G.T. Microwave Features:
Frequency Ranges: From 500 MHz to
24 GHz any optimized bandwidth is available.
TTL Compatible Logic: G.T.M.I.'s
binary logic Digital to Analog Converter with 8 inputs;
Logic '1'/BIT = 256 discrete phase shifts with a 1.4
degree Resolution (L.S.B.) or all Logic '0' = 0 degrees
Reference state. Up to 12 BIT resolution available
Optional Models: Analog Voltage controlled
models. Dual function models, selectable input for
either translator or phase shifter operations.
High Speed Switching: Frequency
Translators listed are measured from any set value
to any value.
Translation Rate: From 0 to 500
kHz the Carrier Suppression is 25 dB and Sideband
Suppression is 20 dB Minimum.
Low DC power Consumption: Frequency
Translators require +/=12 to +/=15 VDC @ +/-100 mA.
Stable Phase Shifts: Variation vs
Temperature from -55° to 85°C is typically
±0.2° /° C from set value. Temperature
Compensated models are available upon request.
High RF Power Handling: For power
levels greater than listed, please consult factory.
Standard Interfaces: RF Port connectors
are ‘SMA’, female per MIL –C-39012.
Life Time Integrity: G.T.M.I.’s
Translators are designed to meet MIL – E
– 16400, Range 1 and MIL – E – 5400,
Class 2 environments operating within the -55°
to +85° C temperature range.
here to view Outline Diagram
G.T.Microwave's Digital Frequency Translators/Phase
Shifters are used for changing the fundamental
frequency of incoming signals. frequency translation
is defined as the transfer of signals occupying a
specified frequency band, such as a channel or group
of channels, from one portion of the frequency spectrum
to another, in such a way that the arithmetic frequency
difference of signals within the band is unaltered.
When the phase shifter is used as a frequency
translator, the translation rate is determined by
dividing the clock rate by the number of steps.
A signal-processing technique using a linear time-
varying phase shifter is one method of frequency translation.
One principal use is in velocity deception for Electronic
Countermeasures System by providing false
Doppler radar returns. In a true Doppler radar situation,
the reflected signal (no harmonics or spurious signal)
is translated in frequency in an amount proportional
to the radial velocity of the target. However spurious
signals may be present in the radar return if the
target is using velocity-deception techniques because
of the non ideal performance of the frequency
translator. The presence of these spurious
signals will reveal that the Doppler radar is being
jammed. Therefore, it is critical for optimum Electronic
Countermeasures System performance that the frequency
translator suppress the carrier, harmonics, and all
PM/AM Error is the maximum change
from crest-to-crest in insertion loss of the phase
shifter as the phase is rotated over a 360-degree
phase range. The amplitude change (AM) being a function
of the phase change (PM).
PM Error: 0-200 KHz, 1 dB
AM Error: 200-500 KHz, 3 dB
Phase Nonlinearity is the lack of
direct proportionality to the ratio of phase shift
to frequency over a specified frequency range, which
can be calculated through the deviation of the linear
phase shift and time.
Phase Nonlinearity: 5 degrees
Although Quantization Error is insignificant
at a phase resolution greater than 6 BITs, it appears
in a digital phase shifter, which only estimates the
linear phase shift with isolated phase steps.
Flyback Time is the limited time
allocated by the phase shifter to go back from 360
to 0 degrees.
Flyback Time: <1% of the translation rate
For substantial improvement
in performance; ask for OPTIMIZED NARROWBAND models.
G.T. Microwave Inc. 1-973-361-5700 fax: 1-973-361-5722