Gilbert cell

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In electronics, the Gilbert cell is an electronic multiplying mixer first described by B. Gilbert in 1968. The output current of the circuit is an accurate multiplication of the (differential) base currents of both inputs.

A Gilbert cell can be used as:

  • A small signal precise four-quadrant multiplier(with condition that both inputs are small compared with VT(temperature constant=0.025)
  • A large signal phase detector(with condition that both inputs are great compared with VT)
  • A modulator in a communications application (with condition that only one input is small compared with VT while the other input is greater)
  • A pre-processing circuit in a Flash ADC to reduce the number of comparators in this architecture. This is called a folding ADC.

[edit] References

"A Precise Four-Quadrant Multiplier with Subnanosecond Response", Barrie Gilbert, IEEE Journal of Solid-State Circuits, Vol. 3, No. 4 (1968), pp. 365-373

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