Mixer is a very important device in superheterodyne receiver.
RF mixer is mainly used to convert RF power of one frequency into power of another frequency, which makes information processing easier and lower cost. In addition to generating a new frequency signal, other characteristics of the initial signal are maintained at the same time to realize reception or transmission.
Generally speaking, the three ports on the mixer are radio frequency (RF) port, local oscillator port (LO) and intermediate frequency port (if). The radio frequency (RF) port is used to apply high-frequency signals to realize down conversion, or to output high-frequency signals in the up converter. The local oscillator (LO) port is used to power on. LO signal is the strongest signal, and the RF path can be reversed to if path by turning on or off the diode in the switching mixer. In other words, the if port is used to filter the modified RF signal into an IF signal.
Pasternack has four types of mixers:
1) IQ mixer
Pe86x9006 (IQ RF mixer, 30 GHz ~ 38 GHz, replaceable 2.92mm)
2) Triple balanced mixer
Pe8654 (triple balanced mixer, 6 GHz ~ 18 GHz, SMA)
3) Double balanced mixer
Pe86x1017 (double balanced mixer, 10 MHz ~ 1.2 GHz SMA)
4) Waveguide conversion mixer
Pe13u1003 (waveguide conversion mixer, wr-19, 40 GHz ~ 60 GHz, U-Band)
The performance indexes of Pasternack mixer are (refer to pe86x1017)
Frequency conversion loss
1dB compression point
Local oscillator power
Port standing wave ratio
Intermediate frequency residual DC bias voltage.