Patent ID: 6122495
Filing Date: 2000-09-19
Classification: H03M,H04B

Abstract:
A device for digitizing a receiver signal strength indicator (RSSI) signal in a wireless transmission system having a transceiver which outputs a RSSI signal, the device for digitizing a RSSI signal comprising:a micro-controller comprising a controller and a counter, responsible for monitoring and controlling operations of the wireless transmission system and the device for digitizing a RSSI signal, wherein the counter receives a numeric control signal from the controller and generates a square wave whose duty cycle is proportional to the numeric control signal;a low-pass filter for filtering the square wave from the counter to obtain an approximate DC threshold voltage; anda comparator having two inputs connected to the RSSI signal and the threshold voltage, respectively, wherein the comparator generates a comparison signal coupled to the controller; whereinthe controller changes the numeric control signal to control the duty cycle of the square wave from a smallest value, wherein the numeric control signal represents the digitized RSSI signal when the threshold voltage is larger than the RSSI signal during a digitization process.