发明名称 |
Charge pump using dynamic charge balance compensation circuit and method of operation |
摘要 |
A charge pump comprises a first current mirror that injects a first charging current onto a loop filter and a second charging current onto an integrator capacitor. The first and second charging currents are controlled by a first common control signal. The first charging current mirrors the second charging current. A second current mirror drains a first discharging current from the loop filter and a second discharging current from the integrator capacitor. The first and second discharging currents are controlled by a second common control signal. The first discharging current mirrors the second discharging current. A sampling circuit couples the second charging and discharging currents to the integrator capacitor, which charges or discharges with a difference current between the second charging and discharging currents. A control circuit detects a voltage difference between the loop filter and integrator capacitor and adjusts the first common control signal to minimize the voltage difference.
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申请公布号 |
US6664829(B1) |
申请公布日期 |
2003.12.16 |
申请号 |
US20020234633 |
申请日期 |
2002.09.04 |
申请人 |
NATIONAL SEMICONDUCTOR CORPORATION |
发明人 |
HUGHES RODNEY A. |
分类号 |
H03L7/089;H03L7/18;(IPC1-7):H03L7/06 |
主分类号 |
H03L7/089 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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