Mixer

Single ended mixer

Single ended mixer
  1. What is single ended mixer?
  2. What are the differences between single and double balanced mixers?
  3. What is the benefit of using single balanced mixer over an unbalanced one?
  4. What is single diode unbalanced mixer?

What is single ended mixer?

Single Ended Diode Mixer

Diplexer combines the input RF and LO signals by superimposing them to drive the diode. Diode is biased at DC voltage ( ), decoupled from RF and LO signal paths through a DC blocking capacitor( ). RF choke blocks the RF/LO signals entering into bias source.

What are the differences between single and double balanced mixers?

A single-balanced mixer has a pair of diodes, where one port (typically LO) has a balun that drives the diodes in a balanced configuration. A double-balanced mixer has balanced inputs on RF and LO ports and uses four diodes connected in a ring. Balancing the ports reduces unwanted mixer spurs and improves isolation.

What is the benefit of using single balanced mixer over an unbalanced one?

Following are the benefits of balanced RF mixer type over unbalanced single device mixer type: Rejection of spurious responses and intermodulation products. Better LO-to-RF, RF-to-IF, and LO-to-IF isolation. Rejection of AM noise in the LO as mentioned above.

What is single diode unbalanced mixer?

A single diode, or unbalanced, mixer is the simplest and oldest mixer topology. A single diode mixer is fundamentally a two-port device, with the RF and LO combined and fed into the diode, and the IF delivered on the other side of the diode. The schematic and time domain response of this topology is shown in Figure 2.

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