Patent Number: 6,311,049

Title: Receiving signal strength indicator uses feed forward level detecting signal

Abstract: An intermediate-frequency signal is fed to a demodulated-signal processing circuit through a variable gain circuit, an active filter, and a limiter. An RSSI output signal responsive to a received signal level is obtained through a low-pass filter by detecting the output of each stage of the limiter at a detector and by summing the output of the detector at an adder. The linearity of the RSSI output signal responsive to the received signal level is improved by feeding, via a coefficient multiplier to the adder, the control signal of a level detector which detects the control signal of the variable gain circuit, which limits the signal input to the active filter.

Inventors: Yoshizawa; Atsushi (Kanagawa, JP)

Assignee: Sony Corporation

International Classification: H03G 3/30 (20060101); H04B 007/00 ()

Expiration Date: 10/30/2018