TG4001 40MHz DDS function generator, specifications and description

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. 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).

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