PTB & PTM-84B Series
8-BIT DIGITAL PHASE SHIFTER
100 to 500 MHz / 1.4 Phase Res. / Monotonic / Broadband, Switched Cable Design / BNC or SMA
PRINCIPAL SPECIFICATIONS
Calibration
Frequency,
f
c,
MHz
100 to 500
Usable
Bandwidth,
MHz
f
c
±
40%
SMA
Model
Number
BNC
Model
Number
GENERAL SPECIFICATIONS
Phase Shift:
Bit Count:
0° to 360° nom.@ f
c
8
PTM-84B-***B PTB-84B-***B
Least Significant Bit: 1.4°
Most Significant Bit: 180°
Accuracy at f
c
:
1/2 of LSB typ.
50
Ω
nom.
guaranteed monotonic
For complete Model Number replace *** with desired Calibration Frequency, f
c
in MHz.
General Notes:
1. Digital phase shifters in the PTM-84B series are controlled
directly by TTL and are available for frequencies from 100 to
500 MHz.
2. Each model provides 360° of phase shift at a selected
calibration frequency in 8 binary increments (255 steps)
resulting in 1.4° resolution.
3. Phase shift is based on propagation delay through precisely
calibrated cables. Selecting a specific phase shift is
accomplished by entering a digital word that in turn switches in
appropriate delay lines through fast-acting PIN diodes.
4. Advantages of the switched-line phase shifter over the
digitally controlled analog type include potential for higher
accuracy and smaller value of the Least Significant Bit (LSB).
5. Phase shifters based on switched cables are inherently stable
and well matched. Each bit can be set and held very closely in
binary increments from the LSB to the MSB (Most Significant
Bit).
Impedance:
VSWR:
Insertion Loss, I
L
:
Input Power:
Control Input:
Logic Sense:
Supply Power:
Settling Time:
Weight, nominal:
Operating Temp:
1.3:1 max.
2.5 dB nom., 4 dB max.
+10 dBm max.
8-Bit TTL
@ 2 loads max. per Bit
I
L
Variation vs. Cont:
±0.2
dB @ mid band
Positive
+5 VDC
@500 mA max.
+15 VDC
@150 mA max.
1
µs
max.
10 oz (285 g)
-- 55° to +85°C
Functional Schematic Diagram
26Apr96
F rf t e if r to c n a t
M ERRI AC /41 Faifel Pl,W estCal el,NJ,07006 / 973-
o ur h r n o ma in o t c
M
ri d .
dw l
575-
1300 /FAX 973- 0531
575-
MERRIMAC [ MERRIMAC INDUSTRIES, INC. ]
