发明授权
- 专利标题: Voltage-and temperature-compensated RC oscillator circuit
- 专利标题(中): 电压和温度补偿RC振荡电路
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申请号: US11467475申请日: 2006-08-25
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公开(公告)号: US07439818B2公开(公告)日: 2008-10-21
- 发明人: Gregory Bakker
- 申请人: Gregory Bakker
- 申请人地址: US CA Mountain View
- 专利权人: Actel Corporation
- 当前专利权人: Actel Corporation
- 当前专利权人地址: US CA Mountain View
- 代理机构: Lewis and Roca LLP
- 主分类号: H03K3/26
- IPC分类号: H03K3/26 ; H03K3/02 ; H03K3/42 ; H03L1/00
摘要:
An integrated temperature-compensated RC oscillator circuit includes an inverter having an input and an output. An RC network is coupled between the inverter and a pair of comparators. A first comparator has an inverting input coupled to a first reference voltage, a non-inverting input coupled to the RC network, and an output. A second comparator has an inverting input coupled to the RC network, a non-inverting input coupled to a second reference voltage, and an output. A set-reset flip-flop has a set input coupled to the output of the first comparator, a reset input coupled to the output of the second comparator, and an output coupled to the input of the inverter. Differential amplifiers in the comparators each have a diode-connected p-channel MOS transistor controlling a mirrored p-channel MOS transistor whose channel width is less than that of the diode-connected p-channel current mirror transistor.