Patent ID: 9628194
Date: 2017-04-18
CPC Classifications: H03F,H03L,H04B

Claim:
1. A burst-signal reception circuit that receives a differential signal of a burst signal input via a preamplifier, the burst-signal reception circuit comprising: a differential amplifier to which the differential signal is input via a capacitor; an average detection circuit that detects an average of a differential input signal to the differential amplifier; and a differential-offset cancel circuit that operates to cancel a DC voltage level difference of the differential input signal on the basis of an output signal of the average detection circuit, wherein an average detection speed of the average detection circuit is configured to be switched according to presence or absence of burst signal reception, and the average detection speed is switched to a high-speed side in a head portion of the burst signal and switched to a low-speed side in portions other than the head portion.