Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Isao Imazeki

Tomoya Urushihara

Masaki Kanemaru

A polarity-switching amplifier circuit includes: a first amplifying transistor and a second amplifying transistor, a transformer which includes a primary winding and a secondary winding, and a polarity-switching controller. An unbalanced input signal is input to the first amplifying transistor and the second amplifying transistor. The transformer receives an output signal of the first amplifying transistor and an output signal of the second amplifying transistor as a balanced signal input to the primary winding, and outputs a signal from the secondary winding. The polarity-switching controller turns on one of the first amplifying transistor and the second amplifying transistor and turns off the other thereof.

Polarity-switching amplifier circuit

A receiving apparatus converges a gain to a target gain even when a fish bone effect signal is included having a low power period in which signal power decreases abruptly compared to average signal power. The receiving apparatus () receives a signal including the fish bone effect signal having the low power period (FBE signal period) in which signal power decreases abruptly compared to average signal power. A FBE detecting section () detects an FBE signal period of a low power period based on a gain error corresponding to a difference between target power and average signal power of the received signal of the adjusted gain. Further, the gain error correcting section () selects a lower value than 1 as a convergence coefficient in the FBE signal period of a low power period, multiplies the gain error with the selected convergence coefficient and corrects the gain error.

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Osaka, Japan

Isao Imazeki