CN0239: Broadband 6 GHz Active Mixer with a Glueless Local Oscillator Interface

CIRCUIT FUNCTION AND BENEFITS
The circuit shown in Figure 1 is a 10 MHz to 6 GHz wideband active mixer with a direct interface to a frequency synthesizer-based low phase noise local oscillator (LO).

This circuit offers an optimum solution that is attractive in wideband applications that require frequency conversion to higher or lower frequencies. The two-chip circuit covers a broad LO frequency range from 35 MHz to 4400 MHz. The LO interface is simple and glueless, eliminating the need for a balun, matching network, and LO buffer. In addition, the mixer bias adjust function allows optimization of IP3, noise figure, and supply current based on the application requirements or on the size of the input signal.

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