Ampl.
Balance
0 dB
0.25
0.5
0.75
1.0
2.0
IMP-2 Series IMAGE REJECT MIXERS
10 to 3000 MHz / Image Rejection up to 30 dB / Internal Summing Quadrature / Hi-Rel Package
For further information contact MERRIMAC / 41 Fairfield Pl., West Caldwell, NJ, 07006 / 973-575-1300 / FAX 973-575-0531
General Notes:
1. Image Rejection Mixers are integrated networks composed of an in-phase power divider, two double balanced mixers and two 90°
quadrature hybrids. Their principal function is the separation of two signals closely spaced in the frequency domain in, for example, a
receiver’s IF stage.
2. An image is a spurious signal occurring in a receiver’s IF stage together with the real signal. Both result from the mixing process.
Normally, a passband filter selects the real signal while rejecting the image. However, when the frequency difference between the real
and image signals is relatively small, conventional bandpass filters are generally inadequate.
3. In an Image Reject Mixer, the image is separated from the real signal by vector subtraction. The resulting attenuation of the image
is usually expressed as the ‘‘Image Rejection Ratio’’ in dB. (See graph).
4. Several factors affect attainable image rejection. For example, image rejection is a function of bandwidth, the phase and amplitude
balances of the individual components chosen, mixer sensitivity and VSWR interaction among other factors. The graph allows estimating
attainable image rejection under the variables of phase error and amplitude imbalance.
5. Merrimac offers a wide range of Image Reject Mixers for numerous applications. All units are designed and built in accord with
applicable specifications. Designers are invited to work closely with Merrimac engineers to insure best results.
6. All Merrimac Image Reject Mixers comply with applicable sections of MIL-M-28837 and may be supplied screened for compliance
with additional specifications for military and space applications requiring the highest reliability.
GENERAL SPECIFICATIONS
(when used as a Down Converter)
RF/LO Input Characteristics
Impedance: 50 Ω nom.
VSWR: 1.5:1 max.
RF Power Level: 0 dBm nom.
LO Power Level: +10 dBm nom.
IF Bandwidth: up to an octave
RF Bandwidth: up to an octave
LO Bandwidth: 10%
Output Characteristics
Conversion Loss: 9 dB max.
Image Rejection: 25 dB min.
(For bandwidth as above)
Operating Temp: -- 55° to +85°C
PRINCIPAL SPECIFICATIONS
Model LO Center Bandwidth Outline
Number Freq., fo, MHz MHz Style
IMP-2S-***/ 10 - 1000 10% of foS
IMP-2U-***/ 1000 - 3000 10% of foU
Model Numbering Note
A complete model number shall be assigned upon
establishment of a full performance specification by the factory
in conjunction with the customer. The model number shall
include an indicator of the center frequency (f0) and a special
slash number to distinguish it from related units. The format of
model numbers is as above where *** = f0.
23Feb96
IMAGE REJECTION
Phase Error (degrees)
for a given Amplitude and Phase Balance
00.5 11.5 22.5
3
50
45
40
35
30
25
20
15
IMAGE REJECTION
Image
Rejection
Ratio
NOTES:
1. Tolerance on 3 place decimals ±.010(.25)
except as noted.
2. Dimensions in inches over millimeters.
3. Lead Dimensions apply only at body.
4. All unmarked pins are case ground.
5. Nominal Weight: 0.35 oz. (10 g).
NOTES:
1. Tolerance on 3 place decimals ±.010(.25)
except as noted.
2. Dimensions in inches over millimeters.
3. Dimensions marked with * apply only at body.
4. All unmarked pins are case ground.
5. Nominal Weight: 0.55 oz. (15.4 g).
IMP-2 Series IMAGE REJECT MIXERS
10 to 3000 MHz / Image Rejection up to 30 dB / Internal Summing Quadrature / Hi-Rel Package
For further information contact MERRIMAC / 41 Fairfield Pl., West Caldwell, NJ, 07006 / 201-575-1300 / FAX 201-575-0531
S-Package Outline
U-Package Outline
13Feb96
