Patent ID: 6897719
Filing Date: 2005-05-24
Classification: H03D

Abstract:
1. An amplitude demodulation circuit, comprising: a signal input for obtaining an amplitude-modulated signal; a first capacitor for obtaining a signal derived from the amplitude-modulated signal, said first capacitor having a first connection connected to ground, said first capacitor for supplying a first voltage being tapped off across said first capacitor; a first discharging apparatus connected in parallel with said first capacitor; a second capacitor for obtaining a signal derived from the amplitude-modulated signal, said second capacitor having a first connection connected to ground, said second capacitor for supplying a second voltage being tapped off across said second capacitor; a second discharging apparatus connected in parallel with said second capacitor; a device for alternately storing rectified successive half-cycles of the amplitude-modulated signal on said first capacitor and said second capacitor, said device coupling said first capacitor and said second capacitor to said signal input, and said device having a diode; a switch connected between said diode and said first capacitor and between said diode and said second capacitor, said switch having a first switch position for connecting said diode to said first capacitor and a second switch position for connecting said diode to said second capacitor; and an evaluation unit for comparing the first voltage and the second voltage and for supplying an amplitude-demodulated signal derived from the amplitude-modulated signal.