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Prescaler_HMC705LP4E.php    15388 Bytes    20-09-2023 14:28:44

Prescaler with the HMC705LP4E

0.1 - 6.5 GHz programmeable divider (N = 1 - 17)

Prescaler with the HMC705LP4E

The prototype, designed for our Cavity-Team

✈ The HMC705LP4E

"The HMC705LP4(E) is a low noise GaAs HBT programmable divider in a 4x4 mm leadless surface mount package. The divider can be programmed to divide by any number from N = 1 to N = 17 up to 6.5 GHz. The HMC705LP4E’s high frequency operation along with low phase noise floor is very useful in high performance fast settling synthesizer architectures." Says the datasheet. (Analog Devices)

As we used FR4, it is to be assumed, that the performance degrades above 3 GHz.

No protection circuit is foreseen. Think twice before using it - and RTFM !

And Delete, as with a lot of High Frequency Gadgets - this one is very Power-hungry. At 5 Volts, 200 mA are consumed !

✈ Setting the Prescaler Value

The Prescaler value is set by jumpers. No Jumper results in a HIGH voltage. A Jumper set results in a low voltage. Use this table for it :

 N S0 N0 N1 N2 DIV1 BYP

✈ Downloads

✈ Input Matching : S11

Prescaler with the HMC705LP4E

-20 dB up to more than 3 GHz ... that is awesome !

✈ Output : Waveform

800 MHz : 16
100 MHz : 2

The Waveform of the output as well as the Amplitude depends on the Division Ratio.

If that causes problems in your application, add a Divide by 2 at the output. This will then produce a 50% Duty Cycle for all Settings of N. Bandwidth of the used Scope is 100 MHz.

✈ Share your thoughts

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t1 = 6585 d

t2 = 210 ms

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