"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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
✈ Downloads
✈ Input Matching : S11
-20 dB up to more than 3 GHz ... that is awesome !
✈ Output : Waveform
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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