pattern can then be replayed at a user defined repetition rate.

RS-232, USB or GPIB interfaces
The TG4001 includes both an RS-232 interface and USB interface as standard.
These interfaces can be used for remote control of all of the instrument functions and for storing instrument set-ups as well as downloading arbitrary waveforms.
A GPIB (IEEE-488) interface is also available as a retro-fittable option.

Synchronisation
The auxiliary output socket can provide any one of sixe different Synchronisation signals.

Waveform Sync provides square wave at the frequency of the main output.

Burst Done produces a pulse coincident with the last cycle of a burst.

Sweep Sync outputs a pulse at the start of each sweep to synchronise an oscilloscope or recorder.

Sweep Marker provides an additional output pulse for use as a marker in sweep mode.

Phase Lock Out can be used to phase lock two or more generators. Produces a positive edge at the 0 phase point.

Trigger Out provides a replica of the trigger signal which can originate from the trigger input socket, the internal trigger/gate generator, the manual trigger key, or the bus interface.

Wide range sweep
All waveforms can be swept over their full frequency range at a rate variable between 1 millisecond and 15 minutes.

Sweep can be linear or logarithmic, single or continuous. Single sweeps can be triggered from the front panel, the trigger input, or the digital interfaces.

A sweep marker is provided that is adjustable whilst sweep is running. The markers can provide a visual indication of frequency points on a ‘scope or chart recorder.

Amplitude modulation and signal summing
Amplitude modulation (VCA) and suppressed carrier modulation (SCM) are available for all waveforms using the rear panel modulation input.

A separate signal summing input is also provided, allowing waveforms from another signal source to be amplified and summed with the main output.

Triggered & gated modes, built-in trigger generator
All waveforms are available as a triggered burst whereby each trigger edge will produce one burst of the carrier. Start and stop phase is fully variable.

Both Triggered and Gated modes can be operated from the internal trigger generator, from an adjacent channel, an external source or a key press or remote bus command.

The trigger generator is variable between 0.005 Hz and 100kHz, and the signal is available as a separate output if required.

Tone switching & FSK
The TG4001 can provide triggered switching between up to 16 frequencies of standard or arbitrary waveforms.

Tone switching modes can be gated, triggered or FSK using any trigger source.

Frequency Shift Keying provides phase coherent switching between two selected frequencies at a rate defined by the switching signal source.

In tone switching mode the generator is set to switch between a number of different frequencies in response to a trigger signal.

Quick recall of settings
The TG4001 provides nine memories for storing settings (plus one memory for automatically storing the settings at switch off).

Because all parameters are controlled electronically, the memories store the complete set-up of the instrument.

Ease of use
The TG4001 is particularly easy to use. All of the main information is clearly displayed on a backlit LCD with 4 rows of 20 characters. Sub menus are used for the modulation modes and other complex functions.

All parameters can be entered directly from the numeric keypad. Alternatively most parameters can be incremented or decremented using the rotary encoder for quasi-analogue control.

Frequency or period entry
The generator frequency can be set in terms of either frequency or period.
Numeric entry can be floating point using whatever units the operator prefers, or can be done in exponent format.

Flexible amplitude entry
Amplitudes can be entered in terms of peak to peak voltage, RMS voltage or dBm.
The output amplitude can be set in terms of either the voltage into a 50Ohm or 600Ohm termination, or in terms of the source EMF (for a high impedance load).

Waveform Manager Plus

Waveform Manager Plus (supplied) provides all of the features needed for the creation, manipulation and management of arbitary waveforms within a single Windows based program.

Choice of interfaces
The program supports RS232, USB and GPIB interfaces for download and upload.

Upload from DSOs
The program can read several file formats and supports waveform import via the clipboard allowing it to accept waveform files from most DSOs and digitisers. 

A full suite of tools
Powerful mathematical functions are combined with on-screen drawing tools and clipboard functions to enable virtually any waveform to be created either from scratch, or from the editing of existing waveforms.

Waveforms can be built in any number of sections using any combination of the following: Standard waveforms, mathemati- cal expressions, drawn waveforms, uploaded waveforms, imported waveforms (using clipboard), existing stored waveforms.

Waveforms can be viewed with variable zoom and printed with annotation. Waveform management tools include Projects and Libraries for professional organisation.