CHM2378A Datasheet PDF - United Monolithic Semiconductors
| Part Number | CHM2378A | |
| Description | W-band Dual Channel Mixer | |
| Manufacturers | United Monolithic Semiconductors | |
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CHM2378a
W-band Dual Channel Mixer
GaAs Monolithic Microwave IC
Description
The CHM2378 is a dual channel mixer.
Each mixer cell is a balanced structure
based on a six quarter wave ring. The non-
linear devices are high quality Schottky
diodes providing low conversion loss and
very low 1/f noise.
This circuit is manufactured with the BES-
MMIC process: 1 µm Schottky diode
device, air bridges, via holes through the
substrate, stepper lithography.
It is available in chip form.
Main Features
n W-band LO and RF frequency range
n Low conversion loss
n IF from DC to 100MHz
n High LO/RF isolation
n High LO/AM noise rejection
n Very low 1/f noise
n Low LO input power
n Automatic assembly oriented
n Chip size: 1.98 x 2.07 x 0.10 mm
Main Characteristics
Tamb. = 25°C
RF1
LO
RF2
IF2 IF1
Dual channel mixer block diagram
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
75 75,5 76 76,5 77 77,5
LO frequency (GHz)
Typical conversion characteristic
LO power = 8dBm ; IF=10MHz
(measurement in test fixture)
Symbol
F_lo, F_rf
F_if
Lc
I_lo/rf
N_if
Parameter
LO,RF frequency
IF frequency range
Conversion loss
LO/RF isolation
IF noise @ 100kHz
Min
76
DC-100
Typ
76.5
7.5
25
-162
Max
77
9.5
Unit
GHz
MHz
dB
dB
dBm/Hz
ESD Protection : Electrostatic discharge sensitive device. Observe handling precautions !
78
Ref. : DSCHM23781269 -26-Sep.-01
1/8 Specifications subject to change without notice
United Monolithic Semiconductors S.A.S.
Route Départementale 128 - B.P.46 - 91401 Orsay Cedex France
Tel. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
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W-band Dual Channel Mixer
CHM2378a
External components for bias and IF
Several external configurations are possible for bias and IF. The objective is to give flexibility
for the integration.
As this component is mainly dedicated to low IF use, there are several possibilities for
interfacing with low noise IF amplifier. The optimum IF load for conversion loss is 200Ω,
however the best results on noise figure have been obtained on 50Ω. Depending on the IF
amplifier noise characteristic this load can be modified in order to optimise the noise figure..
A series capacitor, between IF output and the load is recommended.
Due to high sensitivity to electrical discharges an integrated resistance is used and two ports
are available for biasing each mixer. One is for the connection of a decoupling capacitor (C1,
C2) and the other one is for the supply voltage connection through an external series
resistance (+V1, +V2). However, if necessary only the “C1, C2” ports can be used.
C1 V1
1k
LO
IF1
RF1
RF2
+V R_load_IF
R_bias
C1 V1
C_IF
IF1
1k
LO
RF1
RF2
1k
C2 V2
IF2
1k
C2 V2
R_bias
IF2
C_IF
Block diagram of the MMIC
+V R_load_IF
Recommended IF/DC external configuration
The recommended values for external components are:
C1,C2
R_bias_t*C >> 1/F_if
R_bias_t
2.5kΩ for 1.5mA current consumption (V = 4.5V, typical LO
power)
R_load_if
From 50 to 200Ω
Notes::
1. R_bias_t = R_bias + 1kΩ when V1 and V2 ports are used.
2. R_bias_t can be adjusted if necessary; This allows to optimise the performances when some
parameters are different from recommended (Supply voltage, LO power …). However
maximum ratings for the current have to be taken into account.
3. A series capacitor at IF outputs is recommended for DC decoupling.
Ref. DSCHM23781269 -26-Sep.-01
5/8 Specifications subject to change without notice
Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for CHM2378A electronic component. |
| Information | Total 8 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ CHM2378A.PDF Datasheet ] | |
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