PCM-3 Series
PHASE COMPARATORS
10 to 500 MHz / High Signal Isolation / High Accuracy / SMA Connectors
PRINCIPAL SPECIFICATIONS
Model
Number
PCM-3-***B
Center
Frequency,
f
o,
MHz
10 - 500
Usable
Bandwidth,
MHz
f
o
±
5%
GENERAL SPECIFICATIONS
RF Characteristics:
Phase Difference Range: 0 - 360°
VSWR (RF/LO):
2.0:1 max.
LO Input Power (Ref.):
+10
±1
dBm
RF Input Power (Unknown): +2 dBm max.
Rise Time/Fall Time:
100 ns typ.
Impedance (Unknown & Ref.):50
Ω
nom.
Video Output Characteristics:
‘‘X’’ Output:
K Cos
θ
‘‘Y’’ Output:
K Sin
θ
Peak Amplitude (RF=0 dBm):150 mV min.
(into 150
Ω)
For complete Model Number replace *** with desired Center Frequency, fo in MHz.
Output Voltage as a Function of Relative Phase Angle
160
0
mV
-160
0°
90°
180°
270°
360°
Package Outline
Bandwidth:
DC-10% of RF
Impedance (X and Y):
150
Ω
nom.
Signal Leakage (Isolation): 30 dB typ.
Output Accuracy:
Amplitude Balance:
±
5 mV max.
Zero Crossing (In-Phase Inputs):± 1° @ f
o
Phase Error, Arc tan
θ:
±
5° @ f
o
Weight, nominal:
0.32 oz (9 g)
Operating Temperature:
-- 55 to +85°C
General Notes:
1. Merrimac Phase Comparators provide two output
signals each of which is proportional to the phase
relation of the two inputs.
2. One output is proportional to the sine of the
relative phase angle between the RF and LO inputs
while the other output represents the cosine of the
relative phase angle between the inputs. Using the
sine and cosine outputs together resolves the
inherent
π−period
ambiguity across four quadrants
for both outputs.
3. The phase comparator is an integrated assembly
consisting of a power divider, two balanced mixers
and a 90° quadrature hybrid. Two diplexers
attenuate the second harmonic (2 f
o
) at the outputs.
4. Custom designs are available that provide higher
precision and better accuracy. Inquiries concerning
your special applications are welcomed.
23Feb96
NOTES:
1. Tolerance on 3 place decimals
±
.020(.51) except as noted.
2. Dimensions in inches over millimeters.
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. ]
