Varactor Diode Industrial Preparedness Measures - Macon - Historic Paper

8/13/2019 Varactor Diode Industrial Preparedness Measures - Macon - Historic Paper

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UNCLASSIFIED

D 295 153ARMED SERVICES TECHNIC L INFOAON GENCY RLINGTON HALL ST TION

ARLINGTON 12 VIRGINIA

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UNCLASSIFIED


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NOTICE: When government or other dravings, speci-fications or other data are used for any purposeother than in connection with a definitely relatedgovernment procurement operation, the U. S.Government thereby incurs no responsibility nor anyobligation whatsoever; and the fact that the Govern-ment may have formflated, furnished, or in any wa ysupplied the said drawings, specifications, or otherdata is not to be regarded by implication or other-wise as in any manner licensing the holder or anyother person or corporation, or conveying any rightsor permission to manufacture, use or sell anypatented invention that may in any way be relatedthereto.


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C4 VARACTOR DIODE INDUSTR IAL PREPAREDNME SURES

10TH QU RTERLY PROCRESS REFC RT25 SEPTEMBER 1962 through 25 DECEMBER

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VARACTCR DIODE INDUSTRIAL PREPAREDNESSME SURES

IOTH QUARTERLY PROGRESS REPCRT25 SEPTEMBER 1962 through 25 DECEMBER 1962

Signal Corps Contract No. DA36-039 SC-85941Signal Corps Technical Requirements No. SCS-63

Dated 21 September 1959

Signal Corps Supply Agency225 South 18th StreetPhiladelphia 3, Pennsylvania

MICROWAVE ASSOCIATES, INC.Burlington, Massachusetts


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DA36-039 SC-85941 10th Quarterly Progress ReportMicrowave Associates, Inc 25 September 1962 through 5 December 1962

Distribution List

Commanding General 50U. S. Army Signal Supply Agency225 South 18th StreetPhiladelphia 3, Pennsylvania

Commanding OfficerU. S. Army Signal Equipment Support AgencyFort Monmouth, New JerseyAttentions SIGFM/ES-PFE-4


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SECTION I - PURPOSEThe purpose of this contract is the establishment of

a capability to mass-produce a variable capacitance microwavediode. This diode, known as a varactor diode , is a silicondiffused mesa device.

SECTION II - ABSTRACTA method of measuring the series resistance of a glass

Type III varactor diode is presented. A similar method has beenindependently developed elsewhere and is described in ef. 1.

The measurement is based on a determination of thetransmission loss due to inserting a diode in a shunt with atransmission line The transmission loss, maximized by seriestuning of the diode, is converted to series resistance in ohmsthrough use of a conversion graph.

SECTION III - PUBLICATIONS AND REPORTSNo publications connected with this contract were made

during the interval covered by this contract.

SECTION IV FACTUAL DATAA. Circuit Description - 1120 Mc Rs Measurement

A block diagram of the circuit used is shown in Fig. 1.The varactor holder (Fig. 3) is in he form of a tee having Type Ncoaxial connectors on two ends of an open rectangler box and

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another Type N connector on one side. The varactor is placedbetween the center conductor slabs and secured by nylon screws,

The detector circuit as shown in Fig. 2 is built in aGeneral Radio Insertion Unit. A Microwave Associates MA-3055circulator is used as an isolator before the detector.

The minimized signal level at the detector is a functionof the R. of the diode. Rs is thus seen to be determined in thistest by measuring the transmission loss. The reference level isset by replacing the diode with a short circuit and mthe transmission. This step is not very critically dependentupon the resistance of the short circuit or of the adjustableshort and is distinct from the measurement of the resistance ofthe adjustabe short,

The reflection loss of a varactor is determined bymeasuring the difference in decibels between the maximum signalsetting of the shorting stub tuner and the minimum signal settingof the tuner. The series resistance is then Jetermined from theformula

R25 Eq. (1)s = Loss (voltage ratio) -E

whereLoss (voltage ratio) = antiloglo down Eq. (2)

20A tubulation of Equation (1) db vs. Rs is supplied in Table I.and curves for these values are shown in Figs. 4, 5.

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The resistance of the sliding contacts of the adjustableshort circuit is determined from the apparent resistance valuemeasured for a slab short. The resistance of the sliding contactshould be subtracted to obtain the varactor resistance. This isa conservative porcedure since the presence of capacitive reactanceactually magnifies the effect of the resistance of the slidingcontacts,

B. OPERATION1. Set up apparatus as shown in Fig. 1 block diagram.2. Operate the HP Model 612A in accordance with in-

struction manual (Sec. II, Page 2-9, Para. 2-7) for operation withexternal modulation.

3. Set the Eico Model 377 Audio Oscillator at 1000cycles with the output selector on square wave modulation.

4. Adjust the HP 415B standing wave amplifier stepswitch to the 30 scale and turn the gain control full on to itsextreme clockwise position.

5. Adjust the frequency of the HP 612A signal gener-ator to 1120 Mc/sec.

6 Place a slab short in the varactor holder underthe nylon mounting screws.

7. Adjust the signal generator output attenuator andthe Microlab tuner until a signal is observed.

8. Maximize the signal through the Microlab tuner andlock. Slight adjustments of the modulation and output controls ofHP 612A may be necessary during tuning.

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9. Observe that adjusting the GR 874 DSO tuneableshort tunes the signal through a maximum and minimum. With thetuner at a maximum the output attenuator of the HP 612A shouldbe adjusted to give a full scale signal reading on the 30 dbstep of the HP 415B amplifier. Under these tuned conditionsthe output attenuator of the HP 612A should approximate a 25 dbvalue,

10, The kit is now ready for test use.

C. TEST PROCEDURE1. Secure diode in mount.2. Move short until a minimum is obtained on amplifier.

Switch steps when necessary to read minimum valuein terms of db change max. to min.

3. From chart of db vs Rs obtain series resistance value.4. Subtract Rs value of slab short from Rs in step 3

to obtain Rs value of diode.Ref. 1 5th Interim Report on Microwave Solid State

Devices - Contract DA36-039.-SC-85325 withBell Telephone Laboratories.

SECTION IV - PROGRAM FOR NEXT QUARTERIn the next quarter more work will be performed on the

measuring of cut-off frequency (Rs) of varactor diodes.

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SECTION VI - KEY PERSONNEL

1. D. Brewster 60

2. F. Kupriss 503. N. Prasinos 1004. D. Revelotis 240

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db db R1 223. 26 1.322 96.8 27 1.18

3 60.628 1.0 ,

4 1+2.8 29 0.93 32.2 30 0.826 25.0 31 0.73 20.5 32 0.648 16.6 33 0.5759 13.75 34 0.51

10 11.65 5 0.45511 9.88 36 0. 012 8.4 113 7.2614 6.2615 5.44116 4.7517 4.11+18 3.6319 3.1820 2.8021 2.4 822 2.1623 1.9221 1.6825 1.50

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Varactor Diode Industrial Preparedness Measures - Macon - Historic Paper

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