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FA_17GHz_PRESCALER.php   14831 Bytes    16-07-2014 00:19:43


DIY 17 GHz Prescaler 1000:1


Prescaler up to 17 GHz with an HMC494 and a ADF4113



  INPUT FREQUENCY
  5 MHz ... 17 GHz
  DIVIDE BY
  1000
  INPUT LEVEL
  - 10 dBm ... + 10 dBm
  OUTPUT LEVEL
  TTL
  POWER / CONSUMPTION
  8 ... 24 V (DC), 120 mA
  CASE
  55 mm x 24 mm x 80 mm

The ideal companion for the 10:1-Vorteiler bis 500 MHz.



17 GHz Prescaler :1000


This Prescaler is a handy Accessories to extend the Frequency Range of almost any Counter to 17 GHz. The Use of a HMC494 (Prescaler) in alliance with a ADF4113HV (PLL Circuit) and a ATTINY45/85-20PU allows a division rate of 1000. Easy Reading assured !



✈ Circuit Description




The first stage is a HMC494 which divides the input signal by 8. It can handle a power range from approx. - 10 dBm up to + 10 dBm. It has an 50 Ω termination inside. No protection was foreseen in order not to disturb the input impedance.

The next stage is a PLL-IC (ADF4113HV) which is cheap and has the the ability to output the RF_IN divided by the Prescaler/Counter-value, which is set by an ATTINY45/85-20PU to 125.

17 GHz Prescaler :1000



✈ Output




The output of the pll-ic has TTL-level. It is decoupled via a 100 Ω resistor.
Left: 1GHz/1MHz, right: 17GHz/17MHz. Level was + 5 dBm.

17 GHz Prescaler :1000 17 GHz Prescaler :1000



✈ Power Consumption




As with any high frequency circuit, the power consumption is 'high'. The Hittite HMC494 consumes approx. 103 mA at 5 V supply. Therefore, the pcb may be equipped with a switched regulator (TSR1-2450) as well as a linear regulator (good old 7805).



✈ Drawbacks




Amplifiers with high gain tend to oscillate. So does the pll-circuit. If no rf signal is present at the input, an internal amplifier oscillates at about 14 MHz.



✈ Printed Circuit Board




The PCB (printed circuit board) is made of FR4, 1.5 mm double sided. We know, that FR4 has an increasing attenuation above 3 GHz, that is why we kept traces as short as possible. The increasing attenuation compensates for the reduced maximum power of the first prescaler.

17 GHz Prescaler :1000

17 GHz Prescaler :1000 17 GHz Prescaler :1000 17 GHz Prescaler :1000 17 GHz Prescaler :1000



✈ BOM • Partlist




Other parts may be used as well. This is just a proposal.


Part
Value
Size
Distributor • Partnumber • Remarks

C1,C2

100pF

0402

Farnell, 2210761

C3

100pF

0603

Farnell, 1885421

C4,C20

10µF

0603

Farnell, 1657928

C5,C6

1nF

0402

Farnell, 2280640

C8,C15

100nF

0603

Farnell, 1740614

C10

10µF

1206

Farnell, 2094044

C11

1µF

0603

Farnell, 1867951

C12,C13,C14

47pF

0603

Farnell, 7568380

C16

no have

1206

-

C18

100µF

RM 2.54

Farnell, 8126240

C19

4.7µF

RM 2.0

Farnell, 1144602

D1

1N4007

DO-41

Farnell, 2323101

D2

LED, green

3 mm

Farnell, 3mm, green

Filter1

no have

1206

-

IC1

ATTINY45/85

DIL-8

Farnell, 1288352

IC2

HMC494LP3

QFN20(3X3)

Hittite

IC4

TSR1-2450

TO-220

Farnell, 1696320 or Farnell, 1831821

K1

no have

Mini-USB

-

K2

BNC

BNC

Farnell, 1231941

K3

SMA

SMA

Farnell, 2144527

K5

K2x3

K2x3

(for ISP)

MP1

no have

-

-

PLL1

ADF4113HV

TSSOP16

Farnell, 1498707

R1

1kΩ

1206

Farnell, 1576629

R2

1kΩ

0603

Farnell, 1576283

R3

100Ω

0805

Farnell, 2078948

R4

10kΩ

DO-41

Farnell, 9622187




17 GHz Prescaler :1000



✈ Notes




In case you mayst need a programmeable prescaler (up to 18 GHz), you may kindly consider the remarkeable work of Dr. Thomas Baier, DG8SAQ and Andreas Zimmermann, DH7AZ : "Variabel einstellbarer Vorteiler bis 18 GHz mit ADF41020", published in Funkamateur, 12/2015, p. 1293. In case you are interested on the subject "Urheberrecht im Internet" the same edition has an interesting article by Niels Gründel.




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t1 = 3910 d

t2 = 858 ms

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