The line thickness is due to left over RF. The modulated RF is 2 mv pp and the recovered audio is 1 mv pp. It is now easy for me to design and to tweak. The MMBTH81 is a PNP RF Transistor designed for general RF amplifier and mixer applications to 250mHz with collector currents in the 1 to 30mA range. It is a switching mixer) configured as a Class B amplifier. Well I am happy I now know how this mixer works. Class B operation) for the mixer requires adjustment of the LO amplitude or the bias resistors. As shown, the RF signal is applied at the gate of the device of RF port so. The above local oscillator (LO) is 1 MHz and 2v pp and the signal is 1.1 MHz and 200 mv pp. In this mixer the transistor of RF port always works in the saturation region. Need to look at the range of couple capacitors values that work. BIPOLAR TRANSISTOR AS AN OPTOELECTRONIC MIXER NUR AMIRAH SHAHARUDDIN 1, SEVIA MAHDALIZA IDRUS 2, NORLIZA MOHAMED 3, ABU BAKAR 4, SUHAILA ISAAK 5 Abstract. A 1 V, 1.9 GHz Mixer Using a Lateral Bipolar Transistor in CMOS Song Ye University of Toronto 10 King s College Road Toronto, Ontario, M5S 3G4, Canada 1-81 Koji Yano Yamanashi University Takeda-4, Kofu Yamanashi 400-8511, Japan 81-5 C. Now this is not right! Even with a uV signal?Īnd now it works (all that is required is a low pass filter to extract the 100 kHz signal).: Okay it is pretty clear that it is a Class B amplifier (an important observation!). After searching the Internet I did find a few circuits with component values and local oscillator power requirements that allowed me to digitise a schematic in order to look at the simulation:
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