Patent ID: 7415256
Filing Date: 2008-08-19
Classification: G01N,H04B

Abstract:
1. A received signal strength measurement circuit comprising: an IF amplifier section, which includes multiple stages of serially connected differential amplifiers for amplifying, with use of a first current source provided as a power source for amplification, an IF signal corresponding to a received signal; a voltage-current conversion section for converting into current a voltage amplitude of an absolute value signal outputted from the differential amplifier of each stage of the IF amplifier section, using a second current source provided as a power source for conversion, and adding and outputting the converted current; and a voltage output section for converting into voltage the output current from the voltage-current conversion section, and outputting the converted voltage as a measurement voltage value, the voltage-current conversion section being set so that a current value of the voltage-current conversion is inversely proportional to absolute temperature.