PTB & PTM-84A Series
8-BIT DIGITAL PHASE SHIFTER
20 to 100 MHz / 1.4 Phase Resol. / Monotonic / Broadband, Switched Cable Design / BNC or SMA
PRINCIPAL SPECIFICATIONS
Calibration
Frequency,
f
c,
MHz
20 to 100
Usable
Bandwidth
f
c
±
40%
SMA
Model
Number
PTM-84A-**B
BNC
Model
Number
PTB-84A-**B
GENERAL SPECIFICATIONS
Phase Shift Range:
Least Significant Bit:
Most Significant Bit :
Accuracy at, f
c
:
0° to 360° nom. @ f
c
1.4°
180°
1/2 of LSB typ.
guaranteed monotonic
For complete model number replace ** with desired calibration frequency, f
c
in MHz.
General Notes:
1. PTB- & PTM-84A series phase shifters provide up to 360° of phase shift at a
selected calibration frequency in 8 binary increments (255 steps) resulting in 1.4°
resolution. Each step is generated with different cable lengths switched with PIN
diodes. 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).
2. Phase shifters based on cable switching are inherently stable and well
matched. Phase shift can be set and held very closely in binary increments from
the LSB to the MSB (Most Significant Bit).
3. This series can be calibrated up to 100 MHz and used to 180 MHz while the
related PTM-84B series extends coverage to 500 MHz.
Impedance:
50
Ω
nom.
VSWR:
1.3:1 max.
2.5 dB nom., 4 dB max.
Insertion Loss, I
L
:
I
L
, Variation vs. Cont:
±0.2
dB @ mid band
Max. Input Power:
+10 dBm
Control Input:
8 Bit TTL
@ 2 loads max. per Bit
Logic Sense:
Supply Power:
Settling Time:
Weight, nominal:
Operating Temp:
Positive
4
µs
max.
10 oz (285 g)
-- 55° to +85°C
+5 VDC@250 mA max.
Functional Schematic Diagram
24May96
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 973 575-
0531
MERRIMAC [ MERRIMAC INDUSTRIES, INC. ]
