公开(公告)号：CA2204476C

公开(公告)日：2000-09-12

申请号：CA2204476

申请日：1997-05-05

Applicant: ATI TECHNOLOGIES INC

Inventor： CHOW HUGH

IPC: H03L7/089 ,  H03L7/093

Abstract: A charge pump comprising a first branch PMOS FET having a source connected to a voltage source and a drain connected to an output node, a second branch NMOS FET having a drain connected to the output node and a source connected to a ground node, first apparatus for selectively switching a gate of the PMOS FET between its source and a first bias voltage source, and second apparatus for selectively switching a gate of the NMOS FET between its source and a second bias voltage source, the bias voltages being of magnitudes such that the first branch PMOS FET and second branch NMOS FET will source and sink the same magnitude of current when the FETs are fully conducting.

公开(公告)号：CA2204476A1

公开(公告)日：1997-12-20

申请号：CA2204476

申请日：1997-05-05

Applicant: ATI TECHNOLOGIES INC

Inventor： CHOW HUGH

IPC: H03L7/089 ,  H03L7/093

公开(公告)号：CA2214221C

公开(公告)日：2000-06-06

申请号：CA2214221

申请日：1997-08-28

Applicant: ATI TECHNOLOGIES INC

Inventor： CHOW HUGH ,  AHDAB AHMAD ,  CHAU RAYMOND

IPC: H03K3/03 ,  H03L7/099

Abstract: A voltage controlled oscillator comprising: a ring of inverters comprised of an odd number of serially connected CMOS inverter stages, the inverter stages being connected between first and second oppositely poled power leads, a MOSFET having a source-drain circuit connected between one of the power leads and a first power rail, the other power lead being connected to a second power rail, apparatus for operating the MOSFET in saturation, and apparatus for applying a control voltage to the gate of the MOSFET, referenced to the second power lead, whereby the MOSFET operates as a nonlinear current conduction device having a characteristic such as to linearize the voltage-frequency characteristic of the combined MOSFET - ring oscillator combination.

公开(公告)号：CA2214221A1

公开(公告)日：1998-08-24

申请号：CA2214221

申请日：1997-08-28

Applicant: ATI TECHNOLOGIES INC

Inventor： AHDAB AHMAD ,  CHOW HUGH ,  CHAU RAYMOND

IPC: H03K3/03 ,  H03L7/099

Abstract: A voltage controlled oscillator comprising: a ring of inverters comprised of an odd number of serially connected CMOS inverter stages, the inverter stages being connected between first and second oppositely poled power leads, a MOSFET having a source-drain circuit connected between one of the power leads and a first power rail, the other power lead being connected to a second power rail, apparatus for operating the MOSFET in saturation, and apparatus for applying a control voltage to the gate of the MOSFET, referenced to the second power lead, whereby the MOSFET operates as a nonlinear current conduction device having a characteristic such as to linearize the voltage-frequency characteristic of the combined MOSFET-ring oscillator combination.