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

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.

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

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

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

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