GT Microwave
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  Frequency Translation Phase Shifter

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 upon request.

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 Frequency 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.

Click here to view Outline Diagram

POWER / LOGIC CONNECTIONS
No. of Bits Login Pin Assignments +15V
PIN
-15V
PIN
GND
PIN
8  L.S.B. @ 1 TO M.S.B. @ 8. PIN # 9 EXTERNAL CLOCK INPUT. Max. CLOCK FREQUENCY 10 MHz.
FOR HIGHER TRANSLATION RATES USE A LOWER NUMBER OF BITS.
Max. TRANSLATION RATE FOR 8 BITS IS 10 MHz/256 = 39 KHz.
13 14 15
ALL UN-USED PINS HAVE NO INTERNAL CONNECTIONS.
SIZE ‘A’DIM.
IN/CM

‘B’ DIM.
IN/CM

‘C’DIM.
IN/CM

‘D’ DIM.
IN/CM
1 4.95/12.57 3.38/8.58 4.750/12.065 3.125/7.938
2 3.25/8.26 3.25/8.26 3.050/7.747 3.000/7.620
3 3.00/7.62 3.00/7.62 2.800/7.112 2.750/6.985
4 4.25/10.80 3.50/8.89 3.250/8.255 3.250/8.255
Electrical Specifications for DIGITAL 360° FREQUENCY TRANSLATORS
G.T.M.I.’S Model Number FREQUENCY
RANGE
GHz

PHASE
ERROR

Vs

Freq.
MAX

Amplitude Translation Variation

INSERTION
LOSS
MAX
V.S.W.R
MAX
SWITCHING SPEED
nSEC MAX
RF Input POWER
+ dBm
CW / MAX
OutlineSize
T8P-39N-5 0.5-2.0 ±10.0°

1.0 dB to 200 kHz

or

3.0 dB to 500 kHz

13.0 dB 1.70:1 500 +10 +30 1
T8P -38N-5 1.0-3.0 +10 +30
T8P-48N-5 2.0-6.0 11.0dB 1.80:1 +15 +30 2
T8P-68N-5 6.0-18.0 12.0dB 1.90:1 +15 +30 3
T8P-84N-5 16.0-24.0 ±15.0° 16.0dB 2.20:1 +15 +30 4
T8P-69N-5 2.0-18.0 ±22.0° 16.0dB 2.20:1 +15 +30 4

Frequency Translations:
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 unwanted sidebands.

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