Harness, Dickey & Pierce, P.L.C.
Charge pump circuit, PLL circuit, and oscillator
There is configured a charge pump circuit for outputting a phase difference current to a first node, the charge pump circuit including a first current source coupled between a high potential power supply node and the first node, a second current source coupled between a low potential power supply node and the first node, a first switch coupled between the first current source and the first node, a second switch coupled between the second current source and the first node, a third switch coupled between the first current source and a second node, a fourth switch coupled between the second current source and the second node, a third current source for supplying a negative offset current to the first node, and a push-type differential amplifier circuit an input side of which is coupled to the first node, and an output side of which is coupled to the second node.
Seiko Epson Corporation
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Ryo Akio Hisahiro Yasunari
Ichikawa Tsutsumi Ito Furuya