Panasonic Corporation

Kyoko Hirata

Toru Iwata

Osamu Shibata

Yoshiyuki Saito

Masayuki Toyama

Yukio Arima

Hiroshi Suenaga

Tsuyoshi Ebuchi

Tatsuo Okamoto

An object of the present invention is to realize reduction in an area of an output stage driver in an interface circuit that switches between two transmission systems. The interface circuit has two driver circuits and a drive control circuit that can switch between two driving systems that are a voltage driving system and a current driving system. The two driver circuits are connected to a power supply potential via the drive control circuit. Two input signals and inverted logic signals of the input signals are inputted via a selection circuit. According to a control signal inputted into the drive control circuit, the interface circuit switches between the voltage-driving type single-ended transmission system and current driving type differential transmission system.

Interface circuit that can switch between single-ended transmission and differential transmission

A PLL comprises a current-controlled oscillator () for generating an output clock signal based on a current signal generated based on a phase difference between a reference clock signal and a feedback clock signal, a current source (), and an initialization switch () for performing an open/close operation based on the initialization signal, the initialization switch being inserted in series to an input terminal of the current-controlled oscillator () and the current source ().

PLL circuit

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Osaka, Japan

Kyoko Hirata