NASA Technical Reports Server (NTRS) 19920016853: A 1-W, 30-ghz, CPW Amplifier for ACTS Small Terminal Uplink

6 Pages·0.22 MB·English

by  NASA Technical Reports Server (NTRS)

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NASA Technical Memorandum 105671
, A l-W, 30-GHz, CPW Amplifier for ACTS
........ Sm all Terrain al Uplink
Susan R. Taub
National Aeronautics and Space Administration
Lewis Research Center ........................
Cleveland, Ohio ......
= , =
and
Rainee N. Simons ........
Sverdrup Technology, Inc_ ...... --_-i_i / _/ - --_ ..... i __-i 7_--
_ _ _Le__.is _R_es___qarc_h:Cent_qGrroup
Brook Park, Ohio
Prepared for the
Monolithic Microwave Integrated Circuit Space
, :: and Ground Applications Symposium -
cosponsored by the National Aeronautics and Space Administration .................
and the Jet Propulsion Laboratory .....
Pasadena, California, April 28-29, 1992
I%I/ A
N92-26096 .
(NASA-IM-I05671) A I-W, 30-GHz, CPW
A_PLIFIER FOR ACTS SMALL TERMINAL UPLINK
(NASA) 6 p
Unclas
G3/33 0091288
Post Coupler MMIC Carrier
A CPW-to-CPW post coupler is shown in figure 3. The A novel package, which consist of acarrier and housing, was
CPW's share acommon ground plane that has an aperture. The developed to mount the MMIC chips in the amplifier. The
coupler is formed by a metal post which passes through the carrier with housing isshown in figure 7. The carrier has CPW
aperture and contacts the strip conductors of the CPW. A pair interconnects and provides heat-sinking, tuning, and cascading
of wire located to the sides of the post, tie the CPW ground capabilities. The housing provides electrical isolation,
planes toacommon potential. The S-parameters for thecoupler mechanical protection, and a feed-through for biasing. Fig-
are shown in figure 4. The coupler works only marginally at ure 8shows the measured insertion and return loss of thecarrier
30 GHz, but shows excellent characteristics at 7GHz. Work is with a 50-_ microstrip line in place of the MMIC. After
being done, including computer simulations to better under- subtracting the losses due to the test fixture, the insertion loss
stand the behavior of this coupler. of the carrier is about 1.0 dB and the return loss is better than
15dB.
MMIC Chips
Two MMIC chips were used, athree-stage and asingle-stage
amplifier chip. The gain compression of the three-stage chip is Conclusions
shown in figure 5. A typical chip has a power output of
190 mW, gain of 23 dB, and efficiency of 30.2 percent. Typi- The paper presents two schemes for the assembly of a l-W,
cal characteristics for the single-stage chip are: power output 30-GHz MMIC amplifier for the ACTS small terminal. The
of 710 mW, gain of 4.2 dB, and efficiency of 24 percent. In characteristics of TI MMIC chips, the post coupler, and the
order to achieve the required 1W of output power, the MMIC carrier have been presented. Future work includes: character-
chips were cascaded. The cascading configuration isshown in izing the power divider/combiner, tuning the MMIC chips, and
figure 6. assembling the amplifier.
References
I. Saunicr, P._ and T_,erng, ll.O.: AIG:_As"InGa/X,, Ilctero'_lructures v.ith 2. Sim_ms, R.N.:. aml Taub, S.R.: A Flexible CPW Package fl_r a304";|1z
Doped Channels I'orI)iscrctc l)cvicc'_ andM,antflithic Arnplificrs. IEEE MMIC Amplifier. Pr,.:sent,..'d_lltheIEEE Topical Mcctirtg on Electrical
Tram,. Electron D_'viccs, vol. 3(1.Ocl. lt)gt,), pp. 2231-2235. P_.'rrormano.: of Eleclronic Packaging, Apr. 22-24, 1*)92,Tuscon, AZ.
NASA TM- 105630, 1992.
Rectangular
Via hole
wavegulde
oax,a, !
Power input -25 dBm
Power output 1 W
Center frequency 29.634 GHz
Bandwidth 29.1-30 GHz
Input connector 2.4 mm OS-50 CPW line _ \ -- Ti amplifier
chips
Output waveguide WR 28 on the
bottom side -/ /'_ Ground plane
Table 1: Amplifier requirements. Figure 1._Amplifier configuration.
Coaxial-to- /_- ,Port 1
wavegulde
output --\
fixture
_ Coaxial / I I_- Metal post
L__ 1 I
CPW--k/ ................................ ./]
_--'--- "riamplifier
chips on ,,",:::...._Z::.I...............................:.::::::'"
Coplanar / alumina
waveguide / carders ( _#" _ Port 2
power divide r.
on duroid --/ Figure 3._CPW-to-CPW post coupler.
(a) Alternate amplifier configuration.
0
-10
-20
_ -30
_ --4o
i
e- I I • I 1 1 1 L__L._
-- -50
(a)
0
-10
-20
o
-30
E I
-40 - I
C-92-02604 I I I I I I I I I I
-50
0.045 8 40.0
(b) Coax-to-CPW in-phase three-way radial nonplanar power Frequency, GHz
divider/combiner,
(b)
Figure 2. Figure 4.--Post coupler S-parameters.
ORIGINAL PAGE
BLACK AND WHITE PHOTOGRAPH
50 - 25 B
O Output power
40 - 20 - [] Efficlen/_cc,jy ,.-,,.._
E Linear gainJ
-29.8_Bm
o
-o _ 31 dB ('f
20 - R 10 W
o
/ /,_ 23 dBm
0 _ _ 30.2%
10 -- 5
Power I 3-Stage HEMT t 3-Stage HEMT I 1-Stage HEMT I Power
o- 0 ] r' ] divider I Amp _ Amp I Amp Icombiner
-25 -15 -5 1:3 I 50-100-250t_m J50-100-250t_m I 800_.m I 3:1
i Gain30dB I Gain23dB I Gain 4.2dB I
Input power, dBm
Figure 5.--Gain compression diagram of three-stage Figure 6.--MMIC combination scheme.
amplifier.
t
(a) Insertion loss.
c tn -10
-- -30 I I 1 I l I l I 1 I
29 30
Frequency, GHz ---_
C-92-02467
(b)Return loss.
Figure 7.--Carrier with housing. Figure 8.mMeasured Insertion lossand return lossofthe carder.
OI_TGINAIZ PAGE
BLACK AND WHITE PHOTOGRAPH
7
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1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED
1992 Technical Memorandum
4. TITLE AND SUBTITLE 5. FUNDING NUMBERS
A l-W, 30-GHz, CPW Amplifier for ACTS Small Terminal Uplink
WU-506-72-1E
6. AUTHOR(S)
Susan R. Taub and Rainee N. Simons
7. PERFORMING ORGANIZATION NAME(S) ANDADDRESS(ES) 8. PERFORMING ORGANIZATION
REPORT NUMBER
National Aeronautics and Space Administration
Lewis Research Center E-7037
Cleveland, Ohio 44135-3191
9. SPONSORING/MONITORING AGENCY NAMES(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING
AGENCY REPORT NUMBER
National Aeronautics and Space Administration
Washington, D.C. 20546-0001 NASA TM- 105671
11. SUPPLEMENTARY NOTES
Prepared for the Monolithic Microwave Integrated Circuit Space and Ground Applications Symposium cosponsored by the National
Aeronautics and Space Administration and the .let Propulsion Laboratory, Pasadena, California, April 28-29, 1992. Susan R. Taub,
NASA Lewis Research Center; Rainee N. Simons, Sverdrup Technology, Inc., Lewis Research Center Group, 2001 Aerospace Parkway,
Brook Park, Ohio 44142 (work funded under contract NAS3-25266). Responsible person, Susan R. Taub, [phone].
12a. DISTRIBUTION/AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE
Unclassified -Unlimited
Subject Category 33
13. ABSTRACT (Maximum 200 words)
This paper describes the progress to date of the development of a l-W, 30-GHz, coplanar waveguide (CPW) amplifier for
the Advanced Communication Technology Satellite (ACTS) Small Terminal Uplink. The amplifier is based on Texas
Instruments' monolithic microwave integrated circuit (MMIC) amplifiers; a three-stage, low-power amplifier and a single-
stage, high-power amplifier. The amplifiers have a power output of 190 mW and 0.710 W, gain of 23 and 4.2 dB, and
efficiencies of 30.2 and 24 percent for the three-stage and one-stage amplifiers, respectively. The chips are to be combined
via aCPW power divider/combiner circuit to yield the desired 1W of output power.
14. SUBJECT TERMS =15. NUMBER OF PAGES
6
Amplifier; Monolithic microwave integrated circuit ;16. PRICECODE
A02
17. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION 19. SECURrrY CLASSIFICATION 20. LIMITATION OF ABSTRACT
OF REPORT OF THIS PAGE OF ABSTRACT
Unclassified Unclassified Unclassified
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