Title:
【発明の名称】発振器回路
Document Type and Number:
Japanese Patent JP2003533115
Kind Code:
A
Abstract:
An oscillator circuit (300) comprising: a resonator (Q) connected between an input (IN)and an output (OUT); an inverter having first and second driver transistors (MP, MN) connected in series via an output-coupled node; first and second biasing transistors (MPD, MND) for biasing the driver transistors; and first and second limiting means between the gate electrodes of the driver transistors respectively and the output. The CMOS circuit allows regulation of the oscillation amplitude without need for well-controlled DC current sources to polarize correctly the driver transistors, and without need for a start-up circuit to ensure that both driver transistors remain in saturation when the circuit is powered on. A simple oscillator circuit (600) has an inverter whose input is capacitively coupled to the input (IN), first limiting means coupled between the inverter input and the output (OUT), and second limiting means coupled between the input (IN) and the output (OUT).
Inventors:
Rasunak, Andreas
Application Number:
JP2001582905A
Publication Date:
November 05, 2003
Filing Date:
May 11, 2001
Export Citation:
Assignee:
MOTOROLA INCORPORATED
International Classes:
H03B5/36; H03B5/30; (IPC1-7): H03B5/30
Domestic Patent References:
| JPS5752206A | 1982-03-27 | |||
| JPS5553906A | 1980-04-19 | |||
| JPS5230146A | 1977-03-07 | |||
| JPH07154146A | 1995-06-16 |
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)