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Mixer-NE612.php    6812 Bytes    16-11-2022 14:39:42

MIXER - The NE612 Tinkerboard

Some kind of evaluation board


 typ. - 4 dBm max. + 7 dBm variable
 0.5 - 1000 MHz 0.5 - 1000 MHz some kHz

✈ The Workhorse : NE/SA 602/612

NE612 Evaluation Board

The Gilbert Cell, inside. Drawing courtesy of NXP Semiconductor.

"The SA612A is a low-power VHF monolithic double-balanced mixer with on-board oscillator and voltage regulator. It is intended for low cost, low-power communication systems with signal frequencies to 500 MHz and local oscillator frequencies as high as 200 MHz. The mixer is a ‘Gilbert cell’ multiplier configuration that provides gain of 14 dB or more at 45 MHz." Says the datasheet from NXP.

As it is a low-power device, inputs and outputs have a high impedance. Therefore, a direct connection to a 50 Ω-System needs matching circuits. Matching circuits are often narrowband.

That's why we build this broadband resistively matched board. It allows for easy intefacing with the "Standard" impedance of 50 Ω. The onboard oscillator circuit is not used, here. Instead, an external LO must be supplied.

✈ Downloads

✈ Conversion Gain, 250 MHz + 250.001 MHz ➔ 1 kHz

NE612 Conversion Gain

Horizontal : RF-Level [dBm], Vertical : IF-Level [mVpp]. LO-Level was -4 dBm.

✈ Frequency Response, LO, RF ➔ 1 kHz

NE612 Frequency Response

Horizontal : RF, LO Frequency [MHz], Vertical : IF-Level [mVpp].
LO-Level was -4 dBm, RF-Level -4 dBm (blue) and -34 dBm (orange).

✈ LO - RF - Isolation

NE612 LO - RF - Isolation

Horizontal : RF, LO Frequency [MHz], Vertical : LO - Breakthrough [dBm] @ RF Port
LO-Level was -4 dBm.

✈ Share your thoughts

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t1 = 6584 d

t2 = 281 ms

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