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The name derives from the fact that the analog circuit of diodes originally used to implement this technique takes the shape of a ring: a diode ring. [2] The circuit is similar to a bridge rectifier , except that instead of the diodes facing left or right, they face clockwise or counterclockwise.
The essential characteristic of a mixer is that it produces a component in its output which is the product of the two input signals. Both active and passive circuits can realize mixers. Passive mixers use one or more diodes and rely on their nonlinear current–voltage relationship to provide the multiplying element. In a passive mixer, the ...
Multiplicative mixers have been implemented in many ways. The most popular are Gilbert cell mixers, diode mixers, diode ring mixers (ring modulation) and switching mixers. Diode mixers take advantage of the non-linearity of diode devices to produce the desired multiplication in the squared term. They are very inefficient as most of the power ...
Fessenden's heterodyne radio receiver circuit. The incoming radio frequency and local oscillator frequency mix in the crystal diode detector. In 1901, Reginald Fessenden demonstrated a direct-conversion receiver or beat receiver as a method of making continuous wave radiotelegraphy signals audible. [7]
This additional diode cell topology is typically used when a low distortion voltage-controlled amplifier (VCA) is required. This topology is rarely used in RF mixer/modulator applications for various reasons, one being that the linearity advantage of the top linearized cascode is minimal due to the near-square wave drive signals to these bases ...
The expression suggests a quadrature phase detector can be made by summing the outputs of two multipliers. The quadrature signals may be formed with phase shift networks. Two common implementations for multipliers are the double balanced diode mixer, diode ring and the four-quadrant multiplier, Gilbert cell.
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