Patent Number: 7,613,239

Title: Digital signal offset adjusting apparatus and pulse pattern generator using the same

Abstract: A digital signal offset adjusting apparatus has a capacitor causing an output terminal to pass a high frequency band of an input digital signal. A first coil has one end connected to an input terminal and a second coil has one end connected to an output. An operational amplifier has an input connected to another end of the first coil, a second input connected to a direct current voltage generator and an output connected to another end of the second coil. The operational amplifier outputs a signal obtained by subtracting and combining the low frequency band, the direct current component and a direct current bias voltage. A frequency characteristic compensating circuit is connected between a reference point and the second input of the operational amplifier. The gain of the operational amplifier increases with a component having a higher frequency from among low frequency bands of the input digital signal.

Inventors: Shiratsuchi; Satoru (Atsugi, JP), Fujinuma; Kazuhiro (Ebina, JP), Saito; Sumio (Atsugi, JP)

Assignee: Anritsu Corporation

International Classification: H03K 7/04 (20060101)

Expiration Date: 1/03/02017