Tektronix AWG5204 Technical Reference

Specifications
Table 3: Real ti
me digital signal processing
Characteristics Description
Double Data Rate Interpolation (DDR
Mode)
Enabling DDR mode increases the output sample rate to 5 to 1 0 GS/s (2*fclk) and
interpolates the input sample data by 2X to match the output rate. 2X interpolation is
required for
sample rates above 5.0 GS/s.
With DDR enabled, the output image moves from (fclk - fout) to (2*fclk - fout). Because
the input data rate does not increase, the output bandwidth remains (fclk/2).
DDR is most u
seful when combined with digital up-conversion which a llows the user
to specify the output center frequency up to the DDR Nyquist frequency. When the
waveform is a traditional, real valued, waveform (not IQ), enabling DDR applies a low
pass filter a
t a frequency just below (fclk/2) so that no signal is generate between
(fclk/2) and (2*fclk - fclk/2).
Digital U p-conversion (DIGUP license
required)
The DAC system in each channel includes a digital IQ modulator and numerically
controlled oscillator (NCO ) that provides digital up-conversion to a specified carrier
frequenc
y
Digital up-conversion requires an IQ input waveform. In the IQ waveform I and Q
samples alternate in pairs or groups depending on the interpolation selection.
Digital u
p-conversion can only be used with sample rates between 2.5 and 5 GS/s. Use
interpolation when a lower waveform sample rate is needed.
Waveform interpolation Real time interpolation of IQ (complex) waveforms is supported independently on each
channel during play out.
Suppor
ted interpolation rates are 2x and 4x.
Only IQ (complex) waveforms can be interpolated. The interpolation factor refers to the
sample rate of the complex pair of points r elative to the global instrument sample rate
set by t
he clock. For example if the sample rate is s et to 5 GS/s and the interpolation
factor is 2, then the waveform sample rate of both I and Q samples is 2.5 GS/s. DDR
interpolation offers an additional doubling of the sample rate.
Inverse SINC fi lter Real time correction of the sinx/x frequency roll off can be enabled or disabled
indep
endently on each channel.
Table 4: Sequencer
Characteristics Description
Number of steps
16,384
14 address bits. Numbers are zero-0 based in HW (0 to -16383).
Maximum repeat count
1048576 (2
20
)
AWG5200 Series Technical Reference 3

Tektronix AWG5204 Specifications

General

Brand	Tektronix
Model	AWG5204
Category	Portable Generator
Language	English