Semiconductor circuit for wireless receiving provided with controller circuit for controlling bias current

Abstract

The invention relates to a wireless receiving semiconductor circuit and a wireless receiving device having the semiconductor circuit, wherein, the wireless receiving circuit (20) outputs the medium-frequency signal to a rear image and sound signal processing circuit after converting a wireless receiving signal received by an antenna (50) into the medium-frequency signal. A constant voltage source (8) supplies a bias current to the wireless receiver circuit (20). A bias current detector circuit detects the bias current, and outputs a detection result to a current controller circuit (4). The current controller circuit (4) outputs the detection result of the bias current to a memory circuit (2). The current controller circuit (4) controls the bias current detector circuit (3) to stop operating thereof, and then controls the bias current to decrease when the detected bias current is larger than a predetermined first threshold value and controls the bias current to increase when the detected bias current is smaller than a second threshold value smaller than the first threshold value, based on the detection result stored in the memory circuit (2).

Description

technical field [0001] The present invention relates to a semiconductor circuit for radio reception mounted on a mobile phone and the like, and a radio reception device including the same. Background technique [0002] In recent years, portable devices such as battery-operated mobile phones have been equipped with various wireless receiving circuits, and there is an urgent need to significantly reduce the power consumption of wireless receiving circuits. However, the analog TV broadcast receiving circuit used in the prior art analog TV broadcast receiver often consumes more than hundreds of mW-1W of power, which is not suitable for battery-driven portable devices. For example, in a digital TV broadcast receiving circuit for portable devices that will be released in the future, a significantly lower power consumption than in the prior art is required, and the power consumption is required to be, for example, 100 mW or less. In recent years, in order to meet this requirem...

AI Technical Summary

Problems solved by technology

However, in the reception amplifiers described in Patent Documents 1 and 2 of the prior art, no countermeasures are taken against the above-mentioned dispersion of current consumption.

Furthermore, the receiving amplifying devices described in Patent Documents 1 and 2 cannot further reduce power consumption because the bias current control is always performed during the operation of the receiving amplifying device.

Images