| 摘要 |
An RF envelope detection circuit that operations at low currents, high sensitivity, and high dynamic range. The circuit receives an AC signal at its input terminal and applies a signal on its output terminal that is a function of the envelope magnitude of the AC signal. To do so, a current source provides a current with an AC signal being superimposed thereon. A rectification circuit rectifies the AC component of this current. A voltage amplifier then amplifies the voltage for providing on the output terminal of the detection circuit. A current sink draws a current from the output terminal that has approximately the same magnitude as the current provided by the current source. A capacitor is coupled to the output terminal of the rectifier so as to store excess charge provided by the rectifier that is in excess of the magnitude of the current provided by the current source.
|
