Thine Electronics, Inc.

Yuji Gendai

Yusuke Fujita

Shunichi Kubo

A reference current source includes a reference current path, a first output current path and a second output current path. The reference current path includes a diode-connected first transistor, a diode-connected second transistor, and a first resistor that are connected in series between a first fixed potential and a second fixed potential. The first output current path includes a third transistor having a gate connected to a gate of the second transistor, forming a current mirror together with the second transistor, and a second resistor interposed between the third transistor and the first fixed potential. The second output current path includes a voltage-current conversion circuit to which a potential of a third node between the third transistor and the second resistor in the first output current path is applied and through which a reference current flows.

Reference current source

A PLL circuit includes a phase comparator, a charge pump, a loop filter, a voltage-controlled oscillator, a frequency divider, a frequency difference determination unit, and an FV characteristics adjustment unit. The frequency difference determination unit determines whether or not a frequency difference between a feedback oscillation signal and an input signal is equal to or smaller than a threshold value. The FV characteristics adjustment unit selects a frequency band in the voltage-controlled oscillator and adjusts FV characteristics.

PLL circuit

A combined resistance circuitA includes a first circuitryA provided between a first endand a second end. This first circuitryA includes a resistor Rprovided between a node Nand a node N, a resistor Rprovided between the node Nand a node N, a resistor Rprovided between the node Nand a node N, a resistor Rprovided between the node Nand the node N, a resistor Rprovided between the node Nand the node N, a switch SWprovided in series to the resistor Rbetween the node Nand the node N, and a switch SWprovided in series to the resistor Rbetween the node Nand the node N. The node Nis connected to the first end and the node Nis connected to the second end.

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Tokyo, Japan

Yuji Gendai